Omron C120 System Manual page 90

Self-diagnosis
7-1 Self-diagnosis
7-1-1 C120, C500, C1000H, and C2000H Systems
Errors Before Operation
Programming Console Display
Error
Error code
SR bits
CPU LEDs
LEDs on Master Slave LEDs
Trans/ Test Termi- Trans/
nator
Error OK Error
check
flash -- lit --
lit -- -- --
lit -- -- --
flash -- -- not lit
not lit not lit not lit --
flash -- -- --
Non-fatal Errors
Programming Console Display
Error
Error code
SR bits
CPU LEDs
LEDs on Master Slave LEDs
Trans/ Test Termi- Trans/
nator
Error OK Error
check
lit -- -- lit
lit -- -- not lit
76
C-series Systems have self-diagnostic features to aid in the event of an error.
These features are divided into hardware diagnosis and system diagnosis. In
either case, the error message or FAL number is read through the Programming
Console. Some errors are also monitored by SR bits and can be programmed for
indication by an external alarm. The SR bits can also be programmed to stop PC
operation in the event of specific errors. Refer to the Troubleshooting Charts on
the following pages.
The following tables are in pairs. The first one of each pair classifies the errors
according to Programming Console displays and CPU LEDs. The second one of
each pair provides details on possible causes and corrections according to Re-
mote I/O Unit LEDs.
CPU Waiting
Waiting for remote power
---
For Transfer error in I/O bus.
Power: lit
Run: not lit
Optical I/O I/O
Unit LEDs Link
Unit
LEDs
I/O Power Trans/ Trans/
error Error Error
-- -- -- --
-- -- -- --
lit -- -- --
not lit lit not lit not lit
-- -- -- --
-- lit -- --
Remote I/O err
Remote I/O errors
B0 to B3 (other than C1000H, C2000H) B0 to B7 (C1000H, C2000H)
For all Remote I/O errors
Power: lit
Alarm: lit
Optical I/O I/O
Unit LEDs Link
Unit
LEDs
I/O Power Trans/ Trans/
error Error Error
-- lit lit lit
not lit -- not lit not lit
6112 ON (other than C1000H, C2000H)
25312 ON (C1000H, C2000H)
Cause
Remote I/O Unit power OFF
I/O bus line break
No terminator
Transfer error in I/O bus
Remote I/O bus error
Remote I/O Unit error
Slave unit number error
6112 ON (other than C1000H, C2000H)
25312 ON (C1000H, C2000H)
Cause
Transfer error in I/O bus
I/O bus line break
Remote power OFF or CPU error
Section 7-1
Correction
Apply power to the Unit
Check settings beginning with
terminator and check word set- terminator and check word set-
tings.
Check Remote I/O Units.
Replace Master.
Correct Slave unit number set-
ting.
Correction
Refer to 7-2 SR and AR Area
Flags to locate the error. The
System will automatically be re- System will automatically be re-
stored upon correcting the error.