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

Checking the communication settings

CPU module communication settings
Verify that the protocol type is "Inverter Communication". If the communication settings are not "Inverter Communication",
communication will not function correctly. (Page 118 PLC Communication settings)
After changing communication settings, make sure to turn the PLC power from OFF→ON, or reset.
Checking inverter operation status
1.
When the operation mode of an inverter is not changed to computer link operation mode
• Verify that the inverter is set to the external operation mode.
• Verify that no signal is being input to the external terminals STF and STR.
• Verify that the correct change operation mode program is being executed.
2.
When an inverter cannot be started even in computer link operation mode
• Verify that the program for starting the inverter is executed correctly.
• Verify that the operation command rights and speed command rights are set correctly.
• Verify that the allowable communication time interval is set correctly.
3.
When an inverter is stopped by an alarm during operation due to defective communication
• Verify that a communication cable is connected correctly between the PLC and the inverter. (Check for poor contact or wire
breakage).
• Verify that a sequence program is created so that communication is executed with each inverter within a constant cycle. Set
the communication check time interval to a large value, and check the communication status.
• Verify that the allowable communication time interval is set correctly.
• Verify that termination resistors are set correctly.

Checking absence/presence of errors

If an inverter communication error occurs, it is processed as a serial communication error. (Page 124)
Serial communication error
■Error flags
The following devices turn ON when an error occurs during serial communication.
FX5 dedicated
CH1 CH2
SM8500 SM8510
■Error code
When the serial communication error turns ON, the error code is stored in the corresponding device specified in the table
below.
FX5 dedicated
CH1 CH2
SD8500 SD8510
The error code (hexadecimal) is below.
Error code (hexadecimal)
7010H
76**H
5 INVERTER COMMUNICATION
144
5.9 Troubleshooting
FX3 Series
compatible
CH3 CH4 CH1
SM8520 SM8530 SM8063
FX3 Series
compatible
CH3 CH4 CH1
SD8520 SD8530 SD8063
Name
CH2
SM8438 Serial communication error
Name
CH2
SD8438 Serial communication error
code
Description
Parity error, overrun error or framing error
Inverter communication error (Page 145)
Description
Turns ON when an error occurs in serial
communication.
Description
When a serial communication error occurs,
the error code is stored.