PLC commissioning needs to know
Commissioning is the key work to check whether the PLC control system can meet the control requirements and is an objective and comprehensive evaluation of the system performance. The system must be put into use after strict commissioning of the whole system function until it meets the requirements and is confirmed by the relevant user representatives, supervisors and design signatures before it is put into use. The commissioning personnel should have received special training on the system and be familiar with the composition of the control system, the use and operation of hardware and software. The commissioning staff should contact the relevant designers in time for any problems found during commissioning, and make changes only after the designers have agreed to do so, and make detailed records of the changes, and back up the modified software. And the debugging modification part of the good documentation and archiving. The debugging content mainly includes input and output functions, control logic functions, communication functions, processor performance testing, etc. Input and output circuit debugging 1, the analog input (AI) circuit debugging. To carefully check the address assignment of the I0 module; check whether the circuit power supply (internal or external power supply) is consistent with the field instrument; use the signal generator to add a signal to each channel at the field end, usually taking 0, 50% or 100% three points to check. For AI circuits with alarm and interlock values, the alarm and interlock values (such as high alarm, low alarm and interlock points as well as accuracy) should be checked to confirm the correctness of the alarm and interlock status. 2, analog output (AO) circuit commissioning. According to the requirements of the circuit control, manual output (i.e. set directly in the control system) can be used to check the actuator (e.g. valve opening, etc.), usually also taking 0, 50 % or 100 % of the three points to check; at the same time, through closed-loop control, check whether the output meets the relevant requirements. For AO circuits with alarm and interlock values, the alarm and interlock values (e.g. high and low alarm and interlock points and accuracy) are also checked to confirm the correctness of the alarm and interlock status. 3, switch input (DI) circuit commissioning. Short or disconnect the corresponding field end, check the change of the light-emitting diode of the corresponding channel address of the switching input module, and check the change of the channel on and off. 4, switch output (DO) circuit debugging. The output points can be checked by the forced function provided by the PLC system. By forcing, check the change of the light-emitting diode of the corresponding channel address of the switching output module, and check the change of the channel on and off at the same time. Note for circuit commissioning 1、For the switching input and output loops, attention should be paid to the principle ...
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