PLC/Basics/02

PLC Components :-
            1) Power Supply Module

            2) CPU or Processor

            3) Communication Modules

            4) Data Modules (Input & Output Modules)   

Fig. PLC Components

The details of each module are -

1) Power Supply Modules

Fig. Allen-Bradley Power Supply Module with Chasis

        Power supply module supplies power (DC) to the all other modules (CPU/Processor,Communication Modules,Data Modules,etc.). Every Logix Platform has it's type of Power Supply Module.

e.g. AB ControlLogix has power supply module AB PA72,AB FlexLogix has AB Flex Power Supply Module,etc.

       PSU supplies power to all other modules through Chasis (Generally at 1.3V/3.3V/5V/24V DC).While input voltage to PSU is 110V/220V ac or 24V/48V DC. PSU rating is in amperes.

More information about Allen-Bradley Power Supply module available at

http://www.ab.com/en/epub/catalogs/12762/2181376/2416247/360807/1837526/print.html 

2) CPU or Processor

  

        CPU (Central Processing Unit) is the brain of PLC system. It runs all programs/processes/calculations /interlocks etc.