GE 8910-PS-DC DC system power supply

GE 8910-PS-DC On site interface module

    With this input-output table, 8851-LC-MT for electricians who understand the operation process or are familiar with the ladder diagram of this equipment, maintenance can be carried out.

    But for electricians who are not familiar with the operation process and cannot read ladder diagrams, they need to draw another table: PLC input and output logic function table.

    8851-LC-MT this table actually illustrates the logical correspondence between the input circuit (triggering element, associated element) and the output circuit (executing element) in most operational processes.

    Practice has proven that if you can proficiently use the input-output correspondence table and input-output logic function table, 8851-LC-MT

    Repairing electrical faults can be done easily without drawings.

    The environment in industrial sites is relatively harsh, with many high and low frequency interferences. These interferences are generally introduced into the PLC through cables connected to on-site equipment. In addition to grounding measures, some anti-interference measures should be taken in the design selection and laying construction of cables:

    1. Analog signals belong to small signals and are highly susceptible to external interference. Therefore, double-layer shielded cables should be used;

    2. Shielded cables should be used for high-speed pulse signals (such as pulse sensors, counting codes, etc.) to prevent both external interference and low-level signal interference from high-speed pulse signals;

    3. The communication cable frequency between PLCs is relatively high, and the cables provided by the manufacturer should generally be used. In cases where the requirements are not high, shielded twisted pair cables can be used;

    4. Analog signal lines and DC signal lines cannot be routed in the same slot as AC signal lines;

    5. The shielded cables introduced and led out from the control cabinet must be grounded and directly connected to the equipment without going through wiring terminals;

    6. AC signals, DC signals, and analog signals cannot share the same cable. Power cables should be laid separately from signal cables.

    The methods to solve interference during on-site maintenance include: using shielded cables on the affected lines and re laying them; Add anti-interference filtering code to the program.

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