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8 TROUBLESHOOTING
8 TROUBLESHOOTING
8.1 Checking Items at Error Occurrence
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The chapter describes the troubleshooting methods to be taken when a fault occurs in
the QJ71AS92.
First check the QJ71AS92 as follows.
(1) Check "RUN" and "U ASI" LED.
•
If "RUN" LED of QJ71AS92 is off, check whether the power supply is supplied
to programmable controller.
•
If "U ASI" LED is off, check the current rating of AS-i power supply, wiring.
(2) Check "ERR." LED.
•
If the "ERR." LED of the QJ71AS92 is on, check the slave status and wiring.
•
Check the error code at the buffer memory address C0
action.
See Section 8.3 for the error codes.
(3) Check the external power supply for slave.
If this power supply capacity is not enough or miss-wiring is, the slave will not
normally operate.
(4) Check the total number of slaves.
•
The total number of slaves should be calculated according to the expression in
Section 3.1.
•
Check for overlapping slave addresses.
(5) Check whether slaves are configured as intended.
•
Check whether the slave are correctly connected.
•
Check the slave list that differs from the settings (buffer memory addresses:
1D
to 20
) and reexamine the corresponding slave.
H
H
(6) Check total extension distance
•
The total extension distance must not exceed 100m. However, when the
repeater is used, it is possible to extend the distance by 100m per repeater.
A maximum of two repeaters can be used in series.
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