Mitsubishi Electric MELSEC iQ-R Series User Manual page 169

SLMP communications failed
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?
Is the same communication speed set for the connected device and access
destination?
In multicast mode, is a standard Ethernet device connected to a local station
or remote station that does not support the multicast filter?
In multicast mode, are a local station and an Ethernet device connected on
the end side via a switching hub?
*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.
The control CPU of the local station cannot be synchronized time
When the time synchronization does not operate for the control CPU of a local station, check the following items.
Check item
Is the daylight savings time set to CPU modules different between the master
station and local stations?
Has the clock data been changed by the clock function of the CPU module?
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.
Change the connection destination so that the connected device and access
destination have the same communication speed.
• Connect the standard Ethernet device to a local station or remote station
that supports the multicast filter.
• Set unicast mode.
• Take actions so that the Ethernet device does not receive cyclic data in
multicast mode.
• Configure settings with the switching hub so that the multicast frame (with
multicast MAC address 09:00:70:00:10:02 and 09:00:70:00:10:05) will not
be transferred to the port of the standard Ethernet device.
• Check the connected device and do not connect both a local station and an
Ethernet device on the end side of the switching hub.
• Set unicast mode.
• Take actions so that the Ethernet device does not receive cyclic data in
multicast mode.
Action
Set the same daylight savings time to the CPU modules of the master station
and local stations.
Check whether the clock data has been changed by the clock function of the
CPU module.
4.4 Troubleshooting by Symptom
4 TROUBLESHOOTING
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