ET 200S Distributed I/O System - Fail-Safe Modules 
Installation and Operating Manual, 08/2008, A5E00103686-07 
19 
Configuring 
2
2.1  Configuring ET 200S with Fail-Safe Modules 
Introduction 
The ET 200S distributed I/O systems support configurations with standard and fail-safe 
modules. This chapter presents an example configuration.  
Configuration example of ET 200S with Fail-Safe Modules 
In the following figure you will find a configuration example using standard and fail-safe 
modules in an ET 200S. You 
can
 divide and install the modules in fail-safe and standard 
potential groups. A new potential group always begins with a power module. 
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①  Fail-safe and standard potential groups mixed 
②  Fail-safe potential group 
③  Standard potential group 
Figure 2-1  ET 200S Configuration Example with Fail-Safe Modules 
 
WARNING 
 
If the implemented standard module has electrical isolation of ≥ 60 VAC / 75 VDC and test 
voltage of 500 VDC, it is possible to mix F-DI-/F-DO modules and standard DI-/DO-/FM 
modules within one potential group as of the following MLFBs for the SIL3/Category 4/PLe: 
•  6ES7138-4CF03-0AB0 
•  6ES7138-4CF42-0AB0 
•  3RK1903-3BA02 
•  6ES7138-4FA04-0AB0 
•  6ES7138-4FC01-0AB0 
•  6ES7138-4FB03-0AB0 
•  6ES7 138-4FR00-0AA0 
For the predecessor modules, you can achieve SIL2/Category 3/PLd with a mix of F-DI-/F-
DO modules and standard DI-DO modules.