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Precautions
To obtain the maximum performance from the A/D conversion function and improve the system reliability, external wiring that
is noise resistant is required. Precautions for external wiring are as follows.
• Use separate cables for the AC control circuit and the external input signals of the analog input terminal to avoid effects of
the AC side surges or induction.
• Do not install cables near or bundle cables with any main circuit lines, high voltage lines, or load cables for equipment other
than the programmable controller. Doing so may cause the system to be susceptible to noise, surges, or induction.
• Ground shielded wires or shielded cables based on single-point ground. However, depending on the external noise
conditions, it may be better to ground them externally.
• If A/D conversion is enabled while terminals of unused channels are open, an undefined digital value may be output. To
prevent this, short-circuit the COM terminal and the input terminal (V or I) of the unused channels.
7 INSTALLATION AND WIRING
7.5 External Wiring
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Troubleshooting
