Transfer Telegrams - Siemens SINUMERIK 804D sl Commissioning Manual

15.2

Transfer telegrams

Introduction
The transfer telegrams from NCK to the drive are transferred via an internal PROFIBUS on
the NCU. They are:
• Send telegrams (drive->NCK)
• Receive telegrams (drive->NCK)
Telegrams
The telegrams are standard telegrams with pre-defined assignment of the process data.
These telelgrams are interconnected in the drive object using BICO technology.
The drive objects that can exchange process data include the following:
1. Active line module (A_INF)
2. Basic line module (B_INF)
3. Motor module (SERVO)
4. Control unit (CU)
The order of the drive objects in the telegram is displayed on the drive page via the
parameter list in the operating area Commissioning > Machine data > Control Unit MD in
p978[0...15] and may also be changed through it.
Literature
SINAMICS S120 Commissioning Manual
Receive words/send words
By selecting a telegram via p922 of the related drive object (operating area
"Commissioning" > "Machine data" > "Drive MD"), the process data is determined which is
transferred between the master and slave.
From the perspective of the slave, the received process data comprises the receive words
and the process data to be sent the send words.
The receive and send words are comprised of the following elements:
• Receive words: Control words or setpoints
• Send words: Status words or actual values
Message frame types
The message frame length for communication with the drive must be defined in the hardware
configuration. The message frame length to be chosen depends on the axis functions
required, e.g., the number of encoders or DSC, or the functions in the drive used.
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0
Fundamentals
15.2 Transfer telegrams
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