Communication: a news genre that uses telecommunications equipment to transmit messages or audio, sometimes referring to going back and forth and reporting typical people, events, news, etc. In detail.
Man-machine interface: the medium and dialogue interface for transmitting and exchanging information between people and computers. Man-machine interface exists in all fields involving man-machine information exchange. Now it is widely used in industry and commerce, which refers to the operation of machines or equipment by people and the notices issued by machines or equipment, such as faults, warnings, operating instructions, tips and so on.
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Output type of PLC:
The digital output types of PLC controller are divided into relay output, transistor output and thyristor output.
1, relay output
Different AC and DC loads can be connected between different common points, and the voltage can also be different. The load current can reach 2A/ point, and its life decreases with the increase of load current, generally ranging from hundreds of thousands to millions of times, and the response time is10 ms.
2. Transistor output
It is suitable for high-frequency operation, with short response time, generally about 0.2ms, but it can only carry DC 5-30 V load, and the maximum output load current is 0.5A/ point, but it should not be greater than 0.8A every 4 points.
3. Thyristor output
Thyristor (silicon controlled rectifier) has a load capacity of 0.2A/ point, can only carry AC load, can adapt to high-frequency action, and its response time is1ms..
Baidu Encyclopedia: PLC System