Application 2: Safety Mode Ak6/Sil3/Category 3 - Siemens SIMATIC ET 200S Installation And Operating Manual

Fail-Safe Modules
7.5 4/8 F-DI VDC24V PROFIsafe Digital Electronic Module
7.5.7

Application 2: Safety Mode AK6/SIL3/Category 3

Assigning Inputs to Each Other
The EM 4/8 F-DI DC24V PROFIsafe has 8 fail-safe inputs DI 0 to DI 7 (SIL2). A pair of these
inputs can each be used as one input (SIL3). The following assignment applies:
• DI 0 with DI 4
• DI 1 with DI 5
• DI 2 with DI 6
• DI 3 with DI 7
Sensor Supply
The EM 4/8 F-DI 24 VDC PROFIsafe provides sensor supply Vs1 for inputs 0 to 3 and
sensor supply Vs2 for inputs 4 to 7. The sensor power supply can be provided internally or
externally.
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ET 200S Distributed I/O System - Fail-Safe Modules
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04