Siemens SIMATIC ET 200S Installation And Operating Manual page 63

Two fail-safe digital outputs
In addition to the P1 and P2 voltage buses the power module has two fail-safe digital
outputs, DO 0 and DO 1. AK6/SIL3/Category 4 can be achieved with these outputs if
standard DO modules are not connected to P1 and P2.
Figure 7-1
Conditions for Achieving Safety Class
The conditions for achieving the respective safety classes are summarized in the following
table.
Table 7-2
Condition
ET 200S standard modules supplied by means of P1 and P2
DO 0 and DO 1 used, modules not supplied by means of P1 and
P2
ET 200S Distributed I/O System - Fail-Safe Modules
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04
Wiring diagram of the PM-E F pm DC24V PROFIsafe
PM-E F pm DC24V PROFIsafe: Conditions for AK/SIL/Category
7.2 PM-E F pm DC24V PROFIsafe Power Module
Achievable AK/SIL/Category
AK4/SIL2/Category 3 on P1 and
P2 and at DO 0 and DO 1
AK6/SIL3/Category 4 on DO 0
and DO 1
Fail-Safe Modules
7-3