Siemens SINAMICS DCM Manual page 487

Descriptions of functions
10.6 Communication via SINAMICS Link
Each transfer cycle, every SINAMICS Link node can send one telegram with 16 PZD. Each
node receives all of the telegrams that are sent. For each transfer cycle, a node can select
and process up to 16 PZD from all telegrams that have been received. Single words and
double words can be sent and received. You must write double words in two consecutive
PZD.
Limitations:
● In a telegram, a PZD may only be sent and received once. If a PZD occurs more than
once in a telegram, then Alarm A50002 or A50003 is output.
● It is not possible to read in your own send data. Alarm A50006 is then output.
● The maximum number of PZD that can be received and sent also depends on the drive
object. The number of PZD that can be evaluated corresponds to communication
according to PROFIdrive; however, for SINAMICS Link, it is limited to a maximum of 16
PZD.
Transmission time
With SINAMICS Link, a transmission time of 1000 µs is possible (with a max. controller cycle
of 500 µs; synchronous bus cycle, 500 µs).
Bus cycle and number of nodes
You can operate the bus cycle of the SINAMICS Link with the current controller cycle, either
synchronized or non-synchronized.
Synchronized operation is set with p8812[0] = 1. A maximum of 16 nodes can then
communicate with one another via SINAMICS Link. To do so, set the maximum number of
nodes with p8811 = 16.
In the non-synchronized mode, the bus cycle of the SINAMICS Link can be set with p8812[1]
to between 1000 µs and 2000 µs. Then, via p8811, a maximum of 64 SINAMICS Link nodes
can communicate with one other.
After changing over parameters p8811 and p8812, carry out a POWER ON to accept the
settings.
488
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
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SINAMICS DCM DC Converter