Configuring the fieldbus
6.1 Communication via PROFIBUS
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
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Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
6.1.4.4
Slave-to-slave communication
With "Slave-slave communication" ( also called "Data Exchange Broadcast") it is possible to
quickly exchange data between inverters (slaves) without the master being directly involved,
for instance to use the actual value of one inverter as setpoint for other inverters.
For slave-to-slave communication, in the control system you must define which inverter acts
as publisher (sender) or subscriber (receiver) - and which data or data areas (access points)
you wish to use for slave-to-slave communication. In the inverters that operate as subscriber,
you must define how the data transferred using slave-to-slave communication is processed.
Using parameter r2077, in the inverter, you can read-out the PROFIBUS addresses of the
inverters for which the slave-to-slave communication function is configured.
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Publisher Slave, which sends the data for slave-to-slave communication.
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Subscriber Slave, which receives the data from slave-to-slave communication from the
publisher.
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Links and access points define the data that are used for slave-to-slave communication.
You must observe the following restrictions for the slave-to-slave communication function:
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a maximum of 8 PZD are permissible for each drive
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To a publisher, a maximum of 4 links are possible
An example of how you configure slave-to-slave communication between two inverters in
STEP 7 is provided in Section: Configuring slave-to-slave communication in STEP 7
(Page 334).
Summary of Contents for SINAMICS G120 CU230P-2
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