输出接口电路向被控对象的各种执行元件输出控制信号。常用执行元件有接触器、电磁阀、调节阀(模拟量)、 调速装
置(模拟量)、指示灯、数字显示装置和报警装置等。输出接口电路一般由微电脑输出接口电路和功率放大电路组成，
与输入接口电路类似，内部电路与输出接口电路之间采光电耦合器进行抗干扰电隔离。
微电脑输出接口电路一般由输出数据寄存器、 选通电路和中断请求逻辑电路集成在芯片上, CPU通过数据总线将输出
信号送到输出数据寄存器中，功率放大电路是为了适应工业控制要求,将微电脑的输出信号放大。
3)其它接口
若主机单元的I/O数量不够用，可通过I/O扩展接口电缆与I/O扩展单元(不带CPU)相接进行扩充。PLC还常配置连接
各种外围设备的接口，可通过电缆实现串行通信、EPROM写入等功能。
2) Output interface
The output interface circuit outputs control signals to various actuators of the controlled object. Commonly used actuating elements include contactor, solenoid valve, regulating valve (analog quantity) and speed regulating device
Set (analog quantity), indicator light, digital display device, alarm device, etc. The output interface circuit is generally composed of microcomputer output interface circuit and power amplifier circuit,
Similar to the input interface circuit, the daylighting electric coupler between the internal circuit and the output interface circuit is electrically isolated against interference.
Microcomputer output interface circuit is generally integrated on the chip by output data register, gating circuit and interrupt request logic circuit, and the CPU outputs it through the data bus
The signal is sent to the output data register, and the power amplification circuit is to adapt to the requirements of industrial control and amplify the output signal of microcomputer.
3) Other interfaces
If the i/o quantity of the host unit is insufficient, it can be expanded by connecting the i/o expansion interface cable with the i/o expansion unit (without CPU). PLC is also often configured with connection
The interfaces of various peripheral devices can realize serial communication, EPROM writing and other functions through cables.
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