Instrument control system for power plant and cabinet equipment thereof

Abstract

The application provides an instrument control system for a power plant and a cabinet device thereof. The instrument control system comprises a distributed control system with a power supply bus and a power transmitter with a power receiving terminal, a grounding terminal and a signal output terminal, wherein the cabinet device comprises: an I / O module connected to the power supply bus and powered by the power supply bus, the I / O module having a signal input terminal capable of being connected to the signal output terminal to receive a current signal output by the power transmitter; and a circuit breaker having one end connected to the power supply bus and the other end connected to the power supply terminal, the power supply terminal being capable of being connected to the power receiving terminal, so that the power transmitter can access a power supply voltage provided by the power supply bus via the circuit breaker. The instrument control system for the power plant and the cabinet device thereof can eliminate the problem that the power transmitter cannot be normally started due to insufficient power during starting, and do not need to introduce additional power supply and cables and do not need to increase additional personnel operation.

Description

TECHNICAL FIELD

[0001] The present application relates to power plants applying an instrument control system, wherein the instrument control system comprises a distributed control system (also referred to as decentralized control system or distributed control system, and also can be simply referred to as DCS), and particularly relates to improved power supply technology or power supply mode for power transmitters in such instrument control system, and specifically relates to an instrument control system for power plants and its cabinet equipment. BACKGROUND

[0002] In modern power plants or nuclear power plants, distributed control systems have been widely introduced, which is a technology using computer technology to centrally monitor, operate, manage and decentralized control production processes. The distributed control system is neither a decentralized instrument control nor a centralized computer control system, but overcomes the defects of both and combines the advantages of both. The structure of the distributed control system is usually a distributed, branched tree structure. In an instrument control system applying such distributed system, at the bottom layer of the overall architecture, power transmitters are usually applied as field instruments, and above the field instrument layer, there is usually a layer called field cabinet equipment layer, in which cabinet equipment and I / O modules (also referred to as input / output modules or modules) are configured.

[0003] Among them, an I / O module that can be used in a distributed control system is a FUM card developed by Siemens. For example, various types of I / O modules such as FUM card can be associated with field instruments such as power transmitters downward to perform functions such as acquisition of field signals, parameters or data, or to realize control (typically, such as closed-loop control) of field instruments, and can be associated with devices such as programmable logic controllers at higher levels (such as operation layer with operation terminals) upward to support group control at higher levels, etc. In the application involving distributed control system, the power transmitters used as field instruments are also commonly referred to as local transmitters or local power transmitters. More specifically, one specific type of FUM card developed by Siemens is FUM230 card (i.e. an I / O module of a specific model FUM230), which can be used to receive analog signals in a distributed control system or an instrument control system containing a distributed control system, and also belongs to an existing type of I / O module. The FUM230 card has been widely used in the TELEPERM XP (abbreviated as TXP) system developed by Siemens, and the TXP system can be applied to power plants such as various large and medium-sized power plants.

[0004] In some existing instrument control systems for power plants, power transmitters are usually configured to be powered via I / O modules such as FUM230 cards. It is found through actual investigation that power transmitters powered in this way may fail to start normally. Further research shows that the reason why power transmitters fail to start normally is that the power provided by the I / O modules such as FUM230 cards may not be sufficient to provide the starting transient power required by the power transmitters to start.

[0005] Specifically, for example, the typical power supply power load of a commonly used power transmitter may be 3W or slightly less than 3W. The power supply current of the transmitter connected to the FUM230 card for power supply is usually limited to below 120mA by the current provided by the integrated circuit of the FUM230 card, and the power supply end voltage of the power transmitter may be about 22.5V due to factors such as line voltage drop. Therefore, the load power provided by the FUM230 card to the power transmitter may only reach about 2.7W (22.5V*0.12A=2.7W). Considering that the starting transient power of the power transmitter may be greater than the normal working load, the power transmitter may fail to start normally under the above power supply mode. The above problem is particularly evident when the I / O module such as the FUM230 card is overloaded or fully loaded.

[0006] Some solutions have been proposed in the prior art to solve the above problem, such as temporarily connecting a temporary DC power supply to the power supply terminal of the power transmitter when the power transmitter fails to start normally, so that the power transmitter can start. However, such a solution does not completely eliminate the problem that the power transmitter in the instrument control system including the distributed control system may fail to start normally, and the operation is more complicated because a temporary local cable is needed to connect the temporarily connected additional DC power supply.

[0007] Therefore, it is necessary to provide a new solution for powering the power transmitter in the instrument control system for power plants to at least partially solve the above problem. SUMMARY

[0008] The present application provides an instrument control system for power plants and a cabinet device thereof. The present application can at least solve the following problems: the power transmitter in the instrument control system for power plants in the prior art may fail to start normally due to insufficient power supply power load, and when the power transmitter fails to start normally, an additional temporary local cable needs to be connected to connect an additional DC power supply, so the operation is more complicated.

[0009] The present invention can at least achieve the following: avoid the problem of power transmitters in the instrumentation and control system of a power plant failing to start normally due to insufficient power at startup, safely and reliably ensure the normal startup of each power transmitter in the system, and basically without the need for additional personnel operation.

[0010] The present invention provides a cabinet device for an instrumentation and control system of a power plant, wherein the instrumentation and control system includes a distributed control system and a power transmitter, wherein the distributed control system has a power bus that provides a power supply voltage, and the power transmitter has a power receiving terminal, a grounding terminal, and a signal output terminal. The cabinet device is characterized in that:

[0011] an I / O module connected to the power bus to be powered by the power bus, the I / O module having a signal input terminal configured to be connectable to the signal output terminal to receive the current signal output by the power transmitter;

[0012] a power supply terminal configured to be connectable to the power receiving terminal; and

[0013] A circuit breaker, one end of the circuit breaker is connected to the power bus, and the other end is connected to the power supply terminal, so that the power transmitter can be connected to the power supply voltage via the circuit breaker.

[0014] According to this solution, it can be effectively ensured that the load power provided to the power transmitter will not have a power shortage problem, thereby reliably ensuring the normal startup of each power transmitter.

[0015] In one embodiment, the power supply voltage is 24V DC.

[0016] According to this solution, the original power supply voltage currently used in the instrumentation and control system of the power plant can be utilized via the circuit breaker to power the power transmitter without introducing an additional DC power supply.

[0017] In one embodiment, the circuit breaker is rated for at least 0.5 amperes.

[0018] According to this solution, compared with the prior art solution of supplying power via an I / O module (e.g., a FUM230 card), since the current limiting value is greatly improved, there will no longer be a problem of insufficient load power provided to the power transmitter due to the current limiting value being too low, causing the power transmitter to fail to start normally.

[0019] In one embodiment, the I / O module is a FUM230 module developed by Siemens, also known as a FUM230 card.

[0020] According to the scheme, for the part of the existing instrument control system and the cabinet therein applying the FUM230 card, the improvement and change of the power supply mode for the power transmitter will not cause any substantial impact on the functions of the elements in the instrument control system, such as the instrument function, the monitoring function, and the like, thus the above scheme can be more suitable for improving the existing instrument control system and the cabinet therein.

[0021] In an embodiment, the cabinet device is provided with a backboard and a plurality of circuit breaker bases, the backboard is provided with a plurality of slots connected to the power bus independently, the I / O module is inserted into one of the plurality of slots to be connected to the power bus, and the plurality of circuit breaker bases are connected to the power bus independently, and the circuit breaker is inserted into one of the plurality of circuit breaker bases to be connected to the power bus.

[0022] According to the scheme, not only can additional personnel operation be avoided due to the improvement and change of the power supply mode for the power transmitter, but also the replacement of the circuit breaker used for power supply corresponding to the change of the power transmitter in the instrument control system, such as configuration change, instrument change or arrangement position change, is very convenient.

[0023] The application also provides an instrument control system for a power plant, the instrument control system comprising a power transmitter and a distributed control system, the power transmitter having a power receiving terminal, a grounding terminal and a signal output terminal, and characterized in that the distributed control system comprises:

[0024] a cabinet device, the cabinet device having an I / O module, a power supply terminal and a circuit breaker, the I / O module having a signal input terminal, the signal input terminal being connected to the signal output terminal to receive the current signal output by the power transmitter, one end of the circuit breaker being connected to the power supply terminal, and the power supply terminal being further connected to the power receiving terminal;

[0025] a power bus, the power bus being provided with a power supply voltage, the power bus being connected to the I / O module on one side to supply power to the I / O module, and the power bus being connected to the other end of the circuit breaker on the other side to enable the power supply voltage to be connected to the power transmitter.

[0026] According to the scheme, the load power provided to the power transmitter can be effectively ensured not to be insufficient, thus the normal start of each power transmitter can be reliably ensured.

[0027] In one embodiment, the I / O module has a plurality of pairs of signal input terminals, the power transmitter has a pair of signal output terminals, and the instrument control system comprises:

[0028] a plurality of power transmitters;

[0029] a cable comprising a ground cable, a power supply cable and a pair of signal cables, one end of the ground cable is connected to the ground terminal and the other end is grounded, two ends of the power supply cable are connected to the power supply terminal and the power receiving terminal respectively, and a pair of signal output terminals of each power transmitter is connected to a pair of signal input terminals of the I / O module via a pair of signal cables.

[0030] According to the present scheme, the cable for connecting the power transmitter and the circuit breaker can adopt the cable originally used in the existing instrument control system for power plants, which makes it unnecessary to lay new cables at least to a great extent, which can improve the efficiency of the improvement of the instrument control system for power plants based on the existing instrument control system, save the investment of manpower and material resources and costs, and has a significant advantage. Moreover, after the configuration is adopted and implemented, personnel intervention is usually not required for specific operations before, during and after the power transmitter is started, and the circuit breaker or the cable does not need to be removed, which does not affect the operation of the entire system.

[0031] In one embodiment, the power supply voltage is 24 volts DC.

[0032] According to the present scheme, the power transmitter can be powered by the original power supply voltage in the instrument control system currently applied to the power plant via the circuit breaker, without introducing an additional DC power supply.

[0033] In one embodiment, the rated current of the circuit breaker is at least 0.5 amperes.

[0034] According to the present scheme, compared with the prior art scheme of supplying power via the FUM230 card, since the current limiting value is greatly improved, the problem that the power transmitter cannot be normally started due to insufficient load power provided to the power transmitter caused by too low current limiting value will not occur.

[0035] In one embodiment, the current signal is a current signal.

[0036] According to the present scheme, the improvement and change of the power supply mode for the power transmitter will not have any substantial impact on the functions originally played by the power transmitter in the instrument control system, such as instrument function and monitoring function.

[0037] In one embodiment, the cabinet device is provided with a backboard and a plurality of circuit breaker bases, the backboard is provided with a plurality of slots respectively connected to the power bus independently, the I / O module is inserted into one of the plurality of slots to be connected to the power bus, and the plurality of circuit breaker bases are respectively connected to the power bus independently, and the circuit breaker is inserted into one of the plurality of circuit breaker bases to be connected to the power bus.

[0038] According to the present solution, not only can additional personnel operation due to improvement and change of the power supply mode for the power transmitter be avoided, but also the replacement of the circuit breaker used for power supply corresponding to the change of the power transmitter in the instrument control system, such as configuration change, instrument change or arrangement position change, is very convenient.

[0039] In one embodiment, the I / O module is a module developed by Siemens Company, model FUM230, which can also be called FUM230 card.

[0040] As described above, according to the present solution, the existing instrument control system can be improved more appropriately.

[0041] The instrument control system for power plant and the cabinet device thereof provided by the present application can completely avoid the problem that the power transmitter in the instrument control system for power plant cannot be started normally due to insufficient power during starting, thereby safely and reliably ensuring the normal starting of each power transmitter in the system. In addition, in the process of supplying power to each power transmitter, the instrument control system for power plant and the cabinet device thereof provided by the present application do not need to introduce additional power supply and cables or only need to introduce very few additional cables, and can use the original power supply and cables of the system without increasing additional personnel operation. Once the solution according to the present application is adopted, the technical problem that the power transmitter cannot be started normally due to insufficient power during starting can be solved once and for all. BRIEF DESCRIPTION OF DRAWINGS

[0042] The following drawings are only intended to illustrate and explain the present application and do not limit the scope of the present application. Among them,

[0043] Figure 1 A schematic diagram of an exemplary configuration for supplying power to a single power transmitter in the instrument control system for power plant according to one preferred embodiment of the present application.

[0044] Figure 2 A schematic diagram of the instrument control system for power plant according to one preferred embodiment of the present application.

[0045] REFERENCE SIGNS:

[0046] 1 power transmitter

[0047] 11 power receiving terminal

[0048] 12 ground terminal

[0049] 13 positive signal output terminal

[0050] 14 negative signal output terminal

[0051] 2 FUM230 card

[0052] 21 positive signal input terminal

[0053] 22 negative signal input terminal

[0054] 3 circuit breaker

[0055] 31 power supply terminal

[0056] 32 circuit breaker ground terminal

[0057] 4 cable

[0058] 41 power supply cable

[0059] 42 ground cable

[0060] 43 positive signal cable

[0061] 44 negative signal cable

[0062] 5 cabinet device

[0063] 6 power bus DETAILED DESCRIPTION

[0064] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described with reference to the accompanying drawings.

[0065] The present application provides a cabinet device for an instrument control system of a power plant and an instrument control system for a power plant, through an improved power supply configuration or architecture for supplying power to a power transmitter, aiming to solve the problem that the power transmitter cannot be normally started due to insufficient power when starting in an easy-to-implement and low-cost manner.

[0066] It should be noted that the directional terms "upper", "lower", "bottom", and the like concepts described in the following embodiments should be understood with reference to the directions shown in the drawings, and these directional terms are only used to help understanding, and cannot be regarded as specific limitations of the present application.

[0067] It is also to be noted that the improvements proposed by the present application can be implemented, for example, on the basis of an instrumentation and control system for power plants, which can also be understood as a power plant control system, of the type SPPA-T2000 developed by the company Siemens, of the corresponding type of cabinet equipment applied in this system, and of the power plant control system or cabinet equipment comprising the FUM230 card developed by the company Siemens. In the embodiments and examples described below, the distributed control system (i.e. DCS) forms part of the instrumentation and control system, and the bottom or lower layer of the overall architecture of the instrumentation and control system is arranged with power transmitters used as field instruments. Furthermore, the following will be described and explained in more detail with respect to an exemplary embodiment of an instrumentation and control system in which the FUM230 card is used as an I / O module.

[0068] Figure 1 An exemplary configuration for the power supply to a single power transmitter 1 in an instrumentation and control system for power plants is shown. This exemplary configuration can be applied in various typical instrumentation and control systems for power plants comprising a distributed control system arranged with a power supply busbar and a large number of power transmitters 1. In this regard, reference is made to Figure 1 and Figure 2 As shown, the power supply busbar 6 can provide a supply voltage, and the power transmitter 1 has a supply terminal 11, a ground terminal 12 and a signal output terminal.

[0069] It is to be understood that Figure 1 The configuration for the power supply to one power transmitter 1 and the other components involved therein or parts thereof, such as the circuit breaker 3 and the FUM230 card 2, are depicted for illustrative purposes, and the person skilled in the art can extrapolate from this example to the actual application to a plurality of power transmitters 1 and to the typical application of an instrumentation and control system for power plants comprising a large number of power transmitters 1. In such an actual application, the FUM230 card 2 can be applied in a one-to-many configuration with respect to the power transmitters 1, the circuit breaker 3 can be applied in a one-to-one configuration with respect to the power transmitters 1, and a single cabinet equipment can be provided with one or more FUM230 cards 2 and a plurality of circuit breakers 3, as required.

[0070] As shown in Figure 1 , this exemplary configuration for the power supply to a power transmitter 1 in an instrumentation and control system for power plants according to the preferred embodiment of the present application, the power transmitter 1 has a pair of signal output terminals, i.e. a positive signal output terminal 13 and a negative signal output terminal 14, as shown in Figure 1 , and the supply terminal 11 and the ground terminal 12, and the cabinet equipment 5 can be provided with the FUM230 card 2 and the circuit breaker 3.

[0071] The FUM230 card 2 is connected to the power bus 6 for being powered by the power bus 6, and the FUM230 card 2 can have a plurality of pairs of signal input terminals (only one pair is shown in the figure) Figure 1 Each pair of signal input terminals includes one positive signal input terminal 21 and one negative signal input terminal 22 as shown in the figure, and the positive signal input terminal 21 and the negative signal input terminal 22 are respectively connected to the positive signal output terminal 13 and the negative signal output terminal 14 for receiving the current signal output by the power transmitter 1. Figure 1

[0072] One end of the circuit breaker 3 is connected to the power bus 6, and the other end is connected to the power supply terminal 31 which is configured to be connectable to the power receiving terminal 11 so as to provide the power supply voltage to the power transmitter 1 via the circuit breaker 3. And optionally, the ground terminal 12 of the power transmitter can be grounded by connecting to the circuit breaker ground terminal 32 on the circuit breaker 3.

[0073] In fact, it can be understood that since the improvement of the power supply mode for the power transmitter 1 according to the present application can not have substantial impact on the design and functions of the current signal feedback loop between the FUM230 card 2 and the power transmitter 1, etc., in the embodiments according to the present application, the design regarding the current signal feedback loop between the FUM230 card 2 and the power transmitter 1, etc. can adopt or retain the design in the existing instrument control system or distributed control system.

[0074] More preferably and more specifically, in the above configuration, there is further provided a cable 4 for connecting the circuit breaker 3 and the power transmitter 1 and connecting the FUM230 card 2 and the power transmitter 1. As shown in the figure, the cable 4 includes a ground cable 42, a power supply cable 41 and a pair of signal cables, one end of the ground cable 42 is connected to the ground terminal 12 and the other end is connected to the circuit breaker ground terminal 32. The two ends of the power supply cable 41 are respectively connected to the power supply terminal 31 and the power receiving terminal 11, and the positive signal output terminal 13 and the negative signal output terminal 14 of the power transmitter 1 are respectively connected to a pair of positive signal input terminal 21 and negative signal input terminal 22 of the FUM230 card 2 via the positive signal cable 43 and the negative signal cable 44. Figure 1

[0075] In fact, the cable 4 used in the above configuration can be a four-wire instrument control cable already used in the existing or original instrument control system, so that at least to a great extent, there is no need to perform new cable laying work or cable replacement work. In other words, for the application of improving the original instrument control system for power plants according to the present application, the required human and material resources can be greatly saved.

[0076] It should be understood that in the above configuration Figures 1-2 ​​In the circuit breaker 3 and the power transmitter 1, "M" and "L+" are respectively used to schematically represent the interface or terminal of the ground circuit and the power supply circuit in the device, "I+" and "I-" are respectively used to schematically represent the interface or terminal of the positive and negative lines of the circuit related to the current signal transmission in the FUM230 card 2 and the power transmitter 1. In the circuit breaker 3 and the power transmitter 1, Figure 2 In the circuit breaker 3 and the power transmitter 1,

[0077] According to some preferred embodiments of the present application, the power supply voltage can be 24V DC voltage, the current signal can be a current signal in the range of 4-20mA, and the rated current of the circuit breaker 3 can be at least 0.5A.

[0078] According to such a scheme, the original power supply voltage currently used in the instrument control system of the power plant and the various power transmitters 1 currently widely used in various instrument control systems can be directly used, thereby minimizing the improvement of the original system required for the application of the improved application of the present application without affecting the key role and effect of ensuring the normal start of the power transmitter 1.

[0079] For example, according to the preferred embodiments described above, the power supply end voltage of the power transmitter 1 can be at least close to 24V, and thus the current required to provide a load power of 3W to the power transmitter 1 via the circuit breaker 3 is about 0.125A. On this basis, considering that the power required for starting is slightly higher than the rated power in the general working state, the current required will be lower than the rated current of the circuit breaker 3, so that the power transmitter 1 cannot be normally started due to current limiting can be avoided. And it can also be understood that in this configuration, the power supply end voltage of the plurality of power transmitters 1 in the system and the current limiting value of the circuit breaker 3 can be more stably configured and are not easy to fluctuate greatly, which is conducive to ensuring the reliability of the working of the power transmitter 1 under the premise of safety.

[0080] According to some preferred embodiments of the present application, the back plate is provided with a plurality of slots which are respectively connected to the power bus 6 independently of each other, and the FUM230 card 2 is respectively inserted into one of the plurality of slots to be connected to the power bus 6. In the cabinet device 5, a plurality of circuit breaker seats can also be provided, and the plurality of circuit breaker seats are respectively connected to the power bus 6 independently of each other, and the circuit breaker 3 can be inserted into one of the plurality of circuit breaker seats to be connected to the power bus 6.

[0081] Furthermore, in some application examples based on the instrumentation and control system or power plant control system model SPPA-T2000 developed by Siemens, or a corresponding model of cabinet equipment 5 used in the system, the back panel of the cabinet equipment 5 is provided with a series of slots arranged along the height direction of the cabinet equipment 5, or the aforementioned slots and circuit breaker bases can be arranged along the height direction of the cabinet equipment 5. Furthermore, optionally, the circuit breaker 3 can be inserted into a circuit breaker base marked "YC" on the cabinet equipment 5, and the circuit breaker base can be optionally located in the middle area of ​​the cabinet equipment 5 along the height direction.

[0082] In such Figure 2 In the example shown, a single cabinet device 5 may be provided with multiple circuit breakers 3 and a single FUM230 card. The single FUM230 card may receive current signals output by multiple power transmitters 1, but the power supply to the multiple power transmitters is respectively implemented via multiple circuit breakers 3. It is easy to understand that Figure 2 Only two circuit breakers 3 and two power transmitters 1 are schematically drawn in the figure, but other configurations with different numbers are also feasible according to actual needs.

[0083] In this way, not only can the additional personnel operation due to the improvement and change of the power supply method for the power transmitter 1 be avoided, but also when the power transmitter 1 in the instrumentation and control system needs to be changed, such as configuration change, instrument change or layout position change, the corresponding replacement of the circuit breaker 3 used for power supply is also very convenient.

[0084] The power plant instrumentation and control system and its cabinet equipment provided by the present invention can completely avoid the problem of power transmitters in the power plant instrumentation and control system failing to start normally due to insufficient power during startup, thereby safely and reliably ensuring the normal startup of each power transmitter in the system. In addition, when improving existing power plant instrumentation and control systems and their cabinet equipment according to the present invention, the existing power supply and cables can be used without the need for additional power supply and cables, or only minimal additional cables can be introduced, and no additional personnel are required for operation.

[0085] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0086] The above merely illustrates the specific embodiments of the present application, and is not used to limit the scope of the present application. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principle of the present application shall fall within the scope of the present application.

Claims

1. A cabinet device for an instrumentation and control system of a power plant, wherein the instrumentation and control system includes a distributed control system and a power transmitter, wherein the distributed control system has a power bus that provides a power supply voltage, and the power transmitter has a power receiving terminal, a grounding terminal, and a signal output terminal, characterized in that: The cabinet equipment includes: an I / O module connected to the power bus to be powered by the power bus, the I / O module having a signal input terminal configured to be connectable to the signal output terminal to receive the current signal output by the power transmitter; a power supply terminal configured to be connectable to the power receiving terminal; and a circuit breaker, one end of which is connected to the power bus and the other end of which is connected to the power supply terminal, so that the power transmitter can be connected to the power supply voltage via the circuit breaker, The power supply voltage is 24V DC, and the rated current of the circuit breaker is at least 0.5A.

2. The cabinet device according to claim 1, wherein: The cabinet device is provided with a backplane and a plurality of circuit breaker bases, the backplane is provided with a plurality of slots independently connected to the power bus, and the I / O module is inserted into one of the plurality of slots to be connected to the power bus; The plurality of circuit breaker bases are independently connected to the power bus bar, and the circuit breaker is inserted into one of the plurality of circuit breaker bases to be connected to the power bus bar.

3. The cabinet device according to any one of claims 1 to 2, characterized in that: The I / O module is a module of model FUM230 developed by Siemens.

4. An instrumentation and control system for a power plant, comprising a power transmitter and a distributed control system, wherein the power transmitter has a power receiving terminal, a grounding terminal, and a signal output terminal, and is characterized in that: The distributed control system comprises: a cabinet device comprising an I / O module, a power supply terminal, and a circuit breaker, wherein the I / O module comprises a signal input terminal connected to the signal output terminal to receive the current signal output by the power transmitter, one end of the circuit breaker being connected to the power supply terminal, which is further connected to the power receiving terminal; a power bus bar, the power bus bar providing a power supply voltage, the power bus bar being connected to the I / O module on one hand to power the I / O module, and the power bus bar being connected to the other end of the circuit breaker on the other hand to enable the power supply voltage to be connected to the power transmitter, The power supply voltage is 24V DC, and the rated current of the circuit breaker is at least 0.5A.

5. The instrumentation and control system according to claim 4, characterized in that: The I / O module has multiple pairs of signal input terminals, the power transmitter has a pair of signal output terminals, and the instrumentation and control system includes: a plurality of said power transmitters; A cable comprising a grounding cable, a power supply cable, and a pair of signal cables, wherein one end of the grounding cable is connected to the grounding terminal and the other end is grounded, and both ends of the power supply cable are respectively connected to the power supply terminal and the power receiving terminal, and a pair of the signal output terminals of each power transmitter are respectively connected to a pair of the multiple pairs of the signal input terminals of the I / O module via a pair of the signal cables.

6. The instrumentation and control system according to claim 4, characterized in that: The cabinet device is provided with a backplane and a plurality of circuit breaker bases, the backplane is provided with a plurality of slots independently connected to the power bus, and the I / O module is inserted into one of the plurality of slots to be connected to the power bus; The plurality of circuit breaker bases are independently connected to the power bus bar, and the circuit breaker is inserted into one of the plurality of circuit breaker bases to be connected to the power bus bar.

7. The instrumentation and control system according to any one of claims 4 to 6, characterized in that: The I / O module is a card developed by Siemens with the model FUM230.

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