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

6.1

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

General description
The safety-oriented 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 (Fail-safe 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 (Fail-safe Digital Output, safety-oriented digital output = safe output terminal pair)
delivers a dual-channel signal representing feedback from the safety functions. It is suitable,
for example, for the safety-oriented control of actuators (e.g. line contactor). See also the
figures "F-DI 0 ... 4 overview", "F-DI 5 ... 9 overview" and "F-DO overview (without showing
the main contacts on the contactors)".
Dual-channel processing of I/O signals
A dual-channel structure is implemented for data input/output and for processing safety-
oriented I/O signals. All requests and feedback signals for safety-oriented functions should
be entered or tapped using both channels.
The following options are available for controlling Safety Integrated functions
● Control via terminals on the Control Unit and Motor Module (only STO, SS1 (time
● Control by means of TM54F terminals
● Control via PROFIsafe
Only one of the two control modes can be selected for each drive object, that is, either
TM54F or PROFIsafe. Control by means of terminals on the Control Unit and Motor Module
can be activated alongside with one of the other two options.
NOTICE
Per single Control Unit, either control via PROFIsafe or TM54F is permitted. Mixed
operation is not permitted.
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
controlled) and SBC).
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