Mitsubishi Electric RD78G4 User Manual page 70

When communications using the SLMP cannot be performed
When communications using the SLMP cannot be performed, check the following items.
Check item
Has the connection with the external device been opened?
Is the correct command format used for the command type, device
specification, address specification, and others?
Did the external device send a command?
Was a response returned to the device that had sent the command?
If the above actions do not solve the problem, perform the module communication test to check for hardware failure. (
Page 53 Module Information List)
*1 If the connection of only the external device is closed due to communication cable disconnection, personal computer restart, or other
reasons, reopen the connection using the same port used before the error occurred. A connection is not closed if another Active open
request is received from the external device with a different IP address or a port No..
When communications with Ethernet devices cannot be performed
When communications with Ethernet devices cannot be performed, check the following items.
Check item
Is the firewall or proxy server setting enabled on the Ethernet device?
Is the antivirus software on the Ethernet device blocking the communication?
For details about when communication of the engineering tool is not allowed in the settings of Windows Firewall, refer to the
following.
 GX Works3 Operating Manual
3 TROUBLESHOOTING
68
3.4 Troubleshooting by Symptom
Action
• If the connection with the external device is not opened, perform the open
*1
processing.
• If an error occurs, check and eliminate the error cause.
Correct the command format. ( SLMP Reference Manual)
If the external device did not send a command, send a command to the
Motion module.
• If no response was returned, check if the correct IP address was specified
in the command. If not, correct the IP address and send the command
again.
• If a response was returned, check the end and error codes to correct the
faulty area.
Action
Check and correct the settings on the Ethernet device.
Is a response to the Ping command (ICMP echo request) disabled?
Check and correct the antivirus software settings on the Ethernet device.
• Is the security setting level of the antivirus software low?
• Is a response to the Ping command (ICMP echo request) disabled in the
firewall settings?