User`s manual

8-7
Control module Input module
Memory
I/F
circuit
Hand-held programmer
(3)
(3)
(2)
LED
(1)
Common terminal
Input terminal
(4) Check flow 4
This flow shows the checking procedure in the event of abnormality of input signal not detected by
the self-diagnosis of the control module.
Example of the error
• All inputs of specific input module fail to be turned ON.
• Specific input fails to be turned ON (OFF).
• Among input signals of a same input module, operation of a certain input signal affects other
input signal.
Countermeasure: Error input signal
(1) Measure the voltage between the corresponding input terminal of the input module and the
common terminal using a tester.
If supply voltage is applied between terminals: ON
If supply voltage is not applied between terminals: OFF
(2) Check the state of LED of input module.
(3) Connect hand-held programmer, and check ON/OFF by monitoring the data memory (input
relay) corresponding to the abnormal input.
In case of (1)=(2)=(3) Check the external wiring and power supply.
In case of the others Exchange the input module.
[The flow of input signal]