Checking Sequence Program; Checking The Communication Setting; Checking Absence/Presence Of Errors - Mitsubishi MELSEC iQ-F FX5 User Manual

Checking sequence program

With the channel number that uses N:N Network is specified in the instructions to be used in the inverter communication, non-
protocol communication and predefined protocol support function, some error may occurs. (Page 236 Combined Use of
Serial Communication)

Checking the communication setting

Verify that protocol type is "N:N Network". When the protocol type is not "N:N Network", communication will not function
correctly.(Page 24 Communication Setting)
After changing any communication setting, make sure to turn the PLC power from OFF→ON, or reset.

Checking absence/presence of errors

Verify that link errors have not occurred in the master station and slave stations. The error can be checked using the flags
specified below.
Serial communication error
■Error flags
If a communication error occurs in the N:N Network, the serial communication error flag turns ON.
Verify that the device specified in the table below is ON.
FX5 only
CH1 CH2
SM8500 SM8510
■Error codes
When the serial communication error flag turns ON, the error code is stored in the device specified in the table below.
FX5 only
CH1 CH2
SD8500 SD8510
The error code (hexadecimal) stored in the devices above are as follows.
FX5 only
CH1 CH2
7700H
For error code above is stored, refer to Page 37.
Precautions
Serial communication error does not turn OFF even if the communication comes back to normal. The devices turn OFF when
power is turned OFF→ON, STOP→RUN, reset or SM50 (Error Detection Reset Completion) is turned ON.
2 N:N NETWORK
36
2.8 Troubleshooting
FX3 Series
compatible
CH3 CH4 CH1
SM8520 SM8530 SM8063
FX3 Series
compatible
CH3 CH4 CH1
SD8520 SD8530 SD8063
FX3 Series
compatible
CH3 CH4 CH1
Name
CH2
SM8438 Serial communication error
Name
CH2
SD8438 Serial communication error
code
Descriptions
CH2
N:N Network parameter setting error
Descriptions
Turns ON when an error occurs in serial
communication.
Descriptions
When a serial communication error occurs,
the error code is stored.