PLC Important Instructions PDF

Harikesh Yadav

PLC Important Instructions PDF

Relay-type (Basic) instructions- I, O, OSR, SET, RES, T, C

Data Handling Instructions

1.Data move Instructions- MOV, COP, FLL, TOD, FRD, DEG, RAD (degrees to radian).

2.Comparison instructions-EQU (equal), NEQ (not equal), GEQ (greater than or equal), GRT (greater than).

Program flow control instructions- MCR (master control reset), JMP, LBL, JSR, SBR, RET, SUS, REF

Specific instructions- BSL, BSR (bit shift justify/right), SQO (sequencer output), SQC (sequencer compare), SQL (sequencer load).

High speed counter instructions- HSC, HSL, RES, HSE

Communication instructions- MSQ, SVC

ASCII instructions- ABL, ACB, ACI, ACL, CAN

Latch Instructions (Set and Reset)

The latch instruction is often called a SET or OTL (output latch).

The unlatch instruction is often called a RES (reset), OTU (output unlatch) or RST (reset).

Data comparison Instructions

less than (< or LESS),

equal to (= or EQU),

less than or equal to (<= or LEQ),

greater than (> or GRT),

greater than or equal to (>= or GEQ)

not equal to ( NEQ)

Arithmetic (mathematical) Instructions

Addition (ADD) – The capability to add one piece of data to another.

Subtraction (SUB) – The capability to subtract one piece of data from another.

Multiplication (MUL) – The capability to multiply one piece of data by another.

Division (DIV) – The capability to divide one piece of data from another.

Continuous control (PID Instructions)

Master Control instruction (MC/MCR)

Jump to label instruction (JMP)

Label instruction (LBL)

Jump to Subroutine instruction (JSR)

Subroutine instruction (SBR)

Return from Subroutine instruction (RET)

Master Control/ Master Control Reset (MC/MCR) Instructions

MC/MCR (master control/master control reset)

MCS/MCR (master control set/master control reset)

MCR (master control reset)

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