PLC input and output circuit debugging - Xinjie

Create Date: 2024-8-30 12:03:23|Source: XINJE

1. Analog input (AI) loop debugging. Carefully check the address assignment of the I0 module; Check whether the loop power supply method (internal or external) is consistent with the field instrument; Use a signal generator to check the participating signals of each channel at the field end, generally taking three points of 0, 50% or 100%. For AI loops with alarms and interlocking values, it is also necessary to check the alarm interlocking values (such as overreporting, underreporting, interlocking points and accuracy) to recognize the correctness of the relevant alarms and interlocking conditions.

                            PLC input and output circuit debugging - Xinjie

2. Analog output (AO) loop debugging. According to the requirements of circuit control, the actuator (such as valve opening, etc.) can be viewed by the method of manual output (i.e., directly set in the control system), and generally take 0, 50% or 100% three points to view; After closed-loop control together, check whether the output meets the relevant requirements. For AO loops with alarm and interlock values, it is also necessary to check the alarm interlock values (such as overreporting, underreporting, interlocking points and accuracy) to recognize the correctness of the relevant alarms and interlocking conditions.

3. Debugging of switching input (DI) circuit. Short or disconnect at the corresponding field terminal, check the change of the LED corresponding to the channel address of the switching input module, and check the on/off change of the channel together.

4. Debugging of switching output (DO) circuit. The output point can be viewed by the forced function provided by the PLC system. After compulsion, check the change of the LED of the corresponding channel address of the switching output module, and check the on-off change of the channel together.

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