Verify whether the physical quantity configured for the corresponding channel in the AO group is correct.

Check whether the voltage/current range selected by the DIP switches on the main control board matches the current configuration. A 4-20 mA signal is recommended for long-distance transmission.

Check whether the input analog signal fluctuates, and calibrate the input channel using the parameters in Group P5 if necessary.

Check whether the AO module has an unstable power supply or shares a common ground with other equipment. The AO module must be grounded independently.

Use shielded twisted-pair cables for AO signal wiring. Ground the shielding layer and route the signal cables separately from high-voltage power cables.