输出联接：输出端接线分为独立输出和公共输出。在不同组中，可选用不同类型和电压等级的输出电压，但在同一组中的输出只能用同一类型、同一电压等级的电源。由于PLC的输出元件被封装在印制电路板上，并且联接至端子
端子一般指由铜材等冲制而成的联接器接触件。端子是联接电气线路的常用元件，首要在器材与组件、组件与机柜、系统与子系统之间起电联接和信号传递的作用，并且尽量保持系统与系统之间不发作信号失真和能量丢掉的改变.
板，若将联接输出元件的负载短路，将焚毁印制电路板。选用继电器输出时，所承受的电感性负载的大小，会影响到继电器的运用寿命，因此，运用电感性负载时应合理挑选，或加隔绝继电器。PLC的输出负载或许发作烦扰，因此要采用办法加以控制，如直流输出的续流管保护，交流输出的阻容吸收电路，晶体管
Input wiring: input wiring is generally not too long. However, if the environmental disturbance is small and the voltage drop is not large, the input wiring can be appropriately longer; Input / output lines cannot use the same cable, and input / output lines should be separated; The normally open contact mode may be used to connect to the input end as far as possible, so that the ladder diagram compiled is consistent with the relay schematic diagram, which is easy to read.
Output connection: the output terminal wiring is divided into independent output and common output. In different groups, the output voltage of different types and voltage levels can be selected, but the output in the same group can only use the power supply of the same type and voltage level. Since the output components of PLC are encapsulated on the printed circuit board and connected to the terminal
The terminal generally refers to the connector contact made of copper, etc. Terminals are commonly used components for connecting electrical circuits. They mainly play the role of electrical connection and signal transmission between equipment and components, components and cabinets, and systems and subsystems, and try to keep the changes of signal distortion and energy loss between systems
If the load connecting the output components is short circuited, the printed circuit board will be burned. When selecting the output of the relay, the size of the inductive load it bears will affect the service life of the relay. Therefore, when using the inductive load, it should be reasonably selected or isolated relay should be added. The output load of PLC may be disturbed, so measures should be taken to control it, such as freewheeling protection of DC output, resistance capacitance absorption circuit of AC output, and transistors
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