Mitsubishi Electronics A1SJ71AR23Q User Manual
8
TROUBLESHOOTING
8.3 Checking Error with LEDs of Link Module on Faulty Station
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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)
(Cyclic redundancy
check)
ON
Code check error of receive data
<Cause>
•Data-sending station was disconnected at the timing.
•Cable fault, noise, etc.
<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
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.
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.
<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.
<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
<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
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
Adjacent station was powered OFF.
<Cause> Reverse loop cable disconnection, or incomplete cable connection