Configuring Redundant F-I/Os; Configuring The Networks And Connections - Siemens SIMATIC S7 F Manual

Configuration
4.5

Configuring Redundant F-I/Os

(only in supported modules)
Note
In the case of redundantly configured modules, you must make sure of the
following:
•
That the two modules are of the same type and have the same parameter
assignment.
•
That the same monitoring time is parameterized for both modules.
•
That the "Safety Mode" option is selected on the "Inputs" tab.
For example, to configure two ET 200M fail-safe input modules redundantly,
proceed as follows:
1. In HWCONFIG, insert the two F-SMs in the ET 200M(s).
2. Assign parameters to the first module: Select the "Safety Mode" option on the
"Inputs" tab and set any additional parameters.
3. Assign parameters to the second module: Select the "Safety Mode" option on
the "Inputs" tab and set the same parameters as for the first module.
4. For the second module, set the "Redundancy 2x" option on the "Redundancy"
tab.
5. In the "Find Redundant Module" dialog box, select the module you want.
6. You can set the discrepancy time for redundant digital input modules, if
required.
4.6

Configuring the Networks and Connections

The configuration of networks and connections in a fail-safe system only differs
from that in a standard S7 system in one respect:
The fail-safe function blocks are required for safety-related communication
between CPUs. It is therefore only possible between the Safety Programs on F-
CPUs.
4-6
Fail-Safe Systems
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