How to find the fault of PLC digital signal - Database & Sql Blog Articles

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1. Check the plc power supply and control power.
2. According to the fault phenomenon and the comprehensive analysis of the fault information provided by the central control room, it is important to check whether the start and stop conditions of the equipment and the soft and hard interlocking conditions have been met.
3. Check whether the contacts, contacts and other contacts of the components in the PLC control cabinet are intact, whether the logic control circuit is intact, and whether the wiring is loose.
4. Whether the I/O terminal line in the control station is loose, whether the control signal can be sent, and whether the signal insurance is blown.
5. For pressure, temperature or flow switch, verify that the actual value of the site has reached the operational requirements.
6. Check the correctness of each parameter setting for the on-site intelligent equipment or instrument, check the fault and alarm information.
7. Check the source of the fault of the field device. If the signal command is incorrect, it will inevitably lead to abnormal operation of the protection device.