ABB distributed control system PM632 programmable logic controller
Brand ABB Color Standard Application Industrial height 275mm rated current 440mA
Protection Level IP45 Suitable for motor power 356KW Applicable Site Power Industry Material Code GJR2391500R1220 Power industry HIEE401782R0001 Part number PM632
Applicable pipe 2 Whether imported is weighing 4.38 kg can be sold nationwide
ABB distributed control system PM632 programmable logic controller
The main differences between PLC ladder diagram and relay control schematic diagram are as follows:
(1) Different components
The relay control circuit is composed of many real hardware relays. The PLC is composed of many “soft relays”, these “relays” are actually triggers in the memory, can be set “0” or “1”.
(2) The number of contacts is different
Hard relays have limited contacts, generally only 4 to 8 pairs; The “soft relay” can be programmed with an unlimited number of contacts, because the trigger state can be used any number of times.
(3) Different control methods
Relay control is realized by hard wiring between components, so its control function is fixed in the line, so the function is specific and not flexible; The PLC control is solved by software programming, as long as the program changes, the function can be changed, and the control is very flexible. And because PLC is working through cyclic scanning, there is no interlock and interlock circuit in the relay control line, and the control design is greatly simplified.
(4) Different ways of working
In the relay control line, when the power supply is switched on, the relays in the line are in a restricted state, and the closing is closed and the breaking is broken. In the ladder diagram of the PLC, each “soft relay” is in a periodic cycle scanning switch, from an objective point of view, each “soft relay” is subject to conditions, the switching time is short. That is to say, the working mode of the relay in the control is parallel, and the working mode of the PLC is serial.
ABB distributed control system PM632 programmable logic controller
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