FM171B HollySys Output Module, Shanghai Sijian Intelligent Technology Co., Ltd. is engaged in technical development, technical consultation, technical transfer in the fields of intelligent technology, information technology, and automation technology, as well as the sales of electrical equipment, automation equipment, electronic products, communication products, and electromechanical products. Industrial automation products: PLC, DCS, sensors, frequency converters, encoders, relays, servo drives, soft starters, touch screens. Brands involved in the products include: Eurotherm, Schneider, Siemens, ABB, SICK, P+F, E+H, Yokogawa, Yamakawa, Mitsubishi, Emerson, Honeywell, FANUC, GE, Eaton Electrical, CT
HollySys HollySys Module FM Series FM171B
I. FM171B HollySys Output Module, PLC Cabinet Wiring     · Power lines, control lines, and the power and I/O lines of the PLC should be wired separately; double-insulated wires should be used to connect the isolation transformer to the PLC and I/O. Separate the PLC's I/O lines and high-power lines; if they must be in the same conduit, bundle AC and DC lines separately. If conditions permit, it is best to run them in separate conduits, which not only maximizes the spatial distance but also minimizes interference to the lowest extent.
The PLC should be kept away from strong sources of interference such as welding machines, high-power silicon rectifiers, and large power equipment, and should not be installed in the same switch cabinet as high-voltage electrical devices. Inside the cabinet, the PLC should be kept away from power lines (the distance between them should be greater than 200mm). Electrical loads installed in the same cabinet as the PLC, such as the coils of high-power relays and contactors, should be connected in parallel with RC arc suppression circuits.
The inputs and outputs of the PLC should be wired separately, and switch and analog signals should also be laid out separately. Analog signal transmission should use shielded cables, with the shield grounded at one or both ends; the grounding resistance should be less than 1/10 of the shield resistance.     · Do not use the same cable for AC output lines and DC output lines; output lines should be kept as far away as possible from high-voltage lines and power lines, avoiding parallel runs.
II. I/O Terminal Wiring     1. Input Wiring  Input wiring should generally not be too long. However, if environmental interference is low and voltage drop is not significant, input wiring can be appropriately longer. · Input and output lines should not use the same cable; input and output lines must be separated. · Whenever possible, use normally open contacts to connect to the input terminals, so that the programmed ladder diagram matches the relay schematic, making it easier to read.
2. Output Connection    Output terminal wiring is divided into independent output and common output. In different groups, different types and voltage levels of output power can be used. However, outputs within the same group must use the same type and voltage level of power supply. · Since the output components of the PLC are encapsulated on the printed circuit board and connected to the terminal board, if the load connected to the output components is short-circuited, the printed circuit board will be burned out. When using relay outputs, the magnitude of the electrical load borne will affect the service life of the relay. Therefore, the electrical load should be reasonably selected, or an isolation relay should be added. The output load of the PLC may generate interference, so measures should be taken to control it, such as freewheeling diode protection for DC outputs, RC absorption circuits for AC outputs, and bypass resistor protection for transistor and triac outputs.