The difference between the PLC and relay control

In PLC programming language, the ladder diagram is the most widely used language, through the PLC ladder diagram into instruction system program, PLC controller can accept by the programmer to type PLC user storage area. And relay control schematic diagram and ladder diagram were too similar, the main reason is that the invention of the PLC ladder diagram is roughly along the users relay control circuit element symbols, only some different individual. The primary difference between PLC and relay control has the following points: ( 1) Of different relay control circuit device is composed of many real hardware relay. And PLC is made up of many 'soft relay', the 'relay' is, in fact, the memory of the trigger, can buy '0' or '1'. ( 2) Contact the number of different hard relay contact points is limited, usually only 4 to 8 right; And 'soft' relay contact points are available for programming to infinite, because the trigger state may take any number of times. ( 3) Different methods to control relay control is implemented through hard wiring between components, & # 127; So its control functions are fixed in the line, so focused functions, not flexible; And PLC control is through the software programming to solve, as long as the program change, function can follow change, control is flexible. And because of PLC is scanning through cycle, there is no interlock and interlock circuit of relay control circuit, greatly simplifies the control design. ( 4) Work in different ways in the relay control circuit, when power on, the circuit of each relay are limited by state, the us, the broken broken. In the PLC ladder diagram, each 'soft relay' in periodic cycle scan through to, from the objective, each 'soft relay' under constraint conditions, turn on time is short. That is relay in the control way of working is parallel, and the PLC works by serial.
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