8.10 Instructions - Mitsubishi Electric 800 Series Instruction Manual

8.10 Instructions

 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
 Operating and handling instructions
• Command only from the programmable controller can be accepted during operation from CC-Link communication.
Operation commands input from external devices or on the operation panel are ignored.
• If multiple inverters have the same station number, the communication cannot be performed properly.
• The inverter protective function (E.OP1) is activated if data communication stops for more than the time set in Pr.500
Communication error execution waiting time due to a programmable controller fault, a CC-Link dedicated cable
disconnection 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 protective function (E.OP1) is activated.
To reset the programmable controller (master station), switch the operation mode to the external operation once, then reset the
programmable controller.
• When Pr.340 = "0", any inverter whose main power is restored is reset to return to the external operation mode. To resume
the network operation, therefore, set the operation mode to the network operation using the programmable controller
program.
Set a value other than "0" in Pr.340 to start in the network operation mode after inverter reset. (Refer to
94
PROGRAMMING EXAMPLES
TO instruction
Incorrect
Write completion
page 34)