Input/output module of PLC and its role in the control

The input/output module is programmable controller PLC connected with industrial production equipment or industrial production processes. The scene of the input signal, such as the push button switch, trip switch, limit switch and sensor output switch quantity or analog ( Pressure, flow, temperature, voltage, current) And so on, through the input module to the PLC. Because the signal level of all kinds, and the information processing by the programmable controller CPU can only is a standard level, so the input module also need to convert these signals into the PLC can accept and digital signal processing. Input module is used for receiving the central processing of digital signal processor, and put it into the scene components can receive control signal, to drive such as solenoid valve, lighting show, motor actuators. Programmable controller has a variety of input/output module type digital quantity input/output module and analog input/output module. These modules dc and ac, type, voltage and current parameters of each type is different levels mainly include digital quantity input/output module and analog input/output module, part have terminal row, in order to filter out noise signals and facilitate PLC internal to the signal processing, these modules have a filter on the latch circuit, level conversion, signal. Digital quantity input module with coupled circuit of radio, film and television, its purpose is to put the PLC and the external circuit isolation, to improve the anti-interference ability of PLC. Number two output relay output, the output transistor and thyristor output three ways. Analog input/output module is mainly used to realize conversion between analog and digital quantity, namely A/D or D/A conversion. Due to the sensor or actuator industrial control system is continuous variation of some signal, so the analog quantity must be through the analog input/output module connected to the PLC CPU. After the analog input module, A/D conversion of binary digital quantity, the photoelectric coupler and the output latch bearing PLC controller to hook up 1/0 of the bus. Now standard range of analog voltage is 0 - 5 v and 0 - 10 volts. Plus: 0 - somV、0— IV、— 5 - +SV、— 10 - +10V，0— 10 ma, etc. Analog input module receives the standard range of analog voltage or current monkey, converts it into fails 8, 10 or 12 bit binary digital signal, sent to the CPU for processing. Analog output module converts binary digital signal of the CPU into standard range of output voltage or current signal, provided to the actuator.
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