PLC

 PLC 

Programmable Logic Controller



It is a special computer that is program to serve process in industries Like petroleum , steel, energy , petrochemicals , automations.

PLC comes as a replacement of Classic control










PLC hardware Component


S7-300 RACK







1- PS SIEMENS POWER SUPPLY  (Optional for S7-300/ S7-400 must use siemens PS)

2- CPU

3- IM Interface module

4:11 (SM , FM or CP)

S7-300 UP TO 4 RACKS (32 MODULES)

 



SM Signal Modules 

  • DI            Switches 0,1
  • DO          Relays, Contactors 0,1
  • DI/DO
  • AI            Transmitters 4:20mA mostly
  • AO           Control valve control 4:20mA mostly
  • AI/AO

 

FM Function Module



There is some devices like encoders, flow sensors, weigh sensors need special intelligent modules to deal with

  CP Communication Processor

Some CPUs has only MPI port communication
          to communicate with another PLCs-inverters-Remote I/O modules

We need Communication Processor module to provide communication protocol needed like

  • PROFI-BUS
  • PROFI-NET



  

S7-1500



•        S7-1518 “Standard”

•        S7-1511C “Compact”

•        S7-1518F “Fail safe”

•        S7-1518T “Technology TCPU”

•        S7-1515TF “Technology-Fail safe”

•        S7-1500 H “High availability”

•         S7-1500 R “Redundant”


 Digital Input Connection





Digital Output types

  • Relay
  • Transistor (Solid State)

Digital Output Connection




Analogue I/O



Analogue Addressing




Analogue Input Connection




Analogue Output Connection




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