Siemens SINAMICS G120 - Slave-To-Slave Communication

Configuring the fieldbus
7.3 PROFIdrive profile for PROFIBUS and PROFINET
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
129
Write request: Assign digital input 2 with the function ON/OFF1 (p0840[1] = 722.2)
In order to link digital input 2 with OFF1/ON, 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 of parameter (DI 2 = 2))
Figure 7-7 Telegram, to assign DI 2 with ON/OFF1
"Reading and writing parameters" application example
See: Reading and writing parameters via PROFIBUS
(http://support.automation.siemens.com/WW/view/en/8894584
).
7.3.1.5
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 data exchange.
●
Subscriber:
Slave, which receives the data for direct data exchange from the publisher.
●
Links and access points
define the data that is used for direct data exchange.
Restrictions
● Direct data exchange in the current firmware version is only possible for inverters with
PROFIBUS communication.
● A maximum of 12 PZDs are permissible for each drive.
● To a publisher, a maximum of 4 links are possible.