FOXBORO P0926JM 福克斯波罗I/A Series系统

FOXBORO P0926JM 福克斯波罗I/A Series系统

FOXBORO P0926JM 福克斯波罗I/A Series系统

PLC常见的输入元件有按钮、行程开关、接近开关、转换开关、拨码器、各种传感器等，输出设备有继电器、接触器、电磁阀等。正确地连接输入和输出电路，是保证PLC安全可靠工作的前提。

电，气，液等就相当于人的肌肉与神经，PLC发出指令，通过电，气，液等将能量传给机器，机器就执行。 传感器将外界情况反馈给PLC,就相当于人的眼，鼻等，将外界事物反馈给大脑。 也就是说拿一个人或者动物来打比方，PLC就是大脑，PLC跟机器的结合就相当于人的大脑跟躯体的结合，,只是人的大脑里面的程序比PLC要复杂得多，但是人的大脑的灵敏度及准确性不及PLC。

PLC开关量输出的有：

继电器输出：输出交直流都可以，电压范围宽，电流大，动作频率低，一般1Hz左右。

晶体管输出：只能输出直流，一般是30V以下，电流小，动作频率高，可达200KHz或更高。

晶闸管输出：只能输出交流，一般是60-450V，电流大，动作频率高，价格贵。

FOXBORO P0926JM 福克斯波罗I/A Series系统

The common input components of PLC are buttons, stroke switches, proximity switches, transfer switches, dip switches, various sensors, etc., and the output equipment has relays, contactors, solenoid valves, etc. The correct connection of input and output circuits is the premise of ensuring the safe and reliable operation of PLC.

Electricity, gas, liquid, etc. is equivalent to human muscles and nerves, PLC issues instructions, through electricity, gas, liquid, etc. to transmit energy to the machine, and the machine executes. The sensor feeds the external situation to the PLC, which is equivalent to the human eyes, nose, etc., feeding the external things back to the brain. That is to say, take a person or an animal for example, PLC is the brain, the combination of PLC and the machine is equivalent to the combination of the human brain and the body, but the program in the human brain is much more complex than the PLC, but the sensitivity and accuracy of the human brain is not as good as the PLC.

PLC switching output is:

Relay output: output AC and DC can be, wide voltage range, large current, low operating frequency, generally about 1Hz.

Transistor output: can only output DC, generally 30V below, small current, high operating frequency, up to 200KHz or higher.

Thyristor output: can only output AC, generally 60-450V, large current, high frequency of action, expensive.