Structured Text; Function Block - Allen-Bradley Logix5000 Reference Manual

Chapter 7 Move/Logical Instructions (MOV, MVM, BTD, MVMT, BTDT, CLR, SWPB, AND, OR, XOR, NOT, BAND, BOR, BXOR, BNOT)
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Example 1:
This example ORs bool_in1 and bool_in2 and places the result in value_result_or.
If BOOL_IN1 is
0
0
1
1

Structured Text

value_result_or := bool_in1 OR bool_in2;

Function Block

Example 2:
In this example, light1 is set (on) if the following occurs:
· Only bool_in1 is set (true)
· Only bool_in2 is set (true)
· Both bool_in1 and bool_in2 are set (true)
Otherwise, light1 is cleared (off ).
Structured Text
IF bool_in1 OR bool_in2 THEN
light1 := 1;
ELSE
light1 := 0;
END_IF;
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
If BOOL_IN2 is Then VALUE_RESULT_OR is
0 0
1 1
0 1
1 1