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Schneider M340 PLC and frequency converter guide - the Modbus communication
2, M340 hardware configuration double click on the CPU serial port, open to the Modbus Master configuration
configure a serial port for Modbus Master station, communication parameter setting in the Settings and ATV71 frequency converter, the following table:
set after clicking the confirm button to confirm. 3, program according to the following instructions to define READ_VAR
after the input respectively in the steps of the 3-2-1 click OK to confirm the input, and inserted in the ladder diagram READ_VAR block
in the same way that you can enter WRITE_VAR block parameters is slightly different, that is as follows:
after the parameter Settings module inserted below:
time token: in order to realize the system scalability, allow with multiple frequency converter, and the best in each PLC controller scan cycle can have eight communication module ( READ_VAR / WRITE_VAR) Active in communication at the same time, to control multiple frequency converter, need to time-sharing control of frequency converter, set the time here is the token is in order to make multiple inverter turns communication description variable
ladder diagram program
each converter has a unique time makes the brand, only in the current time token is equal to the time the token of the frequency converter, communication will be allowed to activate.
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