Energy storage high-voltage box test system

Abstract

The invention discloses an energy storage high-voltage box test system, which comprises a test tool, an upper computer and a to-be-tested high-voltage box, and is characterized in that the test tool comprises a plurality of test interfaces, and the test interfaces are connected with the high-voltage box and are used for detecting input and output digital quantity signals and communication channel signals of an LCU in a preset acquisition loop; input and output digital quantity signals, communication channel signals and collected data signals of the RCU are transmitted to an upper computer through a CAN interface so as to display a test result. According to the test system disclosed by the invention, the detection efficiency is improved through the test tool, the automatic test process can be realized, the manual operation time is shortened, and the test speed and efficiency are improved; meanwhile, by using the testing tool, errors caused by manual operation can be reduced, and the accuracy of a testing result is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of energy storage equipment, and in particular relates to an energy storage high-voltage box testing system. Background Art

[0002] The energy storage cabinet is an integrated energy storage system that integrates core components such as batteries, battery management system (BMS), power storage converter (PCS), and energy management system (EMS) in an outdoor cabinet. This design is highly integrated, standardized, easy to install and maintain, and can adapt to a variety of application scenarios, such as thermal power unit frequency regulation, photovoltaic consumption, peak shaving and valley filling, peak-valley electricity price profit, microgrid, etc.

[0003] The integrated energy storage cabinet has high integration and small footprint, which improves space utilization. It adopts standardized design and is easy to mass produce. In terms of battery management, each battery cluster is managed separately, which improves the battery life and system reliability. Fire protection is safe and reliable, with built-in smoke, temperature, and gas detection, and perfluorohexanone fire extinguishing device to ensure the safe operation of the system. It supports remote and local control, cloud platform monitoring, and IEC61850 communication protocol, which is convenient for system management and maintenance.

[0004] The energy storage high-voltage box is a key component in the energy storage system. The high-voltage box connects the battery cluster and the energy storage converter PCS and manages the battery high-voltage system. It has functions such as battery cluster voltage and current collection, contactor control and protection. It supports data status processing and charge and discharge control and management of battery packs in the same battery cluster. It also includes the internal power distribution circuit of the energy storage cabinet, mainly including the liquid-cooled host power supply circuit, the lighting circuit in the cabinet, etc. The high-voltage box is installed with DC molded case circuit breakers, DC contactors, DC fuses, current sensors, main control modules, switching power supplies, miniature circuit breakers, etc.

[0005] The energy storage high-voltage box uses an integrated wiring harness to connect various components to ensure stable and reliable connections. The internal CAN interface collects the cell voltage and temperature data of all battery modules to protect the battery modules. In addition, it also has the function of communicating with the PCS. The main circuit is equipped with circuit breakers, fuses, and relays to manage the charge and discharge of the entire battery system and ensure the safe and reliable operation of the system.

[0006] The structure and functions of the energy storage high-voltage box are complex and highly integrated. The high-voltage boxes in the same project are basically the same and can be mass-produced. Therefore, it is very important to test the high-voltage box before it leaves the factory. A complete testing system can ensure that the functions of the high-voltage box are complete and the operation is reliable. At present, the capacity of energy storage units is developing rapidly, and the number of single cabinets is increasing. The number of energy storage cabinets in the Three Gorges Binhai 200MW / 400MWh string energy storage power station project has reached 1,080. Therefore, the design of the energy storage high-voltage box test tooling is particularly important. Summary of the invention

[0007] In view of the above-mentioned defects, the present invention provides a testing system for an energy storage high-voltage box, which improves the detection efficiency. Through an automated testing process, it reduces the time of manual operation and improves the speed and efficiency of the test. At the same time, through the use of testing tooling, it reduces human operation errors and improves the accuracy of the test results.

[0008] A system for testing an energy storage high-voltage box comprises a testing tool, a host computer and a high-voltage box to be tested. The testing tool comprises a plurality of testing interfaces, which are connected to the high-voltage box and are used to detect input and output digital signals and communication channel signals of an LCU in a preset acquisition loop, input and output digital signals, communication channel signals and collected data signals of an RCU, and transmit them to the host computer via a CAN interface to display the test results.

[0009] Preferably, the high-voltage box includes an LCU local controller and an RCU, wherein the LCU and the RCU both have a CAN communication interface, a 485 communication interface and several DI / DO interfaces, the CAN communication interfaces are correspondingly connected to form a CAN communication channel, and the 485 communication interfaces are correspondingly connected to form a 485 communication channel; the DI / DO interface is used to input and output digital signals, wherein the DI / DO interface of the RCU is connected to one or more of the PCS dry contacts, the high-voltage box DC circuit breaker, the main contactor, and the fuse, and the data acquisition interface collects one or more data information of the total positive voltage, the total negative voltage, and the Hall current; the DI / DO interface of the LCU is connected to one or more of the water immersion signal, the fire signal, the emergency stop signal, and the access control signal.

[0010] Preferably, the test tooling includes a test interface, which includes one or more of a P1 BMU connector, a P2 DI / DO connector, a P3 water immersion / firefighting connector, a P4 PCS connector, and a P5 debugging and spare connector, wherein P1 is used to connect the RCU and the slave control unit BMU, P2 is used to access the high-voltage box indicator light and emergency stop signal, P3 is used to access the LCU's water immersion / firefighting signal, P4 is used to connect the PCS dry contact, and P5 is used to connect the host computer.

[0011] Preferably, the P1 BMU connector has a low-voltage output and a low-voltage input interface, the CAN communication interface of the low-voltage output interface is connected to the D port 3 and 4 pins of the RCU, and the slave control power supply - interface is connected to the D port 5 pin of the RCU; at the same time, the slave control power supply + / - interface, the encoding IO1 interface and the CAN communication interface are correspondingly connected to the power supply port, IO port and CAN communication interface of the BMU.

[0012] Preferably, the P2 DI / DO connector has several DO interfaces and several DI interfaces, wherein DO1 is connected to the operation indicator light, DO2 is connected to the fault indicator light, DO3 is connected to the alarm indicator light, DI1 is connected to the access control signal, DI2 is connected to the standby signal, and DI3 is connected to the emergency stop signal.

[0013] Preferably, the P3 water immersion / fire protection connector has a 485 communication interface, a water immersion detector interface, a fire protection dry contact port and a spare port. The 485 communication interface of P3 is connected to the 485A1-B1 of the LCU, the water immersion detector interface is connected to the 2nd and 3rd pins of the water immersion transmitter SJ, the fire protection dry contact port is connected to the DI5 and 6 pins of the LCU, and the spare port is connected to the DI4 and 7 pins of the LCU. At the same time, the access control, spare and emergency stop signals of the P2 DO interface are all connected to the fire protection dry contact port and the spare port.

[0014] Preferably, the P4 PCS connector has a CAN communication interface, a PCS dry contact output interface and a 485 communication interface, wherein the CAN communication interface of P4 is connected to pins 12 and 24 of the RCU B port; the PCS dry contact output interface is connected to pins 15 and 31 of the RCU C port, and is also connected to the water detector interface of P3; the 485A2-B2 of P4 is connected to the 485A2-B3 of the LCU, and is also connected to the 485A1-B1 pin of P3.

[0015] Preferably, the P5 debug and standby connector has a master CAN1 debug port, a master CAN2 debug port, an LCU CAN1 port, and an RCU 485 port, wherein the master CAN1 debug port is correspondingly connected to the CAN communication interface of P4, and is also connected to the host computer to realize communication; the master CAN2 debug port is correspondingly connected to pins 3 and 6 of P1; the LCU CAN1 port is correspondingly connected to CAN1_H and CAN1_L of the LCU, and is also connected to the host computer to realize communication; the RCU 485 port is correspondingly connected to 485A1-B1 and A2-B3 of the RCU.

[0016] Preferably, the high-voltage box panel is also provided with network port 1, network port 2 and USB interface. Network port 1 is connected to the LAN interface of the RCU, and network port 2 is connected to the host computer via a network cable. The U disk storing the test program is inserted into the USB interface to realize the burning of the test program.

[0017] Preferably, the energy storage high-voltage box test system also includes a number of indicator lights HL. The high-voltage box is also provided with a lighting module. The indicator light HL1 is connected to the lighting module as an indication of a normal lighting circuit; the indicator lights HL3 and HL4 are respectively connected to the VIN+ / - of the RCU and the 24V+ / - of the LCU as power indicator lights; HL11 and HL12 are respectively used as operation indicator lights and fault indicator lights, and are respectively connected to DO1 and DO2 of the P2 DI / DO connector; HL13 is connected between the circuit formed by the DC circuit breaker KM1 and the fuse FU1 and the circuit formed by the DC circuit breaker KM2 and the Hall sensor, and is connected to DO3 of the P2 DI / DO connector as an alarm indicator light.

[0018] The beneficial effects of the present invention are:

[0019] (1) The energy storage high-voltage box test system disclosed in the present invention improves the detection efficiency. Through the automated test process, it reduces the time of manual operation and improves the speed and efficiency of the test. The high-voltage box tooling can complete the test within 5 minutes, while the traditional manual test takes 30 minutes;

[0020] (2) The energy storage high-voltage box test system disclosed in the present invention is easy to operate: the test tooling system interface is simple, and the operator can easily perform test settings and result interpretation, which simplifies the operation process;

[0021] (3) The energy storage high-voltage box test system disclosed in the present invention has high accuracy: by using the test tooling, human operation errors are reduced and the accuracy of the test results is improved. The system intuitively displays the function test results through the on and off indicator lights;

[0022] (4) The energy storage high-voltage box testing system disclosed in the present invention reduces costs: the automated testing tooling reduces the need for manual testing, thereby reducing testing costs, and also reduces potential cost losses caused by testing errors;

[0024] (5) The energy storage high-voltage box testing system disclosed in the present invention improves production quality: through comprehensive testing and fault analysis, the test tooling helps to improve the production quality of the energy storage high-voltage box and ensure that the product meets safety and performance standards before leaving the factory;

[0025] (6) The present invention is convenient for maintenance: the design of the high-voltage box tooling system takes into account the convenience of maintenance, and the test tooling can be adjusted according to the project to meet the testing requirements of different projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0027] Figure 1 This is a schematic diagram of the connection of a test fixture according to an embodiment of the present invention;

[0028] Figure 2 It is a main circuit test electrical diagram of a test tool according to an embodiment of the present invention;

[0029] Figure 3 is a test tool control circuit test electrical diagram of an embodiment of the present invention;

[0030] Figure 4 This is an electrical diagram of a BMU slave control test of a test tool according to an embodiment of the present invention.

[0031] Figure 5 This is an electrical diagram of a test tool RCU main control test according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example

[0034] The present invention discloses an energy storage high-voltage box test system, comprising a test tool, a host computer and a high-voltage box to be tested. The test tool comprises a plurality of test interfaces, which are connected to the high-voltage box and are used to detect input and output digital quantity signals and communication channel signals of an LCU in a preset acquisition loop, input and output digital quantity signals, communication channel signals and collected data signals of an RCU, and transmit them to the host computer through a CAN interface to display the test results.

[0035] Test tooling composition:

[0036] The high-voltage box test tool consists of test software, test harness, indicator light, slave control unit BMU, etc. The LCU local controller and RCU main control module prefabricated in the high-voltage box are pre-downloaded with the preset test program before leaving the factory, and then the test harness plug of the test tool is inserted into the corresponding socket of the high-voltage line, and the test is carried out according to the test requirements.

[0037] like Figure 1-4 The figure shows the connection diagram of the test tooling. The test tooling includes a test interface, indicator lights and a slave control unit BMU. The test interface includes a P1 BMU connector, a P2 DI / DO connector, a P3 water immersion / firefighting connector, a P4 PCS connector and a P5 debugging and spare connector.

[0038] The high-voltage box includes an LCU local controller and an RCU. Both the LCU and the RCU have a CAN communication interface, a 485 communication interface and several DI / DO interfaces. The CAN communication interfaces are connected correspondingly to form a CAN communication channel, and the 485 communication interfaces are connected correspondingly to form a 485 communication channel; the DI / DO interface is used to input and output digital signals, wherein the DI / DO interface of the RCU is connected to one or more of the PCS dry contacts, the high-voltage box DC circuit breaker, the main contactor, and the fuse, and the data acquisition interface collects one or more data information of the total positive voltage, the total negative voltage, and the Hall current; the DI / DO interface of the LCU is connected to one or more of the water immersion signal, the fire signal, the emergency stop signal, and the access control signal.

[0039] The connection between the test fixture and the high-voltage box is as follows:

[0040] The P1 BMU connector has low-voltage output and low-voltage input interfaces for connecting the RCU and BMU. The CAN communication interface (pins 3 and 6) of the low-voltage output interface is connected to the 3 and 4 pins of the D port of the RCU, and the slave control power supply - (pin 4) is connected to the 5 pin of the D port of the RCU. At the same time, the slave control power supply + / - (pins 1 and 4), coding IO1 (pin 2), and CAN communication interface (pins 3 and 6) are correspondingly connected to the power supply port (pins 1 and 4), IO port (pin 5), and CAN communication interface (pins 3 and 6) of #1BMU; the slave control power supply + (pin 7) of the low-voltage input port is connected to the 6 pin of the D port of the RCU. At the same time, the slave control power supply +- (pins 7 and 10), coding IO2 (pin 11), and CAN communication interface (pins 3 and 6) are correspondingly connected to

[0041] #2BMU's power supply port (pins 1 and 4), IO port (pin 2), and CAN communication interface (pins 3 and 6).

[0042] The P2 DI / DO connector has several DO interfaces and several DI interfaces. Among them, DO1 is connected to the running indicator light, DO2 is connected to the fault indicator light, DO3 is connected to the alarm indicator light, DI1 is connected to the access control signal, DI2 is connected to the standby signal, and DI3 is connected to the emergency stop signal.

[0043] The P3 water immersion / fire protection connector has a 485 communication interface, a water immersion detector interface, a fire protection dry contact port and a spare port. Among them, the 485 communication interface of P3 is connected to the 485A1 B1 of the LCU, the water immersion detector interface is connected to the 2 and 3 pins of the water immersion transmitter SJ, the fire protection dry contact port is connected to the DI5 and 6 pins of the LCU, and the spare port is connected to the DI4 and 7 pins of the LCU. At the same time, the access control, spare and emergency stop signals of the P2DO interface are all connected to the fire protection dry contact port and the spare port.

[0044] The P4 PCS connector has a CAN communication interface, a PCS dry contact output interface, and a 485 communication interface. The CAN communication interface of P4 is connected to the 12th and 24th pins of the RCU B port; the PCS dry contact output interface is connected to the 15th and 31st pins of the RCU C port, and is also connected to the water detector interface of P3; the 485A2-B2 of P4 is connected to the 485A2-B3 of the LCU, and is also connected to the 485A1-B1 pins of P3.

[0045] The P5 debug and spare connector has the main control CAN1 debug port, the main control CAN2 debug port, the LCU CAN1 port, and the RCU485 port. Among them, the main control CAN1 debug port is connected to the CAN communication interface (pins 1 and 2, namely CAN1_H and CAN1_L) of P4, and is also connected to the host computer for communication; the main control CAN2 debug port is connected to pins 3 and 6 of P1; the LCU CAN1 port is connected to the CAN1_H and CAN1_L of the LCU, and is also connected to the host computer for communication; the RCU 485 port is connected to the RCU 485A1-B1 and A2-B3.

[0046] At the same time, the high-voltage box panel is also equipped with network port 1, network port 2 and USB interface. Network port 1 is connected to the LAN interface of the RCU, and network port 2 is connected to the host computer through a network cable. Insert the U disk storing the test program and test records into the USB interface to realize the burning of the test program.

[0047] like Figure 1-2 As shown, by connecting the test fixture to the high-voltage box, the following five test items can be tested:

[0048] 1) Lighting circuit test: Close the lighting circuit miniature circuit breaker QF1 through an external power supply. The lighting circuit indicator HL1 on the high-voltage box should light up and the external lighting should work normally.

[0049] 2) DC power supply test, close the miniature circuit breaker of the switch power circuit, the power indicator light HL3 of the LCU local controller on the high-voltage box and the power indicator light HL4 of the RCU main control module should light up.

[0050] 3) Digital input and output interface test, mainly including LCU local controller input and output digital signals such as access control, AC molded case position, water immersion signal, emergency stop signal, fire protection, AC molded case tripping signal, etc. LCU detects whether the input and output interfaces are normal by running the test program, and lights up the operation indicator light HL11, alarm indicator light HL12, and fault indicator light HL13 according to the output combination in the test table.

[0051] 4) Test the communication interface of the LCU local controller peripheral equipment, including the main control fire signal channel, RS485 and CAN communication channel, and Ethernet communication test. The host computer reads the LCU peripheral interface data to determine whether the above communication interfaces are normal.

[0052] 5) Test the peripherals of the RCU main control module, including the input and output digital signal channels of the high-voltage box DC circuit breaker, main contactor, fuse, etc., the measurement of the total positive voltage, total negative voltage, Hall current, and the test of CAN communication and Ethernet communication. The host computer reads the RCU communication interface data connected to the LCU to determine whether the above functions are normal.

[0053] Test tooling materials

[0054] The high voltage box test kit contains the following materials:

[0055]

[0056] Test USB disk production:

[0057] The LCU local controller test requires the production of a program burning card. The required materials and steps are as follows:

[0058] Serial number materials quantity illustrate 1 USB flash drive (2G or more) 1 For storing test programs 2 Testing Procedure 1 Test fixture program 3 balenaEtcher 1 USB flash drive burning tool

[0059] 1) Prepare the test program LCU100-TEST-V1.x-20xxxxxx.raw.gz;

[0060] 2) Insert the USB drive into the computer and open the burning software BalenaEtcher;

[0061] 3) Select the image and USB disk in the software, click Burn, and wait for the burning to complete.

[0062] Testing Process

[0063] The test results are indicated by the 4 LED indicators on the LCU local controller and the 3 status lights included in the test tool during the test. During offline testing, the test tool is connected to an external power supply and all connector plugs are inserted into the corresponding sockets of the high-voltage box. The test computer is turned on and the test USB flash drive is inserted. The LCU local controller automatically enters the test mode and performs the test. If any problem occurs during the test, the test will stop, and the test content will be indicated by the 4 indicator lights inside the LCU local controller and the 3 status lights outside the high-voltage box. The test process and error information are described as follows:

[0064]

[0065]

[0066] The design of the energy storage cabinet high-voltage box test system can greatly improve the speed and quality of high-voltage box off-line inspection, improve the automation level of energy storage system production, and improve the overall efficiency of the energy storage system.

[0067] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A test system for an energy storage high-voltage box, characterized in that: It includes a test tool, a host computer and a high-voltage box to be tested. The test tool includes several test interfaces, which are connected to the high-voltage box and are used to detect the input and output digital signals and communication channel signals of the LCU in a preset acquisition loop, the input and output digital signals, communication channel signals and collected data signals of the RCU, and transmit them to the host computer through the CAN interface to display the test results.

2. The energy storage high-voltage box testing system according to claim 1, characterized in that: The high-voltage box includes an LCU local controller and an RCU. Both the LCU and the RCU have a CAN communication interface, a 485 communication interface and several DI / DO interfaces. The CAN communication interfaces are correspondingly connected to form a CAN communication channel, and the 485 communication interfaces are correspondingly connected to form a 485 communication channel; the DI / DO interface is used to input and output digital signals, wherein the DI / DO interface of the RCU is connected to one or more of the PCS dry contacts, the high-voltage box DC circuit breaker, the main contactor, and the fuse, and the data acquisition interface collects one or more data information of the total positive voltage, the total negative voltage, and the Hall current; the DI / DO interface of the LCU is connected to one or more of the water immersion signal, the fire signal, the emergency stop signal, and the access control signal.

3. The energy storage high-voltage box testing system according to claim 1, characterized in that: The test tooling includes a test interface, which includes one or more of a P1 BMU connector, a P2 DI / DO connector, a P3 water immersion / firefighting connector, a P4 PCS connector, and a P5 debugging and spare connector, wherein P1 is used to connect the RCU and the slave control unit BMU, P2 is used to access the high-voltage box indicator light and emergency stop signal, P3 is used to access the water immersion / firefighting signal of the LCU, P4 is used to connect the PCS dry contact, and P5 is used to connect the host computer.

4. The energy storage high-voltage box testing system according to claim 3 is characterized in that: The P1 BMU connector has low-voltage output and low-voltage input interfaces. The CAN communication interface of the low-voltage output interface is connected to the D port 3 and 4 pins of the RCU, and the slave control power supply - interface is connected to the D port 5 pin of the RCU; at the same time, the slave control power supply + / - interface, encoding IO1 interface and CAN communication interface are connected to the power supply port, IO port and CAN communication interface of the BMU respectively.

5. The energy storage high-voltage box testing system according to claim 4, characterized in that: The P2 DI / DO connector has several DO interfaces and several DI interfaces, among which DO1 is connected to the running indicator light, DO2 is connected to the fault indicator light, DO3 is connected to the alarm indicator light, DI1 is connected to the access control signal, DI2 is connected to the standby signal, and DI3 is connected to the emergency stop signal.

6. The energy storage high-voltage box testing system according to claim 5, characterized in that: The P3 water immersion / fire protection connector has a 485 communication interface, a water immersion detector interface, a fire protection dry contact port and a spare port. The 485 communication interface of P3 is connected to the 485A1-B1 of the LCU, the water immersion detector interface is connected to the 2nd and 3rd pins of the water immersion transmitter SJ, the fire protection dry contact port is connected to the DI5 and 6 pins of the LCU, and the spare port is connected to the DI4 and 7 pins of the LCU. At the same time, the access control, spare and emergency stop signals of the P2 DO interface are all connected to the fire protection dry contact port and the spare port.

7. The energy storage high-voltage box testing system according to claim 6, characterized in that: The P4 PCS connector has a CAN communication interface, a PCS dry contact output interface and a 485 communication interface. The CAN communication interface of P4 is connected to the 12th and 24th pins of the RCU B port; the PCS dry contact output interface is connected to the 15th and 31st pins of the RCU C port, and is also connected to the water detector interface of P3; the 485A2-B2 of P4 is connected to the 485A2-B3 of the LCU, and is also connected to the 485A1-B1 pin of P3.

8. The energy storage high-voltage box testing system according to claim 7, characterized in that: The P5 debug and spare connector has a master CAN1 debug port, a master CAN2 debug port, an LCU CAN1 port, and an RCU 485 port. The master CAN1 debug port is connected to the CAN communication interface of P4, and is also connected to the host computer for communication; the master CAN2 debug port is connected to pins 3 and 6 of P1; the LCU CAN1 port is connected to CAN1_H and CAN1_L of the LCU, and is also connected to the host computer for communication; the RCU 485 port is connected to 485A1-B1 and A2-B3 of the RCU.

9. The energy storage high-voltage box testing system according to claim 8, characterized in that: The high-voltage box panel is also provided with network port 1, network port 2 and USB interface. Network port 1 is connected to the LAN interface of RCU, and network port 2 is connected to the host computer through a network cable. The U disk storing the test program is inserted into the USB interface to realize the burning of the test program.

10. The energy storage high-voltage box testing system according to any one of claims 1 to 9, characterized in that: The energy storage high-voltage box test system also includes a plurality of indicator lights HL. The high-voltage box is also provided with a lighting module. The indicator light HL1 is connected to the lighting module as an indication of a normal lighting circuit. The indicator lights HL3 and HL4 are respectively connected to the VIN+ / - of the RCU and the 24V+ / - of the LCU as power indicator lights. HL11 and HL12 are respectively used as operation indicator lights and fault indicator lights, and are respectively connected to DO1 and DO2 of the P2 DI / DO connector. HL13 is connected between the circuit formed by the DC circuit breaker KM1 and the fuse FU1 and the circuit formed by the DC circuit breaker KM2 and the Hall sensor, and is connected to DO3 of the P2 DI / DO connector as an alarm indicator light.

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