CN110955187B - PLC control system and control method for dual power supply and communication of speed regulator hydraulic system - Google Patents
PLC control system and control method for dual power supply and communication of speed regulator hydraulic system Download PDFInfo
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Abstract
A PLC control system and a control method for dual power supply and communication of a speed regulator hydraulic system comprise a PLC main station A, PLC main station B and a substation C. The communication module of the substation C is connected and communicated with the communication module of the PLC master station through a double-channel coaxial cable, and data are sent to the CPU module of the master station in real time. The touch screen HMI is respectively in communication connection with the CPU module of the PLC master station through the hub Ethernet as a transmission medium, so that real-time data exchange between the touch screen HMI and the PLC master station is realized. Redundant communication between the master station and the PC. The PLC master station A and the PLC master station B are connected through optical fiber communication. The system adopts the dual PLC control of redundant power supply and communication, so that the system is not affected by local single fault when in operation, and the on-line maintenance can be realized; meanwhile, the normal operation of the system is not affected when the fault component is repaired off-line, so that the purposes of improving the reliability of the system and reducing the failure rate can be achieved.
Description
Technical Field
The invention relates to the technical field of hydraulic system control of a hydraulic turbine speed regulator, in particular to a PLC control system and a control method for dual power supply and communication of the hydraulic system of the speed regulator.
Background
The hydraulic system of the hydraulic turbine governor plays a very important role in the running process of the unit, can receive remote operation instructions, comprises a start-stop hydraulic system, and can monitor own running parameters, including the liquid level and pressure of a pressure oil tank, the liquid level of an oil return tank, the states of an oil pump and a combination valve, the pressure of a pipeline, the pressure of an outlet of the oil pump and the like. Thus placing high demands on the stability and reliability of the control system. The field control system in the prior art has the following defects:
1: the communication structure, the PLC module, the CPU and the power supply problems adopted by the field control system can cause the control interruption of the field PLC to the field device, so that the reliability of the PLC control system is greatly reduced.
2: When the communication of the coaxial cable fault is interrupted, the current main CPU system reports a hot standby offline fault, and simultaneously, the communication between the main CPU system and the HMI touch screen is disconnected, so that a communication link is disconnected with a PC, and the HMI cannot update data in time.
3: The existing control system adopts a single power supply module to supply power, redundant power supply cannot be carried out, when the power supply module of the main station of the PLC control system fails or the power supply module of the substation fails, the power supply of the whole main station or the substation disappears, the corresponding PLC system loses control effect, and serious equipment hidden danger exists.
Disclosure of Invention
In order to solve the technical problems, the invention provides a PLC control system and a control method for dual power supply and communication of a speed regulator hydraulic system, which have the characteristics of high reliability and low cost. The system adopts the dual PLC control of redundant power supply and communication, so that the system is not affected by local single fault when in operation, and the on-line maintenance can be realized; meanwhile, the normal operation of the system is not influenced when the fault part is repaired offline, so that the purposes of improving the reliability of the system and reducing the failure rate can be achieved, and the reliability of the system can be greatly improved; and the economic loss caused by shutdown or equipment damage due to the failure of the control system is effectively avoided.
The technical scheme adopted by the invention is as follows:
A PLC control system for dual power supply and communication of a speed regulator hydraulic system comprises a first PC, a second PC, a PLC master station A, PLC, a master station B and a substation C, wherein the first HUB HUB1, the second HUB HUB2 and a touch screen HMI.
The PLC master station A comprises a power supply module A1, a first CPU module, a first communication module A0 and a power supply module A2;
the PLC master station B comprises a power supply module B1, a second CPU module, a second communication module B0 and a power supply module B2;
the substation C comprises a power supply module C1, a third communication module C0, a plurality of digital quantity input modules, a plurality of digital quantity output modules, at least one analog quantity input module, at least one analog quantity output module and a power supply module C2;
The third communication module C0 is respectively connected and communicated with the first communication module A0 of the PLC master station A and the second communication module B0 of the PLC master station B through a first double-channel coaxial cable and a second double-channel coaxial cable, and sends data to the CPU module of the master station in real time;
the touch screen HMI is respectively connected with the first CPU module of the PLC master station A and the second CPU module of the PLC master station B in a communication way by taking the Ethernet as a transmission medium through the first HUB HUB1 and the second HUB HUB2, so that real-time data exchange between the touch screen HMI and the PLC master station A, PLC master station B is realized.
The first CPU module of the PLC master station A is in communication connection with the first PC 1 through the Ethernet, and the second CPU module of the PLC master station B is in communication connection with the second PC 2 through the Ethernet, so that redundant communication between the master station and the PC is realized;
The PLC master station A and the PLC master station B are in communication connection through an optical fiber a.
The first CPU module of the PLC master station A and the second CPU module of the PLC master station B are communicated by adopting an optical fiber a, so that hot standby redundant control of the two CPU modules is realized, and the hot standby switching function is realized.
The PLC master station A comprises a first rack with a plurality of slot openings, and a power module A1, a first CPU module, a first communication module A0 and a power module A2 are arranged on the first rack;
the PLC master station B comprises a second rack with a plurality of slot openings, and a power module B1, a second CPU module, a second communication module B0 and a power module B2 are arranged on the second rack;
the substation C comprises a third rack with a plurality of slot openings, and a power supply module C1, a third communication module C0, a digital quantity input module, a digital quantity output module, an analog quantity input module and an analog quantity output module are arranged on the third rack; and a power module C2.
The first, second and third frames are sixteen-slot frames with protective coatings, so that the system performance is improved, and the cost is reduced.
The power supply modules A1, A2, B1, B2, C1 and C2 are power supply modules in a DC24V redundancy working mode. And has an overcurrent and overvoltage protection function. The module 140-CPS-224-00 of Schneider product is used.
The first CPU module and the second CPU module adopt built-in Ethernet coprocessors, and a processor in a standby battery power supply mode when power is off adopts a communication port at least provided with a Modbus (RS 232) port, a Modbus Plus (RS 485) port, a USB port and an Ethernet port (serving as HSBY hot standby ports), and has a hot standby offline checking logic function. The first CPU module and the second CPU module adopt Schneider Quantum product 140CPU672 61 modules.
The communication module adopts a channel with two RIO coaxial connectors, can automatically diagnose the dual-port memory and the LAN controller when power is applied, and can automatically diagnose and execute the check sum RAM address or data when in operation. The first communication module A0 and the second communication module B0 have remote I/O header dual-channel modules, which are installed in the same backplane as the respective system control first CPU module and second CPU module, the RIO header being used for bi-directional data transmission between the CPU module and the RIO substation module (installed in separate backplanes), and the coaxial cable network being used for interconnection between the RIO header module and one or more RIO substation modules.
The third communication module C0 adopts a remote I/O substation dual-channel module for bi-directionally transmitting data between an I/O module installed on the same RIO substation backplane and a RIO header module installed in the CPU backplane through a coaxial cable network.
With schneiderian Quantum product, the first communication module A0, the second communication module B0 are 140CRP93X200 modules, and the third communication module C0 is 140CRA93200 modules.
The digital quantity input module adopts a source input module with 32 paths of DC 24V, connects a shared input common terminal to 0V, and has a fault detection function. The digital quantity input module adopts a Schneider Quantum product 140DDI35310 digital quantity input module.
The digital quantity output module adopts an active load output module with 32 paths of DC24V, and has the functions of short circuit prevention and overload protection. The digital quantity output module adopts a Schneider Quantum product 140DDO35300 digital quantity output module.
The analog input module is provided with an 8-channel differential input module and has a broken line or undervoltage fault detection function.
The analog input module adopts a Schneider Quantum product 140ACI13000 analog input module.
The analog output module adopts an 8-channel analog output module and is used for controlling and monitoring the current in the 4-20mA, 0-20 mA and 0-25mA loops.
The analog output module adopts a Schneider Quantum product 140ACO13000 analog output module.
The first CPU module and the second CPU module adopt a Schneider Quantum product 140CPU67160 type CPU module.
The invention relates to a PLC control system and a control method for dual power supply and communication of a speed regulator hydraulic system, which have the beneficial effects that:
1: the invention adopts redundant CPU configuration, so that when the control system runs and the CPU fails, the function of undisturbed switching can be realized, and the safety of the system is ensured.
2: By adopting the redundant power supply module, when a certain power supply fails, the power supply is not affected by local single failure, and the on-line maintenance can be realized.
3: Meanwhile, the normal operation of the system is not influenced when the fault part is repaired offline, so that the purposes of improving the safety and reliability of the control system and reducing the failure rate can be achieved, the automation technology level and the production efficiency are greatly improved, and the economic loss caused by shutdown or equipment damage due to the fault of the control system is effectively avoided.
4: By adopting the redundant communication mode, the data can be updated in time when communication of a certain link is interrupted, the real-time performance of data response is improved, and the actual requirement of high reliability of a control system is met.
5: According to the PLC control system for dual power supply and communication of the hydraulic system of the speed regulator, the two sets of master stations are completely identical in structure, so that the power redundancy, the CPU controller redundancy and the communication redundancy of the PLC control system are realized, the reliability of the control system is ensured, the data updating time of the HMI touch screen is ensured, and the real-time response speed of the redundant control system in case of faults is improved.
Drawings
FIG. 1 is a schematic diagram of the connection of the control system of the present invention.
Detailed Description
As shown in FIG. 1, a PLC control system for dual power and communication of a speed regulator hydraulic system comprises a first PC 1, a second PC 2, a PLC master station A, PLC, a substation C, a first HUB HUB1, a second HUB HUB2, a touch screen HMI and three racks.
The first PC 1 and the second PC 2 can monitor system data and modify programs online in real time, and control the flow of production equipment can be completed. The first CPU module of the PLC master station A is in communication connection with the first PC 1 through the Ethernet, and the second CPU module of the PLC master station B is in communication connection with the second PC 2 through the Ethernet. And realizing real-time data exchange between the PC and the PLC master station system.
The PLC master station A, PLC master station B has a hot standby switching function and a redundant power supply mode, the hardware configuration of the hot standby switching function is identical, the hot standby switching function comprises a frame with sixteen slot openings provided with a protective coating, two power supply modules, a CPU module and a communication module, the function of communication is completed by adopting a high-speed asynchronous data receiving and transmitting method between the PLC master station A and the PLC master station B, the data transmission medium is an optical fiber a, and the hot standby switching function can be realized when the main CPU module fails.
Substation C has a hot standby redundant power supply mode and comprises a sixteen-slot rack with protective coatings, and two power supply modules: the power supply module C1, C2, a third communication module C0, two digital quantity output modules C4.1, C4.2, two digital quantity input modules C3.1, C3.2 (which can be increased or decreased as required), an analog quantity input module C5 (which can be increased or decreased as required) and an analog quantity output module C6 (which can be increased or decreased as required). The third communication module C0 of the substation C is connected and communicated with the communication module of the PLC master station A, PLC and the communication module of the master station B through a double-channel coaxial cable, and sends data to the CPU module of the PLC master station in real time.
The touch screen HMI can display the acquired data, event records and fault alarms of the system in real time, and can complete parameter setting of the control equipment, and the touch screen HMI is respectively communicated with the CPU module of the PLC master station A, PLC master station B to establish connection through the HUB HUB Ethernet serving as a transmission medium, so that real-time data exchange between the touch screen HMI and the master station PLC system is realized.
The invention provides a PLC control system with dual power supply and communication of a speed regulator hydraulic system, wherein the two sets of master stations have the same structure, so that the power supply redundancy, the CPU controller redundancy and the communication redundancy of the PLC control system are realized, the reliability of the control system is ensured, the update of HMI touch screen data is ensured to be timely, and the real-time response speed of the redundant control system in case of faults is improved.
And (one) a redundant control system structure:
the first CPU module of the PLC master station A and the second CPU module of the PLC master station B are communicated by adopting optical fibers, so that hot standby redundant control of two CPU controllers is realized, and the hot standby switching function is realized; the first communication module A0 of the PLC master station A and the first communication module B0 of the PLC master station B are connected with the third communication module C0 of the substation C through a double-channel coaxial cable so as to realize information acquisition of all modules of the substation, and realize redundant control of a PLC control system. The specific implementation mode is as follows:
The control system adopts two sets of PLC control systems, namely a PLC master station A and a PLC master station B, the system structure and the hardware configuration of the PLC master station A are completely the same, the PLC master station A is provided with a power module A1, a power module A2, a first CPU module and a communication module A0, and a frame with sixteen slot openings and a protective coating is additionally arranged; the PLC master station B is provided with a sixteen-slot rack B, a power supply module B1, a power supply module B2, a second CPU module and a communication module B0.
The substation C is configured to comprise a frame with sixteen slots and a protective coating, a power supply module C1, a power supply module C2, a communication module C0, digital quantity output modules C4.1 and C4.2, digital quantity input modules C3.1 and C3.2, an analog quantity input module C5 and an analog quantity output module C6.
Their respective racks are powered by the power modules A1, A2 of the PLC master station a, the power modules B1, B2 of the PLC master station B, and the power modules C1, C2 of the substation C, respectively. A plurality of module slots are arranged on the rack of each master station. The first CPU module of the PLC master station A and the second CPU module of the PLC master station B are communicated by adopting an optical fiber a, so that the redundant control of the two CPU controllers is realized, and the hot standby switching function is realized; in the control, the redundant two CPU modules simultaneously play the same role.
When the PLC master station A is powered on firstly and the PLC master station A has no fault, the PLC master station A is a master controller, the PLC master station B powered on later is a slave controller, and after the slave controller is powered on, the PLC master station B automatically completes the synchronization process; after synchronization, all the contents in the first CPU module of the PLC master station A are crossly loaded into the second CPU module of the PLC master station B in real time, and the loading contents comprise online programming, online numerical value modification and the like. In the PLC control system, after the first CPU module of the PLC master station A executes the related flow, the results of all output instructions are output to the second CPU module of the PLC master station B. Because the communication module A0 of the PLC master station A and the communication module B0 of the PLC master station B are connected with the third communication module C0 of the substation C through the double-channel coaxial cable, the information acquisition of all modules of the substation is shared, the same authority is obtained from the PLC master station B, and the consistency of the input and output of the second CPU modules of the PLC master station A and the PLC master station B is ensured. If a certain task is executed, when the PLC system of the PLC master station A detects that the CPU module of the master controller fails, the failure signal is transmitted to the PLC system of the slave controller PLC master station B which operates normally, so that the HMI touch screen, the first PC 1 and the second PC 2 receive the alarm signal of the first CPU module of the master controller PLC master station A in time, and meanwhile, the second CPU module of the slave controller PLC master station B is immediately switched to the master controller to automatically take over and bear the task of the master controller. Therefore, the undisturbed switching of the system is realized, and the condition that data is lost or the system stops running is avoided.
(II) redundant power supply mode:
Each rack is provided with two redundant power supply modules for supplying power, and the PLC master station A, PLC master station B and the substation C are respectively provided with two power supply modules for supplying power to the PLC bottom plate. When the control system is in normal operation and any power module of one master station or one power module of one substation is in fault, the other power module continuously supplies power for all modules of the rack, and a redundant power supply mode of each master station and each substation of the control system is realized. The specific implementation mode is as follows:
Each rack is provided with two redundant power supply modules for supplying power, and the PLC master station A is provided with a power supply module A1 and a power supply module A2 for supplying power to a bottom plate of the PLC rack; the PLC master station B is provided with a power supply module B1 and a power supply module B2 for supplying power to the bottom plate of the PLC rack; the substation C is respectively provided with a power module C1 and a power module C2 for supplying power to the bottom plate of the PLC rack simultaneously.
In the normal operation process of the control system, if the power supply module A1 of the PLC master station A fails, the failure signal is transmitted to the PLC systems of the master controller PLC master station A and the slave controller PLC master station B which are in normal operation, so that the touch screen HMI, the first PC 1 and the second PC 2 timely receive the alarm signal of the power supply module A1 of the master controller PLC master station A, and meanwhile, the other power supply module A2 continuously supplies power to the frame of the PLC master station A and all modules thereof, and the normal power supply of all modules on the frame is ensured.
An example of a failure of the power module B2 of the PLC master B is now given: if the control system is in the normal operation process, when the power supply module B2 of the PLC master station B fails, the failure signal is transmitted to the normal operation master controller PLC master station A and slave controller PLC master station B in the PLC system, so that the touch screen HMI, the first PC 1 and the second PC 2 timely receive the alarm signal of the power supply module B2 of the master controller PLC master station B, and meanwhile, the other power supply module B1 continuously supplies power for the PLC master station B and all modules thereof, thereby ensuring that all modules on the rack are normally powered, and realizing a redundant power supply mode for each master station and each slave station of the control system.
Similarly, the substation C can completely realize redundant power supply to all modules on the rack, and ensures that the redundant power supply mode of each master station and each substation of the control system is realized.
(III) a redundant communication mechanism:
The first communication module A0 of the PLC master station A and the second communication module B0 of the PLC master station B communicate with the third communication module C0 of the substation C through a double-channel coaxial cable, so that redundant communication between the master station and the substation is realized;
The first CPU module of the PLC master station A and the second CPU module of the PLC master station B communicate with the touch screen HMI in a mixed communication mode of Ethernet and MB (MB+), so that redundant communication between the master station and the touch screen HMI is realized;
the first CPU module of the PLC master station A is communicated with the first PC 1 through the Ethernet, and the second CPU module of the PLC master station B is communicated with the second PC 2 through the Ethernet, so that redundant communication between the master station and the PC is realized.
And communication is established between the PLC master station A and the PLC master station B in an optical fiber mode, so that a hot standby control function is realized.
The specific implementation mode is as follows:
each rack provided by the invention is provided with a communication module and a CPU module, and the communication between the master station B and the substation C of the PLC master station A, PLC is realized through the communication port of the communication module. All communication modules are provided with two independent coaxial cable channels, and the communication modules can be connected with two independent links, so that redundancy of media and redundancy of the CPU module are realized.
The CPU modules of the PLC master station A and the PLC master station B are provided with the same communication port, and are provided with an Ethernet port, an RS232/485 serial port and an optical fiber communication port. The communication modules of the PLC master station A and the PLC master station B are provided with two independent 1# coaxial cable communication ports and 2# coaxial cable communication ports. And the PLC master station A and the PLC master station B establish communication with a third communication module C0 of the substation C through the double-channel coaxial cable, so that redundant communication between the PLC master station A and the substation C, PLC master station B and between the PLC master station B and the substation C is realized.
The communication module A0 of the PLC master station A and the communication module B0 of the PLC master station B are respectively connected with a branch TAB1 through a coaxial cable 1# and then enter the communication module 0 of the substation C, and the coaxial cable 1# of the substation C is connected with the branch TAB 1; the 2# coaxial cable channel of the communication module A0 of the PLC master station A and the 2# coaxial cable channel of the communication module B0 of the PLC master station B are split at the position of the splitter TAB2 through the 2# coaxial cable and then enter the 2# coaxial cable channel of the communication module 0 of the substation C.
In normal communication, both links function the same at the same time. When the communication link of the No. 1 coaxial cable fails, the failure signal is transmitted to a PLC system of a master controller PLC master station A and a slave controller PLC master station B which operate, so that the touch screen HMI, the PC1 and the PC2 can timely receive the failure signal of the communication link of the No. 1 coaxial cable, and meanwhile, the communication link of the No. 2 coaxial cable still plays a role in communication and control. Conversely, when the 2# coaxial cable communication link fails, the 1# coaxial cable communication link still plays a role in communication and control.
The CPU module A of the PLC master station A and the BCPU module B of the PLC master station are communicated with the touch screen HMI in a mixed network communication mode of Ethernet and RS232/485 serial ports, so that redundant communication between the master station and the HMI is realized, and the actual application requirements are met. The PLC main website ACPU module A gets into the concentrator HUB1 through the ethernet port and shunts, and the PLC main website BCPU module B gets into the concentrator HUB2 through the ethernet port and shunts, and the output of HUB1 and HUB2 respectively is the outgoing line of one way and shunts in the branching unit TAB4 department, then communicates with the net gape of HMI touch-sensitive screen. And the CPU module A, PLC of the PLC master station A and the CPU module of the master station B are shunted at the TAB3 through an RS232/485 serial port communication mode and then are communicated with the serial port of the HMI touch screen. In normal communication, two links communicate simultaneously to perform the same function. When the Ethernet communication link fails, the failure signal is transmitted to the PLC system of the master controller PLC master station A and the slave controller PLC master station B, so that the HMI touch screen, the first PC 1 and the second PC 2 can timely receive the Ethernet communication link failure signal, and the serial communication link still has communication and control functions. Conversely, when the RS232/485 serial communication link fails, the Ethernet communication link still plays a role in communication and control.
The first CPU module of the PLC master station A is communicated with the first PC 1 through the Ethernet, and the second CPU module of the PLC master station B is communicated with the second PC 2 through the Ethernet, so that redundant communication between the master station and the PC is realized. The first CPU module of the PLC master station A establishes communication with the second CPU module of the PLC master station B through an optical fiber port, and the hot standby communication function of the PLC master station A and the PLC master station B is realized.
Claims (8)
1. A PLC control system for dual power supply and communication of a speed regulator hydraulic system comprises a first PC (1), a second PC (2), a PLC master station A, PLC, a master station B, a substation C, a first HUB (HUB 1), a second HUB (HUB 2) and a touch screen HMI; the method is characterized in that: the PLC master station A comprises a power supply module A1, a first CPU module, a first communication module A0 and a power supply module A2;
the PLC master station B comprises a power supply module B1, a second CPU module, a second communication module B0 and a power supply module B2;
the substation C comprises a power supply module C1, a third communication module C0, a plurality of digital quantity input modules, a plurality of digital quantity output modules, at least one analog quantity input module, at least one analog quantity output module and a power supply module C2;
The third communication module C0 is respectively connected and communicated with the first communication module A0 of the PLC master station A and the second communication module B0 of the PLC master station B through a first double-channel coaxial cable and a second double-channel coaxial cable, and sends data to the CPU module of the master station in real time;
The touch screen HMI is respectively in communication connection with the first CPU module of the PLC master station A and the second CPU module of the PLC master station B through a first HUB (HUB 1) and a second HUB (HUB 2) by using Ethernet as transmission media, so that real-time data exchange between the touch screen HMI and the PLC master station A, PLC master station B is realized;
The first CPU module of the PLC master station A is in communication connection with the first PC (1) through the Ethernet, and the second CPU module of the PLC master station B is in communication connection with the second PC (2) through the Ethernet, so that redundant communication between the master station and the PC is realized;
the PLC master station A and the PLC master station B are in communication connection through an optical fiber (a);
the first CPU module of the PLC master station A and the second CPU module of the PLC master station B are communicated by adopting optical fibers (a), so that hot standby redundancy control of the two CPU modules is realized, and the hot standby switching function is realized;
The communication module adopts a channel with two RIO coaxial connectors, can automatically diagnose the dual-port memory and the LAN controller when power is applied, and can automatically diagnose and execute the check sum RAM address or data when in operation; the first communication module A0 and the second communication module B0 are provided with remote I/O head double-channel modules, and are respectively installed in the same backboard with the first CPU module and the second CPU module which are respectively controlled by the system, the RIO head is used for bidirectionally transmitting data between the CPU module and the RIO substation module, and the coaxial cable network is used for interconnecting the RIO head module and one or more RIO substation modules;
The third communication module C0 adopts a remote I/O substation dual-channel module for bi-directionally transmitting data between an I/O module installed on the same RIO substation backplane and a RIO header module installed in the CPU backplane through a coaxial cable network.
2. The PLC control system for dual power and communication of a governor hydraulic system of claim 1, wherein: the PLC master station A comprises a first rack with a plurality of slot openings, and a power module A1, a first CPU module, a first communication module A0 and a power module A2 are arranged on the first rack.
3. The PLC control system for dual power and communication of a governor hydraulic system of claim 1, wherein: the PLC master station B comprises a second rack with a plurality of slot openings, and a power module B1, a second CPU module, a second communication module B0 and a power module B2 are arranged on the second rack.
4. The PLC control system for dual power and communication of a governor hydraulic system of claim 1, wherein: the substation C comprises a third rack with a plurality of slot openings, and a power supply module C1, a third communication module C0, a digital quantity input module, a digital quantity output module, an analog quantity input module and an analog quantity output module are arranged on the third rack; and a power module C2.
5. The PLC control system for dual power and communication of a governor hydraulic system of claim 1, wherein: the first CPU module and the second CPU module adopt built-in Ethernet coprocessors, and the processor in a standby battery power supply mode when power is off adopts a communication port at least provided with a Modbus port, a Modbus Plus port, a USB port and an Ethernet port and has a hot standby offline checking logic function.
6. A method for redundant control of a PLC control system for dual power and communication of a governor hydraulic system as defined in claim 1, wherein: the first CPU module of the PLC master station A and the second CPU module of the PLC master station B are communicated by adopting optical fibers, so that hot standby redundant control of two CPU controllers is realized, and the hot standby switching function is realized; the first communication module A0 of the PLC master station A and the first communication module B0 of the PLC master station B are connected with the third communication module C0 of the substation C through a double-channel coaxial cable so as to realize information acquisition of all modules of the substation, and realize redundant control of a PLC control system.
7. A redundant power supply method for a PLC control system for dual power and communication of a governor hydraulic system as defined in claim 1, wherein: each rack is provided with two redundant power supply modules for supplying power, and the PLC master station A, PLC master station B and the substation C are respectively provided with two power supply modules for supplying power to the PLC bottom plate; when the control system is in normal operation and any power module of one master station or one power module of one substation is in fault, the other power module continuously supplies power for all modules of the rack, and a redundant power supply mode of each master station and each substation of the control system is realized.
8. A method of redundant communication for a PLC control system for dual power and communication of a governor hydraulic system as defined in claim 1, wherein: the first communication module A0 of the PLC master station A and the second communication module B0 of the PLC master station B communicate with the third communication module C0 of the substation C through a double-channel coaxial cable, so that redundant communication between the master station and the substation is realized;
The first CPU module of the PLC master station A and the second CPU module of the PLC master station B communicate with the touch screen HMI in a mixed communication mode of Ethernet and MB (MB+), so that redundant communication between the master station and the touch screen HMI is realized;
The first CPU module of the PLC master station A is communicated with the first PC (1) through the Ethernet, and the second CPU module of the PLC master station B is communicated with the second PC (2) through the Ethernet, so that redundant communication between the master station and the PC is realized;
and communication is established between the PLC master station A and the PLC master station B in an optical fiber mode, so that a hot standby control function is realized.
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| CN112099394A (en) * | 2020-08-19 | 2020-12-18 | 江苏徐工工程机械研究院有限公司 | Engineering machinery controller and power supply protection method thereof |
| CN113341873B (en) * | 2021-08-06 | 2021-11-12 | 武汉中导光电设备有限公司 | Motion platform control system and control method of optical detection equipment |
| CN113985800A (en) * | 2021-09-30 | 2022-01-28 | 中国船舶重工集团公司第七一八研究所 | Control system of PLC system expansion IO sub-station based on Ethernet communication |
| CN114895622A (en) * | 2022-05-11 | 2022-08-12 | 中铁隧道局集团有限公司 | Underground low-temperature low-humidity special-reservoir cave depot environment control system |
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