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Entry type: Product note Entry ID: 109751498, Entry date: 11/02/2017

SINUMERIK Safety Integrated and SINUMERIK Safety Integrated plus with gantry axes and in a master/slave group

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When using SINUMERIK Safety Integrated and SINUMERIK Safety Integrated plus with gantry axes and in a master/slave group, you must observe the following:

In a gantry group, SINUMERIK Safety Integrated or SINUMERIK Safety Integrated plus must be released both in the master and in the slave axis.

In a gantry group, you cannot rely on the fact that, for example, a stop reaction to the master axis is not automatically forwarded to the slave axis.
Since the gantry coupling could be released, an axis would thus not be monitored, provided that SINUMERIK Safety Integrated / Safety Integrated plus would be configured in one axis only.

Even with a master/slave group, SINUMERIK Safety Integrated / Safety Integrated plus must be configured on both axes if no fixed mechanical coupling has been installed.
If a fixed mechanical coupling has been installed, SINUMERIK Safety Integrated / Safety Integrated plus need only be configured in the master axis.
On the basis of a risk assessment, the machine manufacturer must assess whether the fixed mechanical coupling is suffiently stable, such that the exclusive configuring of SINUMERIK Safety Integrated / Safety Integrated plus in the master axis suffices.

General condition when using a brake test (SINUMERIK/SINAMICS) in axis groups:
In a gantry or master/slave group, the machine manufacturer has to decide in individual cases whether mechanical damage can occur in case of a defective brake. If mechanical damage can occur, the brake test should not be performed.

Special solution SERVCOUP for SINUMERIK 840D sl:
In the SERVO control mode, SERVCOUP allows motors to be operated which, as a result of
their size and/or type of construction, cannot be operated from an individual SINAMICS power unit
. These motors are split up into several drive objects, each of which can be operated on
a Motor Module, and can be coupled with one another. As a consequence, the individual
drive objects can be seen as partial motors with their own winding and terminals

The application of the SERVO coupling requires that identical motors are connected mechanically
in a highly rigid manner

OA applications (generally) have no influence on the safety (ncSI/dbSI).
With the SERVCOUP solution, the safety functions (extended / ncSI) are used to monitor the drive with the master axis.
The slave axes are only provided with basic safety.
If an error occurs on the master axei, the slave axes are stopped via STO; this must be solved through the application (see Function Manual SERVCOUP:Function Manual SERVCOUP Section 4.14).

If, for example, the monitoring speed of the Safely-Limited Speed (SLS) is violated at the master
drive object, the parameterized safety stop reaction is triggered at the master
drive object. As a result, the complete drive group is stopped.

Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit
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