Siemens SINAMICS S120 Function Manual page 758

Communication
11.4 Communication via SINAMICS Link
Send and receive data
The SINAMICS Link telegram contains 16 slots (0...15) for the process data (PZD1...16).
Each PZD is precisely 1 word long (= 16 bits). Slots that are not required are automatically
filled with zeros.
Slot 0 1
PZD 1 2
SINAMICS Link telegram contents
Each transfer cycle, every SINAMICS Link node can send 1 telegram with 16 PZDs. Each
node receives all of the telegrams that are sent. For each transfer cycle, a node can select
and process up to 16 PZDs 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
PZDs.
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 PZDs that can be received and sent also depends on the drive
object. The number of PZDs that can be evaluated corresponds to communication
according to PROFIdrive; however, for SINAMICS Link, it is limited to a maximum of 16
PZDs.
Transmission time
With SINAMICS Link, a transmission time of up to 500 µs is possible (with a max. controller
cycle of 500 µs; synchronous bus cycle of 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 switching over parameters p8811 and p8812, carry out a POWER ON to accept the
settings.
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Drive functions