PLC Important Instructions PDF
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
PLC Important Instructions PDF
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)
PLC Important Instructions PDF
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