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8
TROUBLESHOOTING
8.3 Checking Error with LEDs of Link Module on Faulty Station
8 - 14
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
PREPARATORY
PROCEDURES BEFORE
OPERATION
6
LINK DATA SEND/
RECEIVE PROCESSING
AND PROCESSING TIME
7
PROGRAMMING
8
TROUBLESHOOTING
8.3 Checking Error with LEDs of Link Module on Faulty Station
Any of the following LEDs will light up when an error occurs.
Table 8.1 ERROR LEDs
Indication Name
Error-
detected
status
Description
CRC
CRC error
(Cyclic redundancy
check)
ON
Code check error of receive data
<Cause>
•Data-sending station was disconnected at the timing.
•Cable fault, noise, etc.
OVER Overrun error
Received data were overwritten with another data received next due to delay in
loading.
<Cause> Hardware failure in receiving part of link module
AB.IF Abort invalid frame error
"1" has been received consecutively more than stipulated times.
Receive data length is shorter than stipulated length.
<Cause>
•Data-sending station was disconnected at the timing.
•Monitoring time too short, cable fault, noise, etc.
TIME Time check error
Data link monitoring time is over.
<Cause> Monitoring time too short, cable fault, noise, etc.
DATA Data check error
Data containing erroneous code have been received.
<Cause> Cable fault, noise, etc.
UNDER Underrun error
Internal processing of send data is not executed constantly.
<Cause> Hardware failure in sending part of link module
F.LOOP Forward loop error
Forward loop line has an error.
Adjacent station was powered OFF.
<Cause> Forward loop cable disconnection, or incomplete cable connection
R.LOOP Reverse loop error
Reverse loop line has an error.
Adjacent station was powered OFF.
<Cause> Reverse loop cable disconnection, or incomplete cable connection