Controlling The Safety Functions; Overview Of F-Di/F-Dos And Of Their Structure - Siemens Sinamics S110 Function Manual

8.6

Controlling the safety functions

8.6.1

Overview of F-DI/F-DOs and of their structure

Description
The failsafe input and output terminals (F-DI and F-DO) act as an interface between the
internal Safety Integrated functionality and the process.
A dual channel signal applied to an F-DI (Failsafe Digital Input, safety-oriented digital input =
safe input terminal pair) controls the active monitoring of the activation/deactivation of safety
functions. This function also depends on the status of sensors (e.g. switches).
An F-DO (Failsafe Digital Output, safety-oriented digital output = safe output terminal pair)
delivers a dual channel signal representing feedback from the safety functions. It is also
suitable for the failsafe control of actuators (e.g. line contactor). See also diagram "Internal
connection of F-DI / F-DO of the CU305".
Dual-channel processing of I/O signals
A dual-channel structure is realized for data input/output and for processing failsafe I/O
signals. All requests and feedback signals for failsafe functions should be entered or tapped
using both channels.
The following options are available for controlling Safety Integrated functions:
● Control via safe input terminals on the Control Unit
● Control by way of PROFIsafe
The Basic Functions (STO, SBC, SS1 time controlled) can be controlled simultaneously
using a safe input terminal pair (F-DI0) and via PROFIsafe. For the Extended Functions,
control is only available either via the safe input terminal pairs or via PROFIsafe.
Drive functions
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Safety Integrated Functions
8.6 Controlling the safety functions
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