introduction to PLC

PLC stands for Programmable Logic Controller.

   What is PLC?

1. PLC is just like a control system which takes in the input and produces outputs as per the programs written by the user.
2. most common way in which programs are written in plc is via Ladder diagrams.
3. the most common manufacturers of PLC include Rockwell automation,siemens etc
4. The basic elements of a PLC include input modules or points, a Central Processing Unit (CPU), output modules or points, and a programming device
5. the output or input of plc can be analog or digital.
6. Output modules convert control signals from the CPU into digital or analog values that can be used to control various output devices.
7.  PLC’s input circuit converts the signals provided by various switches and sensors into logic signals that can be understood by the CPU.
8. The PLC's can be divided into five groups:

•  micro PLCs
•  small PLCs
•  medium PLCs
•  large PLCs
•  very large PLCs

ELECTRICAL ABBREVIATIONS PART-1

FULL FORM OF SOME BASIC ELECTRICAL TERMS 2

SL.NO	ABBREVIATION	FULL FORM
1	XLPE	CROSS LINKED POLY ETHYLENE
2	ACSR	ALUMINIUM CABLE STEEL REINFORCED
3	PTFE	POLY TETRA FLORO ETHYLENE
4	FRLS	FIRE RESISTANCE LOW SMOKE
5	EPR	ETHYLENE PROPELENE RUBBER
6	GFCI	GROUND FAULT CIRCUIT INTERRUPTER
7	HPMV LAMP	HIGH PRESSURE MERCURY VAPOUR LAMP
8	HPSV LAMP	HIGH PRESSURE SODIUM VAPOUR LAMP
9	SCIM	SQUIRREL CAGE INDUCTION MOTOR

10	SRIM	SLIP RING INDUCTION MOTOR
11	VVVF	VARIABLE VOLTAGE VARIABLE FREQUENCY
12	OLTC	On Load Tap Changer
13	FCMA	Flux Compensated Magnetic Amplifier
14	ACVS	Air Conditioning and Ventilation System
15	FDA	Fire Detection and Alarm
16	NO	Normally Opened
17	NC	Normally Closed
18	RTD	Resistance Temperature DeTECTOR

19	IEC	International Electrotechnical Commission
20	EN	European Norms
21	CENELEC	European Committee for Electrotechnical Standardization
22	VDE	Verband Deutscher Elektrotechniker
23	BS	British Standards
24	ISA	International Standards Association
25	ANSI	American National Standards Institute
26	ISO	International Standards Organization
27	IEEE	Institute of Electrical and Electronics Engineers

28	ISA	International Standards Association
29	ISO	International Organization for Standardization
30	NEMA	National Electrical Manufacturers Association
31	BIS	Bureau of Indian Standards
32	IP	INGRESS PROTECTION
33	ISMC	International Society of Motor Control
34	PCS	PULL CHORD SWITCH
35	BSS	BELT SWAY SWITCH
36	ZSS	ZERO SPEED SWITCH

FULL FORM OF BASIC ELECTRICAL TERMS 1

SL.NO	ABBREVIATION	FULL FORM
1	PLC	PROGRAMMABLE LOGIC CONTROLLER
2	DCS	DISTRIBUTED CONTROL SYSTEM
3	HMI	HUMAN MACHINE INTERFACE
4	MMI	MAN MACHINE INTERFACE
5	RIO	REMOTE INPUT OUTPUT
6	RTU	REMOTE TERMINAL UNIT
7	PID	PROPORTIONAL INTEGRAL and DERRIVATIVE
8	SCADA	SUPERVISORY CONTROL AND DATA ACQUISITION
9	HART	HIGHWAY ADRESSABLE REMOTE TRANSDUCER

10	ACDB	Alternating Current Distribution Board
11	DCDB	Direct Current Distribution Board
12	PDB	Power Distribution Board
13	PCC	Power Control Centre
14	MCC	Motor Control Centre
15	MPDB	Main Power Distribution Board
16	ACB	Air Circuit Breaker
17	VCB	Vacuum Circuit Breaker
18	MLDB	Main Lighting Distribution Board

19	DOL	DIRECT ONLINE
20	LDB	LIGHTING DISTRIBUTION BOARD
21	SLDB	SECONDARY LIGHTING DISTRIBUTION BOARD
22	EMLDB	EMERGENCY LIGHTING DISTRIBUTION BOARD
23	RCCB	RESIDUAL CURRENT CIRCUIT BREAKER
24	MPCB	MOTOR PROTECTION CIRCUIT BREAKER
25	MCB	MINIATURE CIRCUIT BREAKER
26	MCCB	MOULDED CASE CIRCUIT BREAKER
27	EOCR	ELECTRONIC OVERCURRENT RELAY

28	RCBO	Residual Current Circuit Breaker with Over-current Protection
29	ELCB	Earth Leakage Circuit Breaker
30	HRC fuse	High Rupture Capacity fuse
31	UPS	Un-interrupted Power Supply
32	JB	Junction Box
33	TB	Terminal Box
34	LCS	Local Control Station
35	CT	Current Transformer
36	PT	Potential Transformer