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11-6
Chapter 11. Maintenance and Troubleshooting
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Function alarm
The following shows the possible cause and corrective action for each function
alarm.
Function alarm
Cause
Corrective action
Loop1 PV
Loop1 RSP
Loop2 PV
Loop2 RSP
Loop3 PV
Loop3 RSP
Loop4 PV
Loop4 RSP
Analog input is out of range.
Adjust the analog input to within the
high and low range.
Wiring of analog input is incorrect.
Sensor or wiring is disconnected.
Signal generator has failed.
Check the sensor, signal generator,
and wiring, and fix if necessary.
Analog input setting is incorrect.
Check the analog input setting, and
fix if necessary.
Analog input circuit has failed.
Request repair or replacement of the
block.
MEMORY DIAGNOSIS
Internal memory error was detected. Request repair or replacement of the
main body or block.
CT/VT (AO-C)
CT input or VT input exceeds the
high limit.
Reduce the CT input or VT input to
less than the high limit.
CT input circuit or VT input circuit has
failed.
Request repair or replacement of the
block.
CT (V-P)
CT input exceeds the high limit.
Reduce the CT input to less than the
high limit.
CT input circuit has failed.
Request repair or replacement of the
block.
BLOCK DIAGNOSIS
Block is pulled off or nearly pulled off. Insert the block again.
Block has failed.
Request repair or replacement of the
block.
A block type that does not match the
model No. was inserted.
Request repair or replacement of the
block.
DO OVERCURRENT
Overcurrent of DO was detected.
Check and correct the loads and
wiring.
SD CARD
There is not enough space on the
microSD memory card.
Delete files from the microSD
memory card.
The microSD memory card is faulty.
Replace the microSD memory card.
CDS was started without the microSD
memory card inserted.
Turn OFF CDS, insert the microSD
memory card, and then start CDS
again.
BATTERY
Low battery or dead battery was
detected.
Replace the CLOCK block with a new
one.
USER-DEFINED ALARM 1
USER-DEFINED ALARM 2
USER-DEFINED ALARM 3
USER-DEFINED ALARM 4
Among the statuses set for
Assignment 1 to Assignment 4 of the
user-defined alarms, at least one of
them is 1 (ON).
Ensure that all the statuses set for
Assignment 1 to Assignment 4 of the
user-defined alarms are 0 (OFF).