Siemens SINAMICS S120 Function Manual page 671

Two-channel monitoring structure
All the main hardware and software functions for Safety Integrated are implemented in two
independent monitoring channels (e.g. switch-off signal paths, data management, data
comparison).
The two drive monitoring channels are implemented using the following components:
● Control Unit
● Motor Module/Power Module belonging to a drive
The monitoring functions in each monitoring channel work on the principle that a defined
status must prevail before each action is carried out and a specific acknowledgment must be
made after each action.
If these expectations of a monitoring channel are not fulfilled, the drive coasts to a standstill
(two-channel) and an appropriate message is output.
Two-channel parameterization
Safety Integrated functions must be parameterized through two channel; this means that
there is one parameter each for the 1st and 2nd channels. These two parameters must be
identically parameterized.
For safety reasons, when using the STARTER commissioning tool (or SCOUT) you can only
set the safety-relevant parameters of the 1st. channel offline.
To set the safety-relevant parameters of the 2nd channel, proceed as follows:
● Activate the "Copy parameters after download" checkbox and then establish an online
connection to the drive unit. Perform the download and then adapt the checksums.
Execute the "Copy RAM to ROM" command and then a POWER ON.
● Or establish an online connection to the drive unit first and then duplicate the parameters
by clicking the "Copy parameters" button on the start screen of the configuration.
In STARTER, you can also set the safety-relevant parameters of the 2nd channel by
duplicating. This is the reason that in this manual, only the parameters of the 1st channel are
mentioned. You can find the associated parameters of the 2nd channel in the parameter
description, e.g. in the SINAMICS S120/S150 List Manual.
Also for faults and alarms, only the fault numbers of the 1st channel are mentioned.
Switch-off signal paths
Two independent switch-off signal paths are available. All switch-off signal paths are low-
active, thereby ensuring that the system is always switched to a safe state if a component
fails or in the event of an open circuit.
If a fault is discovered in the switch-off signal paths, the "Safe Torque Off" function is
activated and a system restart inhibited.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Safety Integrated Basic Functions
10.2 General information
671