Chapter 8 Troubleshooting Procedure
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Chapter 8 Troubleshooting Procedure
This chapter describes the errors that occur during the use of XGB PLC and the built-in positioning function, the
method of finding the cause of the error, and the actions to take.
8.1 Basic Procedure of Troubleshooting
Although t is important to use a highly reliable device for normal operation of the system, it is important as
well how to deal with a trouble quickly.
In case of a trouble, if you want to restart the system, it is critical to find the cause of the trouble and take an
action as soon as possible. The basic troubleshooting points you need to keep in mind are as follows.
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1) Check with Naked Eye
Check the following with your naked eye.
• Operation of the machine (in motion, not in motion)
• Power supply – whether the rated voltage is normally supplied to XGB PLC
• Condition of the input and output devices
• Distribution (input and output lines, communication cables, expansion)
• Check the Indicators (PWR LED, RUN LED, STOP LED, input and output LED), and access the
peripheral devices to check the PLC operation and program contents.
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2) Trouble Check
When you manipulate the device as follows, observe how the trouble develops.
• Turn the operation mode switch to STOP and turn On / Off.
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3) Supposition of the Cause of Trouble
Suppose which of the following the cause of the trouble is.
• Whether the cause is in the PLC or an external device
• If the trouble is in the PLC, decide whether it is the trouble of the basic unit or other expansion modules.
• In the former is the case, decide whether there is a problem with the PLC parameter/program or
hardware.
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