User`s manual

8-4
RUN
(Power supply module)
OFF ○
OFF ○
Blink ◎
ON ●
ON ●
FLT
(Control module)
ON ●
OFF ○
OFF ○
OFF ○
ON ●
Remarks
Detectable error for self-diagnosis
Power supply OFF
Halt mode
Disable detection error by self-
diagnosis (input related)
Disable detection error by self-
diagnosis (output relatde)
Others
→ Check flow1
→ Check flow2
→ Check flow3
→ Check flow4
→ Check flow5
→ Check flow1
8-2 Troubleshooting
In the event of abnormality, check the LED (RUN) of the power supply module and the LED (FLT) of the
control module (=>[1]), and remedy according to the check flow (=>[4]) depending on the state.
[1] State of LED
[2] Precondition of check flow
This check flow describes the countermeasure method (replacement of defective module and
subsequent restoring method) in the event the system running normally so far suddenly breaks down.
Therefore, the following cases are excluded.
1. Trouble due to error in initial setting when starting up the system (system memory, parameter,
setting switch, etc.).
2. Momentary failure due to transient abnormality due to noise or other effect (irreproducible trouble).
3. Trouble due to effect of ladder program (customer's application).
If you cannot recover the JW300 after your treatment by referring to the check flows, or want to
request repair of a faulty module, contact our local dealers.
[3] Prepare for causing trouble
1. Be sure to keep back-up for program memory, system memory, and parameter memory.
When the control module is abnormal, the current program memory and the like may not be saved
by the support tool, or the saved data may be incorrect. Therefore, store the latest program memory
and back-up of system memory .
In the case of ROM operation, store the back-up, too.
2. Prepare for support tool at hand
Prepare the support tool that can load/save of hand-held programmer or program.
3. Prepare for spare parts
Prepare always a spare of each module to be ready for abnormality.
4. Prepare for "setting SW, setting system memory, I/O relay allocation table" of each module
For prompt troubleshooting, prepare the "switch setting table and I/O relay allocation table" of each
module.
*Prepare also the "parameter setting table" in the module, which requires setting of parameter
aside from switches, such as special I/O module and option module.