6F8C0904 193
8.5 Troubleshooting
8
(5) When PC link protocol transmission fails
(a) Main station EN311
Start
End
Refer to the completion status and
eliminate the cause of the error.
Verify the slave station EN311
message transmission UDP port
number.
Note: There are separate send and
r
eceive ports that each have their own
message transmission UDP port
Is the USEND_T or
URCV_T instruction
completed ?
A response timeout
occurred ?
Error status --- 5052
No
No
Yes
Yes
1) Check the slave station IP address
and message transmission UDP
port number again.
2) Configure the router if there is a
router on the transmission line.
3) Check the network verification
items.
Is the slave station
port correct ?
No
Yes
Verify the slave station EN311
transmission destination IP address.
Is the transmission
destination IP address set
to that of the slave station
EN311 ?
No
Yes
No
Yes
Does a response come
to the slave station
EN311 ?
No
Yes
Is the error counter read out
from the RAS information
constant ?
RAS error counters: Alignment error
Short packet, CRC error
Confirm the status when the USEND_T
or URCV_T is not completed.
It is possible that there is an error on
the network itself. Check the network
verification items.
Is the station status
such that run +
is enabled ?
Set the station to run + message
transmission enabled using an
operating mode control request.
No
Yes
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