
PROGRAMMING EXAMPLES
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.
Correct | TO instruction |
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| Incorrect | TO instruction | |
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| Write completion |
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| Write completion |
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(2)Operating and handling instructions
1)During
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
4)If the PLC (master station) is reset during
To reset the PLC (master station), switch the operation mode to the external operation once, then reset the PLC.
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