4.7.10 Instructions - Mitsubishi Electric FR-E720-0.1KNC Instruction Manual

Programming examples

4.7.10 Instructions

(1) Programming instructions
⋅ 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.
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
Correct
Write completion
(2) Operating and handling instructions
⋅ Commands only from the programmable controller can be accepted during operation from CC-Link communication.
Operation commands from the operation panel are ignored.
If different devices have the same station number, data is transmitted improperly, and the communication cannot be
⋅
performed properly.
The inverter trips with the fault "E.OP1" if data communication stops for more than the time set in Pr. 500 Communication
⋅
error execution waiting time due to a programmable controller fault, an open CC-Link dedicated cable, etc. during CC-Link
operation.
If the programmable controller (master station) is reset during CC-Link operation or if the programmable controller is
⋅
powered OFF, data communication stops and the inverter trips with fault "E.OP1".
To reset the programmable controller (master station), choose the operation mode other than Network operation mode
beforehand.
(3) Troubleshooting
1) Operation mode does not switch to the Network operation mode
Check that CC-Link dedicated cable is fitted properly. (Check for contact fault, break in the cable, etc.)
⋅
⋅ Check that Pr.542 Communication station number (CC-Link) is set correctly. (Check that the station number matches the
program, the station numbers are not repeated, and the station number is not outside the range.)
Check that the operation mode switching program is running.
⋅
⋅ Check that the operation mode switching program has been written correctly.
2) Inverter does not start in the Network operation mode
⋅ Check that the inverter starting program has been written correctly.
⋅ Check that the inverter starting program is running.
74
TO instruction
Incorrect
Write completion