Siemens SIMATIC S7 F

Fail-Safe Blocks
Fail-Safe Systems
A5E00085588-03
8-89
8.7.4 F_NOT
Function
The block inverts the input.
Truth Table
IN OUT
01
10
I/Os
Name Data Type Explanation Default
Input:
IN F_BOOL Input 0
Output:
OUT F_BOOL Output 1
Error Handling
None
8.7.5 F_2OUT3
Function
This block monitors three binary inputs for signal state 1. The output OUT is 1 if at
least two inputs are 1. Otherwise, the output is 0. The output OUTN corresponds to
the negating output OUT.
Truth Table
IN1 IN2 IN3 OUT OUTN
00001
00101
01001
01110
10001
10110
11010
11110