Siemens SINAMICS S120 Function Manual page 624

Basic information about the drive system
12.11 Autonomous operating mode for DRIVE-CLiQ components
In order to maintain the protective function, the time-slice system must remain active.
The logged-on time-slice system remains active until the protective functions signal that a
safe state has been reached and the time slices can therefore be deactivated. When
communication is resumed and the DRIVE-CLiQ master signals that no bus timing changes
will be made as compared to the old parameter settings, the DRIVE-CLiQ components can
be synchronized, the time-slice system remains active as before.
Note
All algorithms for autonomous time-slice operation are executed as a background process
for the component. They thus have no influence on the computer resources utilized cyclically
by the component.
A prerequisite for resumption of communication is that the topology can be scanned in
emergency operation.
Note
When the component is running in emergency mode, it cannot be deactivated.
Preparation for autonomous time-slice operation
The application signals (basic system DRIVE-CLiQ slave components) preparation for
autonomous time-slice operation. This occurs, for example, when the "armature short circuit"
protective function is active or in chopper operation.
Switchover from normal to autonomous operation
The application activates autonomous time-slice operation. Switchover takes place
instantaneously.
Switchover from autonomous to normal operation
As of firmware version V2.6, a component can be switched to normal operation without
POWER ON at any time.
Resumption of DRIVE-CLiQ communication when autonomous mode is active
A distinction must be made between the two operating states below:
● The DRIVE-CLiQ bus timing, e.g. clock cycle settings, has not changed since the
● The DRIVE-CLiQ timing has changed:
The component may already be running when the second download takes place. To permit a
second download (reconfiguration, factory setting,...), the DRIVE-CLiQ master must
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component last booted:
The DRIVE-CLiQ component boots in cyclic mode.
Autonomous operation must continue at all costs. The DRIVE-CLiQ component refuses
to boot until the application signals that autonomous operation is no longer required. The
component can then restart with the modified clock cycle settings.
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions