Part 3 block diagram of PLC.
- 1. Block Diagram of PLC & Components of PLC
- 2. Block Diagram of PLC Programming Communication Device Central Processing Unit (CPU) Memory Program Power Supply INPUT Circuit (Field Area) OUTPUT Circuit (Field Area) Optical Isolation Optical Isolation
- 3. Components of PLC CPU(Central Processing unit) INPUT Module OUTPUT Module Power Supply Programming Device
- 4. Components of PLC CUP(Central Processing unit):- • CPU module has a central processor, ROM & RAM memory. • ROM memory includes operating system, driver and application program. RAM memory is used to store programs and data. • CPU is the brain of PLC with an octal or hexagonal microprocessor. Being a microprocessor based CPU, it replaces timers, relays, and counters. • Two types of processors as a single bit or word processor can be incorporated with a PLC. • CPU reads the input data from sensors, process it and finally the command to controlling devices.
- 5. Components of PLC CPU consist of following blocks • ALU(Arithmetic Logic Unit) • Programming memory. • Process image memory. • Internal timer and counter. • Flags or status bit filter. • CPU required 5v.
- 6. Components of PLC INPUT MODULE:- • Input module act as an interface between the field control input and the CPU voltage/current generated by the sensors,transducer,limit switch,push button,etc. • Input module converts the field signal into standard control signal for processing by the PLC • The input module of PLC does four main functions. 1. Input module interface receives the signal from process devices at 220 V AC 2. Converts the input signal to 5 V DC that can be used by PLC 3. Isolator block is used to isolate/prevent PLC from undergoing fluctuation 4. After which the signal is sent to the output end i.e the PLC
- 7. Components of PLC OUTPUT Module:- Output Module acts as link between the CPU and the output devices located in the field devices could be relays,contaector,lamps,motorized actuators, solenoid valves,etc.These device actually control the process.
- 8. Power Supply:- This module is used to provide the required power to the whole PLC system. It converts the available AC power to DC power which is required by the CPU and I/O module. PLC generally works on 24V DC supply and Rack type PLC work on 230/220Vac. Few PLC uses an isolated power supply.
- 9. Components of PLC Programming Device:- A personal computer(PC) is the most commonly used programming device.The software allows users to create,edit,store and troubleshoot programs. This is show pitchure id programming cable Rs-232 and Ethernet cabl for Programming cable RS-232 Cable Ethernet Cable
- 10. Next Video Topic Types of PLC.
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