12
TROUBLESHOOTING
12.1 Troubleshooting Basics
12 - 1
9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
CHAPTER12 TROUBLESHOOTING
This chapter describes the various types of trouble that occur when the system is
operated, and causes and remedies of these troubles.
Refer to the following manual for the configuration of a redundant system
(when the Redundant CPU is used).
QnPRHCPU User's Manual (Redundant System)
12.1 Troubleshooting Basics
In order to increase the reliability of the system, not only highly reliable devices are used
but also the speedy startup of the system after the occurrence of trouble becomes an
important factor.
To start up the system speedily, the cause of the trouble must be located and eliminated
correctly.
The basic three points that must be followed in the troubleshooting are as follows.
(1) Visual inspection
Visually check the following.
1) Movement of sequencer (stopped condition, operating condition)
2) Power supply on/off
3) Status of input/output devices
4) Power supply module, CPU module, I/O module, intelligent function module,
installation condition of extension cable
5) Status of wiring (I/O cables, cables)
6) Display status of various types of indicators ("POWER" LED, "RUN" LED,
"ERR." LED, I/O LED)
7) Status of setting of various types of switches (Setting of No. of stages of
extension base unit, power interrupt hold-on status)
After checking 1) to 7), connect GX Developer and monitor the operating
condition and program contents of the programmable controller.
(2) Check of trouble
Check to see how the operating condition of the programmable controller varies while
the programmable controller is operated as follows.
1) Set the RUN/STOP switch
Note12.1
to STOP. Note1
2) Reset the trouble with the RESET/L.CLR switch.
Note12.1
( CHAPTER 4)
3) Turn ON and OFF the power supply.
Note1
Basic
Universal
UD
Note12.1
For the Basic model QCPU or Universal model QCPU use the "RUN/STOP/RESET switch" for
the operation.
Basic
Universal
UD
Note12.1
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