Mitsubishi Electric MELSEC iQ-F FX5 Series User Manual page 145

When communication is unstable
When cyclic transmission delay time is long or when a transient transmission timeout occurs, check the following items.
Check item
Is the L ER LED of the Motion module turned on?
Is the ambient temperature for the module outside the specified range?
Is any error shown in "Selected Station Communications Status Monitor" of
CC-Link IE TSN/CC-Link IE Field diagnostics?
Is there any noise affecting the system?
When communication with an SLMP-compatible device cannot be performed
When communication with an SLMP-compatible device cannot be performed, check the following items.
Check item
Has the connection with the external device been opened normally?
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?
Is the same communication speed set for the connected device and access
destination?
*1 If the connection of only the external device is closed due to 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 number.
Action
Perform troubleshooting to be performed when the L ER LED turns on. (
Page 126 When the L ER LED turns on)
Keep the ambient temperature within the specified range by taking action
such as removing heat source.
If an error occurs, perform a cable test.
Change the installation of the modules and wiring so that the system is not
affected by noise.
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 to be sent.
If the external device did not send a command, send a command to this
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.
Change the connection destination so that the connected station and the
access destination have the same communication speed, and execute
communication.
8.4 Troubleshooting by Symptom
8 TROUBLESHOOTING
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