Description
Overview
Essential details:MPD110A Input-output module HITACHI
1.5 PLC digital output type
plc switching output types are roughly divided into three, relay output, transistor output and thyristor output. R-relay; t-transistor
Relay output AC DC can be, the transistor is common 5vdc and 24vdc output, thyristor is rare, only special output models.
Considering the type of output module selected, usually the relay output module has the advantages of low price, wide voltage range (can be connected to mains), large load capacity, small on-off voltage drop, strong ability to withstand instantaneous voltage and overcurrent, but short life, long response time, slow action speed, etc.
Transistor output (can be divided into PNP, NPN type) advantage is fast on-off speed (pulse output, suitable for high frequency), generally about 0.2ms; Long life; Disadvantages are low working power (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 expensive, overload capacity is poor.
There are two types of analog quantity and four kinds of analog quantity. The two types are voltage type and current type respectively. Voltage type has 0-10V and -10 to 10V. Current type mainly has 4-20MA,0-20MA. Then the module through A/D conversion, the analog quantity converted to +32767~-32768 number, and then the implementation of control.
The function of signal template is to convert various process i/o signals. The input of a variety of signals into digital quantities, easy to plc identification, processing and analysis. The output is converted into analog to various regulating mechanisms to execute, or the output is converted into 2-bit do quantity to control some devices such as start stop, on and off
1.3 Digital input/output module
The switching input module is the processing module of the external control signal or the field detection signal to the PLC CPU. The external signal is generally the button, proximity switch, travel switch and so on.
The output module is the PLC according to the input module into the signal and internal logic programming logic processing, processing results, switching output will be output by the output module high and low level signal, drive the external intermediate relay, contactor, indicator light, solenoid valve and other components, so that the external equipment for the corresponding action
1.4 Functions of the Output module
The function of PLC output module is to amplify the power of the output signal. PLC signal is expressed in level, in order to make it in the process of being read without distortion, it needs to have a certain reserve energy or to have a certain signal power. The function of the output module is actually a power amplifier. The output module is what drives the external load.
Common PLC output device, transistor, thyristor, relay.
PLC input module is used to receive the various parameters of the production process. (start stop)
PLC output module is used to send out the information obtained after the operation of the programmable controller, and through the implementation of the machine to complete all kinds of industrial site control. (The execution results with output) 1. Have good anti-interference ability.
2. It can meet the matching requirements of various signals in industrial sites.
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