Fail-Safe Function F_Min_Max; Introduction; Connections; Inputs - Siemens Simatic Manual

Fail-safe function blocks for storage and retrieval machines

3.10 Fail-safe function F_MIN_MAX

3.10.1

Introduction

A minimum/maximum value evaluation from up to 8 INTEGER values is implemented using the
F_MIN_MAX fail-safe function. In the context of the additional fail-safe function blocks from the
RBG_Failsafe_DS_V5_4 library, this block can be used, for example to select the most restrictive SLS
limit that is currently active.
3.10.2

Connections

3.10.2.1 Inputs

Name Data type
IN1 Int
IN2 Int
IN3 Int
IN4 Int
IN5 Int
IN6 Int
IN7 Int
IN8 Int
MODE Bool

3.10.2.2 Outputs

Name
Q
3.10.3

Principle of operation

3.10.3.1 Parameterization

1. The block is implemented as function. This means that when called, all inputs must be inter-
connected. If a minimum/maximum evaluation is to be performed using less than 8 signals,
then the signal sources should be interconnected a multiple number of times so that all of the
inputs are assigned at the block.
S7-Distributed Safety/SIMATIC Safety - fail-safe function blocks for storage and retrieval machines
Description
Operand 1 for evaluation
Operand 2 for evaluation
Operand 3 for evaluation
Operand 4 for evaluation
Operand 5 for evaluation
Operand 6 for evaluation
Operand 7 for evaluation
Operand 8 for evaluation
Selects minimum/maximum evaluation
0: minimum evaluation
1: maximum evaluation
Data type Description
Depending on the mode MODE, minimum or maximum value
Int
of the 8 inputs
- 3-61 -