Slave-To-Slave Communication - Siemens Sinamics G120P Operating Instructions Manual

Write request: Assign digital input 2 with the function ON/OFF1 (p0840[1] = 722.2)
In order to link digital input 2 with ON/OFF1, you must assign parameter p0840[1] (source,
ON/OFF1) the value 722.2 (DI 2). To do this, you must fill the telegram of the parameter
channel as follows:
● PKE, bit 12 ... 15 (AK): = 7 hex (change, parameter value (field, word))
● PKE, bit 0 ... 10 (PNU): = 348 hex (840 = 348 hex, no offset, as 840 < 1999)
● IND, bit 8 ... 15 (subindex): = 1 hex (CDS1 = index1)
● IND, bit 0 ... 7 (page index): = 0 hex (offset 0 ≙ 0 hex)
● PWE1, bit 0 ... 15: = 2D2 hex (722 = 2D2 hex)
● PWE2, bit 10 ... 15: = 3f hex (drive object - for SINAMICS G120, always 63 = 3f hex)
● PWE2, bit 0 ... 9: = 2 hex (index or bit number of the parameter (DI 2 = 2))
Figure 6-11 Telegram to assign DI 2 with ON/OFF1
Other application examples
See also: Reading and writing parameters via PROFIBUS
(http://support.automation.siemens.com/WW/view/en/8894584).
6.5.1.5

Slave-to-slave communication

"Direct data exchange" is sometimes called "slave-to-slave communication" or "data
exchange broadcast". Here, slaves exchange data without any direct involvement of the
master.
Example: An inverter uses the actual speed value of another inverter as its speed setpoint.
Definitions
● Publisher: Slave, which sends data for direct communication.
● Subscriber: Slave, which receives the data for direct communication from the publisher.
● Links and access points define the data that is used for direct communication.
Restrictions
● Direct communication in the current firmware version is only possible for inverters with
PROFIBUS communication.
● A maximum of 12 PZDs are permissible for each drive.
● A maximum of 4 links to a publisher are possible.
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
6.5 PROFIdrive profile for PROFIBUS and PROFINET
Operation
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