10.2.4 Diagnosing Output Malfunction
Proceed from the check of the output side to the check of the input side.
Check of output condition 1: Output indicator LEDs are on
Procedure 1
Check the wiring of the loads.
Procedure 2
Check if the power is properly supplied to the loads.
If the power is properly supplied to the load, there is probably an abnormality in the load. Check the
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load again.
If the power is not supplied to the load, there is probably an abnormality in the output section. Please
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contact your dealer.
Check of output condition 2: Output indicator LEDs are off
Procedure 1
Monitor the output condition using a programming tool.
If the output monitored is turned on, there is probably a duplicated output error.
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Procedure 2
Forcing on the output using forcing input/output function.
If the output indicator LED is turned on, go to input condition check.
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If the output indicator LED remains off, there is probably an abnormality in the output unit. Please
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contact your dealer.
Check of input condition 1: Input indicator LEDs are off
Procedure 1
Check the wiring of the input devices.
Procedure 2
Check that the power is properly supplied to the input terminals.
If the power is properly supplied to the input terminal, there is probably an abnormality in the input unit.
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Please contact your dealer.
If the power is not supplied to the input terminal, there is probably an abnormality in the input device or
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input power supply. Check the input device and input power supply.
Check of input condition 2: Input indicator LEDs are on
Procedure
Monitor the input condition using a programming tool.
If the input monitored is off, there is probably an abnormality with the input unit. Please contact your
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dealer.
If the input monitored is on, check the leakage current at the input devices (e.g., two-wire type sensor)
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and check the program again.
Check
(1) Check for the duplicated use of output. Check whether the output has been rewritten using the high-
level instruction.
(2)Check the program flow when a control instruction such as MCR or JMP is used.
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