67
3.4.11 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 fail.
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 an alarm stop "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 or PLC power is switched off during CC-Link
operation, data communication stops and the inverter is brought to an alarm stop
"E.OPT".
5) Do not set "1" in Pr. 77 "write inhibit selection" of the inverter. If the CC-Link
mode is selected with this setting, all parameters will be write-disabled.
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