The output of the programmable controller unit and the type of the output circuit

Programmable controller output signal types can be switch, analog and digital. Output unit broadly points include two parts: one is connected to is accused of equipment interface circuit, the other part is a reflection of the output register. The PLC controller runtime CPU read input from the input image register information and processing, the results in the output image registers. Output image register is composed of output that corresponds to the trigger, the output interface circuit controlled by the weak current signal is converted into the scene need high voltage signal output, to drive the solenoid valve, contactor, indicator light is accused of equipment such as actuators. Usually have three types: the output interface circuit relay output type, the transistor, the output type and output is brake pipe. Each output circuit adopts electrical isolation technology, the power supply is provided by external and output current average of 1. 5 - 2 a, output current rating is related to the nature of the load. For the PLC controller to avoid damage by the effect of instantaneous large current, output external connection protection measures must be adopted: one is the output of public termination fuse; Second, the protection circuit, a sense of communication load, general resistance capacity to absorb circuit; Renew for dc load flow diode. Great part of the PLC output terminals by grouping type and separated type. For transistor output type and the source output and leakage output in two forms. Great part of the European and American brands of PLC type USES the source output, while the great part of the Asian brands PLC controller adopts the leakage model output.
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