Message Frame Structure - Siemens SIMATIC S7-300 Product Information

Safety Integrated Functions in
SINAMICS Drive Systems
6.3 Support of SINAMICS Safety Integrated functions by the T(F)-CPU
6.3.3

Message frame structure

Safety data block
The SIMATIC S7 Technology support for SINAMICS Safety Integrated extended functions
requires an extension of the actual value message frame with the safety data block
(3 words). The message frame extension of the input data of the axis message frame is set
in S7T Config using the dialog, SINAMICS Device > Communication >
Message frame configuration.
Structure of the drive message frame
The following figure shows the structure of the drive message frame with safety data block.
Note
The PROFIdrive actual value message frame including the safety data block
is received by the integrated technology of the T(F)-CPU. The safety data block is used
exclusively by the Axis technology object and the user program to obtain information on the
status of the Safety Integrated functions of the drive. The safety data block enables the
Axis technology object and the user program to respond to the
SINAMICS Safety Integrated functions.
NOTICE
The safety data block is not a fail-safe mechanism.
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Connection of the SINAMICS S120 to the Technology CPU
Product Information, 09/2011, A5E00480378-04