What is PLC?
Programmable Logic Controller (PLC) is a special computer device used in industrial control systems.it is used robust construction exception functional features like sequential control, counter and timers are easy to programming. first PLC, modal 084 was invented in 1969 by dick Morley. A PLC is a modular device which can one program using a ladder diagram or statement list. it is optimized to handle
PLC Definition?
PLC stands for programmable logic controller (PLC) is a digital computer used for automation of electromechanical process in industries plc is a microprocessor-based device
How Does PLC work?
PLC is a digital computer used for industrial processes. plc designed for multiple inputs and output arrangements. plc is a device that was inverted to replace the relay circuit for machine and other output devices. this is programmed by the software
parts of plc -
- center processing unit (CPU)
- programming of PLC
- power supply
- input/output module
- center processing unit (CPU) -
CPU is the brain of the plc. CPU is usually one of the microcontroller components. CPU is communication with input and output signals. CPU also takes care of communication interconnectedness among other parts of plc controller program execution, memory operation overseeing input and setting up of output.
- programming of PLC -
PLC can be reprogrammed through a computer and manually. PLC programmed through software.
- power supply-
PLC power supply converts 220 volt AC to 24 DC supply. PLC is work on DC supply.
- Input/Output module -
input modules communicate between the field device and CPU. these are all discrete device which provides ON or OFF signal to the PLC. input have 8,16,32 input terminals it is connected with input devices like-
- NO/NC switches
- push button
- limit switches
- proximity sensor
- selector switches
- level switch
output modules are connected with various output devices. device like-
- relay
- convertor
- valves
- hooters
- indicator
- alarms ,etc.
Advantages of plc
- Easy to reprogramming
- large quantities of contents
- maintenance cost are low
- flexibility
- visual observation
What is a PLC used for?
- traffic light control
- plc based car parking system
- washing machine
- large industry
- controlling in water tank
- alarm
- conveyors
- metal costing
- CNC machines
- grinding machines
- robots product lines
- spraying
What are the types of PLC?
- Modular PLC
- Compact PLC
PLC programming languages -
- Ladder Diagram (LD)
- Sequential function chart (SFC)
- function block diagram (FBD)
- structured text (ST)
- instruction list (IL)
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