Mitsubishi Electric 800 Series Function Manual page 44

(N) Operation via communication and its settings
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 CC-Link IE TSN communication.
The run command from external and parameter unit is ignored.
• If different 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, an open Ethernet cable etc.
during CC-Link IE TSN operation.
• If the programmable controller (master station) is reset during CC-Link IE TSN 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 (initial value)", 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.
 Troubleshooting
Description
Operation mode does not switch
to the Network operation mode
Inverter does not start in the
Network operation mode
Parameters referred to
Pr.37 Speed display, Pr.144 Speed setting switchover
Pr.811 Set resolution switchover
44
PARAMETER
Incorrect
Check that the Ethernet cable is installed correctly.(Check for contact fault, break in the cable, etc.)
Check if Pr.436 IP address 3 and Pr.437 IP address 4 are correctly set. (Check that their settings
match with the program, that the network number is set within the range, that no overlapping stations
exist, and that the station number is set within the range.)
Check that the inverter is in the External operation mode.
Check that the operation mode switching program is running.
Check that the operation mode switching program has been written correctly.
Check that the inverter starting program is running.
Check that the inverter starting program has been written correctly.
Check that Pr.338 Communication operation command source is not set to external.
Instruction Manual (Detailed) of the FR-A800 inverter
Instruction Manual (Detailed) of the FR-A800 inverter
TO instruction
Write completion
Check point