UFC762AE101 3BHE006412R0101采用常开触点形式

动力线、控制线以及plc的电源线和I/O线应分别配线，隔离变压器与PLC和I/O之间应采用双胶线连接。将PLC的IO线和大功率线分开走线，如必须在同一线槽内，分开捆扎交流线、直流线，若条件允许，分槽走线最好，这不仅能使其有尽可能大的空间距离，并能将干扰降到最低限度。

PLC应远离强干扰源如电焊机、大功率硅整流装置和大型动力设备，不能与高压电器安装在同一个开关柜内。在柜内PLC应远离动力线(二者之间距离应大于200mm)。与PLC装在同一个柜子内的电感性负载，如功率较大的继电器、接触器的线圈，应并联RC消弧电路。

PLC的输入与输出最好分开走线，开关量与模拟量也要分开敷设。模拟量信号的传送应采用屏蔽线，屏蔽层应一端或两端接地，接地电阻应小于屏蔽层电阻的1/10.

交流输出线和直流输出线不要用同一根电缆，输出线应尽量远离高压线和动力线，避免并行。

I/O端的接线

输入接线

输入接线一般不要太长。但如果环境干扰较小，电压降不大时，输入接线可适当长些。

输入/输出线不能用同一根电缆，输入/输出线要分开。

尽可能采用常开触点形式连接到输入端，使编制的梯形图与继电器原理图一致，便于阅读

输出连接

输出端接线分为独立输出和公共输出。在不同组中，可采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，并且连接至端子板，若将连接输出元件的负载短路，将烧毁印制电路板。

采用继电器输出时，所承受的电感性负载的大小，会影响到继电器的使用寿命，因此，使用电感性负载时应合理选择，或加隔离继电器。

PLC的输出负载可能产生干扰，因此要采取措施加以控制，如直流输出的续流管保护，交流输出的阻容吸收电路，晶体管及双向晶闸管输出的旁路电阻保护。

UFC762AE101 3BHE006412R0101采用常开触点形式

Power line, control line and plc power line and I/O line should be distributed separately, isolation transformer and PLC and I/O should be connected with double rubber wire. The PLC IO line and high-power line separate wiring, such as must be in the same line slot, separate tying AC line, DC line, if conditions permit, the best slot routing, which can not only make it have as much space distance as possible, and can reduce interference to a minimum.

PLC should be away from strong interference sources such as welding machines, high-power silicon rectifier devices and large power equipment, and can not be installed in the same switch cabinet with high-voltage appliances. The PLC should be far away from the power line in the cabinet (the distance between the two should be greater than 200mm). The inductive load installed in the same cabinet with the PLC, such as the relay with large power and the coil of the contactor, should be connected to the RC arc suppression circuit.

The input and output of PLC are best separated, and the switching quantity and the analog quantity should also be laid separately. The transmission of the analog signal should use a shielded wire, the shielding layer should be grounded at one or both ends, and the grounding resistance should be less than 1/10 of the resistance of the shielding layer.

Do not use the same cable as the AC output line and the DC output line. The output line should be as far away from the high voltage line and the power line as possible to avoid parallel.

I/O terminal cables

Input wiring

Generally, the input cable should not be too long. However, if the environmental interference is small and the voltage drop is not large, the input wire can be appropriately long.

Input/output cables cannot be the same cable. Input/output cables should be separated.

As far as possible, the normally open contact form is connected to the input end, so that the ladder diagram is consistent with the relay schematic diagram and easy to read

Output connection

The output terminal is divided into independent output and public output. In different groups, different types and voltage levels of output voltages can be used. However, the output in the same group can only use the same type of power supply and the same voltage level.

Since the output components of the PLC are packaged 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.

When the relay output is used, the size of the inductive load to be borne will affect the service life of the relay, therefore, the use of inductive load should be a reasonable choice, or add an isolated relay.

The output load of PLC may cause interference, so measures should be taken to control it, such as continuous current tube protection for DC output, resistance and capacitance absorption circuit for AC output, and bypass resistance protection for transistor and bidirectional thyristor output.