Below are the standard operators for managing booleans:

Operator

Description

AND
OR
XOR
NOT
S
R

QOR

performs a boolean AND
performs a boolean OR
performs an exclusive OR
performs a boolean negation of its input
force a boolean output to TRUE
force a boolean output to FALSE
Qualified OR

Below are the available blocks for managing boolean signals:

Block

Description

RS
SR
R_TRIG
F_TRIG
SEMA
FLIPFLOP

reset dominant bistable
set dominant bistable
rising pulse detection
falling pulse detection
semaphore
flipflop^bistable

Other topics in this chapter

AND &

FLIPFLOP

F_TRIG

NOT

OR

R

RS

R_TRIG

S

SEMA

SR

XOR

QOR

Boolean Operations

IEC 61131-3 Automation platform > Programming - Reference guide > Boolean Operations

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