Siemens SIMATIC Operating Instructions Manual page 16

Product Overview
1.2 Application of ET 200pro fail-safe modules
Application Limited to Safety Mode
You can operate standard and fail-safe modules simultaneously in an ET 200pro.
Fail-safe modules can only be used in safety mode. They cannot be operated in standard
mode.
Achievable Safety Classes
Fail-safe modules are equipped with integrated safety functions for safety mode.
The following safety classes can be achieved by assigning applicable parameters to the
safety functions in
package, combining certain standard and F-modules and arranging the wiring of the sensors
and actuators in a specific way:
Table 1-1
Safety class in safety mode
In accordance with IEC
61508
SIL2
SIL3
SIL3
See also
Configuration of ET 200pro with Fail-Safe Modules (Page 19)
16
STEP 7
with the
Achievable Safety Classes in Safety Mode
In accordance with EN 954-1
Category 3
Category 3
Category 4
S7 Distributed Safety
or
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
S7 F/FH Systems
optional
In accordance with Performance
Level (PL)
d
e
e