Communication via PROFIBUS
Cyclic communication
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E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
4.3 Cyclic communication
Cyclic communication is the method used to exchange time-critical process data
between master and slave in the Data_Exchange telegram.
4.3.1 Telegrams and process data
General information
The selection of a telegram via p0922 determines which process data is trans-
ferred between master and slave.
From the perspective of the slave, the received process data comprises the re-
ceive words and the process data to be sent the send words.
The receive and send words consist of the following elements:
S Receive words: Control words or setpoints
S Send words: Status words or actual values
What kinds of telegram are used?
1. Standard telegrams
The standard telegrams are structured in accordance with the PROFIdrive
Profile V3.1. The internal process data links are set up automatically in
accordance with the telegram number setting.
The following standard telegrams can be set via p0922:
– 1 Speed control, 2 words
– 2 Speed control, 4 words
– 3 Speed control, 1 position encoders
– 4 Speed control, 2 position encoders
– 5 DSC, 1 position encoders
– 6 DSC, 2 position encoders
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