Siemens SIMATIC S7 FH User Manual

Fail-Safe Blocks
Fail-Safe Systems
A5E00085588-03
8-87
8.7.2 F_OR4
Function
This block links the inputs by means of OR. The output OUT is 1 if at least one
input is 1. If all outputs are 0, the output is 0. The output OUTN corresponds to the
negating output OUT.
Truth Table
IN1 IN2 IN3 IN4 OUT OUTN
000001
000110
001010
001110
010010
010110
011010
011110
100010
100110
101010
101110
110010
110110
111010
111110
I/Os
Name Data Type Explanation Default
Inputs:
IN1 F_BOOL Input 1 0
IN2 F_BOOL Input 2 0
IN3 F_BOOL Input 3 0
IN4 F_BOOL Input 4 0
Output:
OUT F_BOOL Output 0
OUTN F_BOOL Negating output 1
Error Handling
None

Siemens SIMATIC S7 FH Specifications

General

Brand	Siemens
Model	SIMATIC S7 FH
Category	Controller
Language	English