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PROGRAMMING EXAMPLES
45
6.11 Instructions
(1) Programming instructions
1) Since the buffer memory data of the master station is kept transferred (refreshed) to/from the inverters, the TO
instruction need not be executed every scan in response to data write or read requests.
The execution of the TO instruction every scan does not pose any problem.
2) If the FROM/TO instruction is executed frequently, data may not be written reliably.
When transferring data between the inverter and sequence program via the buffer memory, perform the handshake to
confirm that data has been written without error.
TO instruction
Write completion
Incorrect
TO instruction
Write completion
Correct
(2) Operating and handling instructions
1) During CC-Link operation, the inverter only accepts commands from the PLC and ignores any external operation
command and any operation command from the parameter unit.
2) If the same station number is set to different inverters, wrong data will be transferred and normal communication
cannot be made.
3) The inverter is brought to any of the alarm stops "E.OPT" if data communication stops, even instantaneously, due to a
PLC fault, an open CC-Link dedicated cable etc. during CC-Link operation.
4) If the PLC (master station) is reset during CC-Link operation or if the PLC is powered off, data communication stops
and the inverter is brought to any of the alarm stops "E.OPT".
To reset the PLC (master station), switch the operation mode to the external operation once, then reset the PLC.