中文版
Description
plc switching output types are roughly divided into three types, relay output type, transistor output type and thyristor output type. R-relay; t-transistor
Relay output AC DC can be, the transistor common 5vdc and 24vdc output, thyristor is relatively rare, only special output models have.
Considering the type of output module selected, usually the relay output module has low price, wide voltage range (can be connected to the mains), large load capacity, small on-voltage drop, strong ability to withstand instantaneous voltage and overcurrent, but short life, long response time, slow action speed and so on.
Transistor output (can be divided into PNP, NPN type) has the advantage of fast on-off speed (pulse output, suitable for high frequency), generally about 0.2ms; Long life; The disadvantage is low working voltage (can not be connected to the mains); The load capacity is weak, about 300mA.
Thyristor output module is suitable for DC load, frequent switching, fast reaction speed, long life, low inductive power factor load, but the price is more expensive, the overload capacity is poor.
SAFT-190-APC
PLC has three input types. One is DC input, generally DC24V or DC12V, which is divided into source input and leakage input. The source input means that the input voltage is 0V and the COM terminal is 24V. The leakage input means that the input voltage is 24V and the COM terminal is 0V. The second is AC input, the input specification is AC220V; The third type of input is an analog input, and the specifications are 0-20MA current signal and 4-20MA current signal.
There are three types of plc output: the first is the relay output, the relay output response speed is slow, the output current is large, generally up to 2A, but the electric shock life is short, the output frequency is low, the maximum is 1HZ; The second is the transistor output, the transistor output reaction speed is fast, the output current is small, the contact life is long, the output frequency is high, can reach 10KHZ; The third is the analog output, the specifications are generally 0-20MA current signal, 4-20MA current signal, 0-5V voltage signal, 0-10V voltage signal, etc.
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