In the development of hydraulic turbine governor, the MITSUBISHI CC-Link bus is used as the alternate channel between the two PLC:
The governor of the hardware configuration is mainly composed of two sets of identicalconfiguration PLC: the main board CC-Link bus Application, the power supply module CC-Link bus Application, CPU module Application, I/O input module, I/O output module, A/D module, D/A module, high-speed counter module, CC-Link communication module. Monitor screen adopts flat LCD computer (with touch screen), and communicate with CC-Link bus, and install PCI CC-link interface card A80BDE-J61BT13.
2.Implementation of data communication between pairs of PLC:
Any PLC system can be defined as a master station or a standby station, and the communication rate between PLC is 0Mbps. The station number is only set on the CC-Link module, and the 0 station is the master station. The communication method is as follows: the X point corresponding to the master station is the Y of the local station, for example, the output of the Y1000 point of the local station is the input of the main station's X2000. Corresponding to the same D register.
CC-Link module number: represents the number of CC-Link modules on the PLC substrate, and the governor adjuster has only one piece.
Starting I/O number: indicates the location of the CC-Link module mounted on the substrate. The regulator module is mounted on the eighth slot except the power module and the CPU module.
Type: does the CC-Link module define the system as a master station or a local station?. (relating to the station number switch settings on the module).
Total number of links: only in the main station need to set, due to the existence of B sets PLC (local station) and PCI CC-link card, so it is the 2 set of local stations.
Remote input (Rx) refreshes the soft components: set to m2000. Remote input (Ry) refreshes the soft components: set to m4000.
Remote input (RWr) refreshes the soft components: set to D1000. Remote input (RWw) refreshes the soft components: set to D2000.
Send number: when a communications failure, the retry again link. Station information specifies: when clicking on the station information, the following picture appears
The above communication failure judgment event is only 200ms. When the communication fails, the data will not be cleared, and the data before communication failure will be maintained. The local station due to the occupation of the 4 stations, each station to read and write data for the 4 and 32 I/O, the amount of data communication is 128 (32bit * 4) a variable and 16 (4Word * 4) a word variable, because it is not great exchange of real-time data in the control system volume. The exchange of data are: gateopening, unit residual voltage frequency, gear measuring frequency, unit power, real-time head, all the given value (a given frequency, opening, given the given power, opening limit and so on). As for the need for more data interchange capacity, flag bits are used. Such as: a variable bit1=0 when sending packets of DATA1_0 variable bit1=1 when sending data packets of DATA1_1.. Variable bitn=0 packets DATAn_0 variable bitn=1 when sending data packets due to DATAn_1 communication bit variable is n=128, the communication data (send and receive) DATA = 2 x 2 x 128 x 16 = 8192 WORD. The communication data can meet the requirements of the governor system.
6, because the CC-Link mode has the communication speed of 10Mbps, the data exchange of the two computers is synchronous basically, and it provides real-time data for the regulation of the hydraulic turbine. And this method is an open bus, with high reliability. The most valuable is that this method has a high cost performance, the right price, appropriate communication data, high communication rate, reliability and so on.