Fieldbus for controlling the power output

Abstract

The invention relates to a bus system having a fieldbus coupler, a first module and a second module. The fieldbus coupler has a first fieldbus interface for a fieldbus and a first sub-bus interface for a sub-bus. The first module has a control interface for connecting to a control bus, a second sub-bus interface for communicating with the fieldbus coupler and a first control output. The second module has a control input and a power output. The first module is configured to derive a control signal from a signal received via the control interface during operation, and the second module is configured to control the power output of the second module in accordance with the control signal received via the control input.

Description

Technical Field

[0001] The present invention relates to a field bus system, which comprises a field bus coupler and modules connected in series. The present invention particularly relates to a field bus system for controlling a power output end. Background Art

[0002] When switching on power outputs in remote control systems, high demands are made on determinism and response times. Summary of the invention

[0003] In this regard, the present invention enriches the prior art because the system according to the present invention does not guide the operating instructions for controlling the power output end via a field bus coupler, but rather via a module which is itself connected in series to the field bus coupler, thereby reducing the requirements on the field bus coupler in terms of determinism and response time.

[0004] The system according to the invention comprises a fieldbus coupler, a first module and a second module, wherein the fieldbus coupler has a first fieldbus interface to a fieldbus and a first subbus interface to a subbus, wherein the first module has a control interface for connecting to a control bus, a second subbus interface for communicating with the fieldbus coupler and a first control output, wherein the second module has a control input and a power output. The first module is configured to derive a control signal from a signal received via the control interface during operation. The second module is configured to control the power output of the second module in accordance with the control signal received via the control input.

[0005] Here, the term "field bus coupler" used in the specification and claims is to be understood in particular as a device having a field bus interface, which is configured to transmit status signals to a higher-level controller via a field bus and receive control signals from the higher-level controller. Furthermore, the term "module" used in the specification is to be understood in particular as a bus terminal, which is configured to connect field bus couplers in series, wherein a series mechanical and electrical interconnection of a plurality of bus terminals can be achieved by connecting in series.

[0006] Furthermore, the term "subbus" as used in the description and claims is to be understood in particular as a bus system that connects a plurality of bus terminals and fieldbus couplers. Furthermore, the term "fieldbus" as used in the description and claims is to be understood in particular as a bus system via which a plurality of fieldbus couplers are connected to a higher-level controller. Furthermore, the term "control bus" as used in the description and claims is to be understood in particular as a bus system via which only or substantially control commands are transmitted and which places special demands on determinism and response time.

[0007] Furthermore, the term "control input / output" as used in the description and claims is to be understood in particular as an electrical connection via which a control signal is input or output during operation. Furthermore, the term "power output" as used in the description and claims is to be understood in particular as an electrical connection via which a higher voltage / current than the voltage / current input via the control input is output, thereby controlling a relatively higher voltage / current with a relatively small voltage / current.

[0008] The first module preferably has a second control output and is designed to receive configuration data from the field bus coupler via the second sub-bus interface during an initialization routine and to derive from the configuration data an assignment between signals received via the control interface during operation and control signals to be output via the first and second control outputs.

[0009] The second module preferably has a third sub-bus interface for communicating with the field bus coupler and is designed to transmit data about control signals received via the control input and / or data about voltages and / or currents output at the power output to the field bus coupler via the third sub-bus interface.

[0010] The second module preferably comprises an interface for querying the status of a device controlled by the second module and is designed to transmit data about the queried status to the field bus coupler via the third partial bus interface.

[0011] The first module is preferably configured to start a test run in response to a command from the field bus coupler and to generate data based on signals received via the control interface during the test run, the data indicating which control signals are derived from the aforementioned signals or which control signals will be derived during operation, and to transmit the generated data to the field bus coupler.

[0012] Furthermore, the system preferably comprises a transformer, wherein the second module is arranged to disconnect power to the transformer in response to a corresponding signal received via the control interface.

[0013] The first module and / or the second module are preferably arranged to be connected in series to the field bus coupler.

[0014] The control interface is preferably designed as an Ethernet interface or a fiber-optic interface.

[0015] The first module is preferably configured to receive Generic Object Oriented Substation Event (GOOSE) datagrams via the control interface.

[0016] The method according to the present invention is used to disconnect the transformer from the power supply network when using the system, and the method includes: sending a disconnection instruction from the host to the first module through the control interface; deriving a control instruction from the disconnection instruction and sending the control instruction to the control input of the second module through the first control output; and connecting the power output through the second module in response to receiving the control instruction, wherein the connected power output disconnects the transformer by means of a load disconnecting switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The invention is explained below in a detailed description using exemplary embodiments, with reference to the accompanying drawings, in which:

[0018] Figure 1 A block diagram showing a system according to the present invention;

[0019] Figures 2 to 5 Describe the use of the system according to the present invention; and

[0020] Figure 6 A flow chart of the method according to the invention is shown.

[0021] In this case, identical or functionally similar elements are denoted by the same reference symbols in the figures. DETAILED DESCRIPTION

[0022] Figure 1 A system 10 is shown, which comprises a fieldbus coupler 12 and modules 14a, 14b (fieldbus terminals) connected in series to the fieldbus coupler 12. The fieldbus coupler 12 has a first fieldbus interface 16 to a fieldbus 18 and a subbus interface 20 to a subbus 22. The modules 14a, 14b connected in series also have a subbus interface 24 to the subbus 22, so that communication between the fieldbus coupler 12 and the modules can take place via the subbus 22. In addition to the subbus interface 24, the first module 14a connected in series has a control interface 26 for connection to a control bus 28. The control interface 26 can be designed, for example, as an Ethernet interface or a fiber optic interface, via which "Generic Object Oriented Substation Event" (GOOSE) datagrams are received.

[0023] Furthermore, the first module 14a connected in series has a plurality of control outputs 30 and is configured to derive a control signal from a signal received during operation via the control interface 26 and output it to one of the control outputs 30. The power output 32 of the module 14b connected in series to the first module 14a is controlled by the control signal. Figure 2As shown in FIG, the assignment 34 between the signals received via the control interface 26 and the control signals to be output at the control output 30 for controlling the power output 32 is fixed or configurable. For example, configuration data are provided by the fieldbus coupler 12 during an initialization routine and the assignment 34 between the signals received via the control interface 26 and the control signals to be output via the control output 30 is derived from the configuration data.

[0024] If a signal is then received during operation via the control interface 26, then Figure 3 As shown, the module 14 outputs a control signal at one or more corresponding control outputs 30, thereby switching on the power output 32 connected to the control output 30. Figure 4 As shown in , the first module 14 is configured to start a test operation in response to an instruction from the field bus coupler 12, and to generate data based on signals received via the control interface 26 during the test operation, which data indicate which control signals are derived from the aforementioned signals or which control signals will be derived during operation, and to transmit the generated data to the field bus coupler 12. Thus, during the test operation, the power output 32 can be temporarily connected and the functionality of the first module 14 can be checked (during ongoing operation).

[0025] Furthermore, the module 14b connected in series to the first module 14a is configured to transmit data about control signals received via the control input and / or the voltage and / or current output at the power output 32 to the fieldbus coupler 12 via the sub-bus interface 24 (for monitoring and / or diagnostic purposes). Furthermore, the module 14b is configured to transmit data about the state of the device controlled by the module 14b to the fieldbus coupler 12 (for monitoring and / or diagnostic purposes). The transmitted data can be stored, for example, in a memory of the fieldbus coupler 12 and (periodically) queried by a central control unit via the fieldbus 18.

[0026] As in Figure 5 As shown in FIG. 1 , module 14 b is used to control transformer 38 (a transformer of the power supply network). Figure 6 As in step 42 of the flowchart shown, the host 40 sends a cut-off command to the first module 14a via the control interface 26, then according to step 44, the first module (according to the allocation method 34) derives a control signal from the cut-off command and outputs the control signal at the corresponding control output 30. In step 46, the power output 32 of the module 14b is connected to a currentless state by the control signal.

[0027] Reference numerals list

[0028] 10 System

[0029] 12 Fieldbus coupler

[0030] 14a module (fieldbus terminal)

[0031] 14b module (fieldbus terminal)

[0032] 16 Fieldbus interfaces

[0033] 18 Fieldbus

[0034] 20 Sub-bus interface

[0035] 22 Sub-bus

[0036] 24 Sub-bus interface

[0037] 26 Control Interface

[0038] 28 Control bus

[0039] 30 Control output

[0040] 32 Power output

[0041] 34 Allocation method

[0042] 36 Memory

[0043] 38 Transformer

[0044] 40 Host

[0045] 42 Process Steps

[0046] 44 Process Steps

[0047] 46 Process Steps

Claims

1. A bus system (10), comprising: A fieldbus coupler (12), wherein the fieldbus coupler (12) has a first fieldbus interface (16) to a fieldbus (18) and a first sub-bus interface (20) to a sub-bus (22); A first module (14a), wherein the first module (14a) has a control interface (26) for connecting to a control bus (28), a second sub-bus interface for communicating with the field bus coupler (12) and a first control output; and A second module (14b), wherein the second module (14b) has a control input terminal and a power output terminal (32); wherein, The first module (14a) is configured to derive a control signal from a signal received during operation via the control interface (26); and The second module (14b) is configured to control the power output end (32) of the second module (14b) according to a control signal received through the control input end; The first module (14a) has a second control output and is configured to receive configuration data from the field bus coupler (12) via the second sub-bus interface during an initialization routine and to derive from the configuration data an assignment (34) between signals received during operation via the control interface (26) and control signals to be output via the first and second control outputs.

2. The bus system (10) according to claim 1, wherein: The second module (14b) has a third sub-bus interface for communicating with the field bus coupler (12), and the second module is configured to transmit data about a control signal received via the control input and / or data about a voltage and / or a current output at the power output (32) to the field bus coupler (12) via the third sub-bus interface.

3. The bus system (10) according to claim 1 or 2, wherein: The second module (14b) comprises an interface for querying the status of a device controlled by the second module (14b), and the second module is configured to transmit data on the queried status to the field bus coupler (12) via a third sub-bus interface.

4. The bus system (10) according to claim 1 or 2, wherein: The first module (14a) is configured to start a test operation in response to a command from the field bus coupler (12) and to generate data based on signals received via the control interface (26) during the test operation, the data indicating which control signals are derived from the aforementioned signals or which control signals are derived during operation, and to transmit the generated data to the field bus coupler (12).

5. The bus system (10) according to claim 1 or 2, further comprising: Transformer (38); The second module is configured to cut off power to the transformer (38) in response to a corresponding signal received via the control interface (26).

6. The bus system (10) according to claim 1 or 2, wherein: The first module (14a) and / or the second module (14b) are arranged to be connected in series to the field bus coupler (12).

7. The bus system (10) according to claim 1 or 2, wherein: The control interface (26) is constructed as an Ethernet interface or an optical fiber interface.

8. The bus system (10) according to claim 1 or 2, wherein: The first module (14a) is configured to receive Generic Object Oriented Substation Event (GOOSE) datagrams via the control interface (26).

9. A method for disconnecting a transformer (38) from a power supply grid when using a bus system (10) according to claim 1, comprising: Sending a cut-off instruction from a host (40) to a first module (14a) via a control interface (26); deriving a control command from the switch-off command and transmitting the control command via a first control output (30) to a control input of a second module (14b); and In response to receiving the control instruction, the power output terminal (32) is turned on through the second module; The connected power output (32) disconnects the transformer (38) by means of a load disconnecting switch.

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