F_Or4 - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
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
0 0
0 0
0 0
0 0
0 1
0 1
0 1
0 1
1 0
1 0
1 0
1 0
1 1
1 1
1 1
1 1
I/Os
Inputs:
Output:
Error Handling
None
Fail-Safe Systems
A5E00085588-03
IN3 IN4 OUT
0 0 0
0 1 1
1 0 1
1 1 1
0 0 1
0 1 1
1 0 1
1 1 1
0 0 1
0 1 1
1 0 1
1 1 1
0 0 1
0 1 1
1 0 1
1 1 1
Name Data Type
IN1 F_BOOL
IN2 F_BOOL
IN3 F_BOOL
IN4 F_BOOL
OUT F_BOOL
OUTN F_BOOL
OUTN
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Explanation Default
Input 1 0
Input 2 0
Input 3 0
Input 4 0
Output 0
Negating output 1
8-87