Siemens SIMATIC S7 F, Manual

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Fail-Safe Systems
A5E00085588-03
4-1
4 Configuration
4.1 Overview
This section describes the main differences between the configuration of a fail-safe
system and that of a standard S7 system. It also deals with the special features of
the programming device functions that you must watch out for when working with a
fail-safe system.
4.2 Hardware Configuration and Parameter Assignment
The basic procedure for configuring a fail-safe system doesn’t differ from that of a
standard S7 system, e.g. it comprises the following steps:
•
Creating projects and stations
•
Configuring hardware and the network
•
Downloading the system data to the PLC
The individual steps required for configuration are also largely identical with those
of the S7-400. Authorization is always required to change the parameter
assignment of an F-System.
Rules for F-Systems
In addition to the rules that generally apply to the arrangement of modules in an
S7-400, the following conditions must be complied with in the case of an F-System:
Note: An ET 200S can contain Fail-Safe Modules and Standard Modules.
•
In safety mode, fail-safe signal modules can only be used in an ET 200M with
the IM 153-2 FO or a Safety Protector Module. Exception: The S7-300
standard module SM 331; AI 2 x 12Bit (order no. 6ES7 331-7TB00-0AB0) can
be used together with fail-safe signal modules in safety mode in an ET 200M.
•
Fail-safe operation of the F-SMs is only possible in the address area 8 to 8191.
The address used must be set on the F-SM by means of switches and must
match the configured address.
•
To run a CPU with a Safety Program, the appropriate option must be activated
for the CPU and a password configured.
•
If the configuration of an F-I/O or the CPU (cycle times of the cyclic interrupt
OBs) is changed, the Safety Program must be compiled again and downloaded
to the CPU.