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10 TROUBLESHOOTING
10.4 Troubleshooting by Symptom
When communication with an SLMP-compatible device cannot be performed
When communication with an SLMP-compatible device cannot be performed, check the following items.
*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.
If the above actions do not solve the problem, perform the module communication test to check for hardware failure. (
Page 200 Module communication test)
When the time synchronization does not operate for the control CPU of a local station
When the time synchronization does not operate for the control CPU of a local station, check the following items.
Check item Action
Has the connection with the external device been opened normally? • If the connection with the external device is not opened, perform the open
processing.
*1
• If an error occurs, check and eliminate the error cause.
Is the correct command format used for the command type, device
specification, address specification, and others?
Correct the command to be sent.
Did the external device send a command? If the external device did not send a command, send a command to this
module.
Was a response returned to the device that had sent the command? • 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.
Is the same communication speed set for the connected device and access
destination?
Change the connection destination so that the connected station and the
access destination have the same communication speed, and execute
communication.
For firmware version "1.002" or earlier
When communicating in multicast mode, is an Ethernet device connected to
the master station?
• Connect the Ethernet device to the local station or remote station
supporting the multicast filter.
• Set unicast mode.
• Take actions so that the Ethernet device does not receive multicast cyclic
data.
In multicast mode, is an Ethernet device connected to a local station or remote
station that does not support the multicast filter?
• Connect the Ethernet device to the local station or remote station
supporting the multicast filter.
• Set unicast mode.
• Take actions so that the Ethernet device does not receive multicast cyclic
data.
In multicast mode, are a local station and an Ethernet device connected on
the end side using an industrial switch?
• Configure settings with the industrial switch 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 Ethernet device.
• Check the connected device and do not connect a local station and an
Ethernet device on the end side via the industrial switch.
• Set unicast mode.
• Take actions so that the Ethernet device does not receive multicast cyclic
data.
Check item Action
Has the clock data been changed by the clock function of the CPU module? Check the clock function of the CPU module to see if the clock data has been
changed.
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