91
PROGRAMMING EXAMPLES
8
8.10 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.
(2) Operating and handling instructions
1) Command only from the PLC can be accepted during operation from CC-Link communication.
The run command from external and parameter unit is ignored.
2) If the station number set to different inverters is not the same, wrong data will be transferred and
normal communication cannot be made.
3) The inverter is brought to an alarm stop "E.OP1" or "E.OP3" if data communication stops for more
than the time set in
Pr. 500 Communication error recognition waiting time
due to a PLC fault, an open
CC-Link dedicated cable etc. during CC-Link operation.
TO instruction
Write completion
TO instruction
Write completion
Correct
Incorrect
