Control Of The Safety Functions; Overview Of F-Di/F-Dos And Of Their Structure - Siemens SINAMICS S120 Function Manual

Control of the safety functions

5.1

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

Description
The failsafe input and output signals (F-DI and F-DO) interface the internal Safety Integrated
functionality with the process.
F-DI signals (Failsafe Digital Inputs) control active monitoring of the activation/deactivation of
safety functions. This function also depends on the status of sensors (e.g. switches).
F-DO signals (Failsafe Digital Outputs) are feedback information of the safety functions.
They are also suitable for the failsafe control of actuators (e.g. line contactor).
Dual-channel processing of I/O signals
A dual-channel structure is available 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 monitoring channels.
The following options are available for controlling Safety Integrated functions:
● Control by way of terminals on the Control Unit and Motor Module (only STO, SS1 (time
● Control by way of TM54F terminals
● Control by way of PROFIsafe
Only one of the two control modes can be selected for each drive object, that is, either
TM54F or PROFIsafe. Control by way of terminals on the Control Unit and Motor Module can
be activated alongside with one of the other two options.
NOTICE
Each Control Unit must be controlled either by way of PROFIsafe, or by way of TM54F. A
mixed mode is not allowed.
Safety Integrated
Function Manual, (FHS) , 07/2007 Edition, 6SL3097-2AR00-0BP0
controlled) and SBC).
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