11 TROUBLESHOOTING
11.4 Examples of Troubles with the I/O Module
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11
An input signal does not turn on (AC input module).
■Cause
Around the zero cross voltage (1) of the input signal (AC), there are step-like deformations as shown below:
■Action
Improve the input signal waveform by using an on-line type UPS and others.
A signal incorrectly inputs data
■Cause
Noise is taken as input data.
■Action
Set a longer input response time.
Page 90 Input Response Time Setting Function
1ms5ms
If the issue still continues, take the following two actions.
• To prevent excessive noise, avoid installing power cables together with I/O cables.
• Connect surge absorbers to noise-generating devices such as relays and conductors using the same power supply or take
other noise reduction measures.
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