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13.2.4 Alarms for unicast communication
Three alarms can be used when using the unicast approach (due to the continuous handshake with the inverter communications). In
a communication topology where the broadcast method is used, the alarms can be switched off due to one-sided communication
(ASC > inverter).
•
7570, PV comm error
•
7580, PV warning
•
7590, PV shutdown
Enable the alarms and configure the appropriate actions.
13.2.5 Alarms for broadcast communication
When broadcast is used and the inverters receive set points using broadcast frames, the PV Monitoring alarm can be used. This is
only the case if "PV monitoring" is switched on and receiving data back from the inverters.
If the broadcast frames are sent to a common inverter manager, for instance Fronius Data Manager Box 2.0, the ASC does not
retrieve data from the inverters. Then the alarm "PV Monitoring error" cannot be used.
•
7570, PV comm error
•
7580, PV monitoring error
Enable the alarms and configure the appropriate actions.
13.3 ESS communication
13.3.1 Modbus master, Serial 1
Using the communication interface requires the use of Modbus master for the inverters with proprietary protocols.
Terminal
Function
29
Modbus communication
31
Modbus communication
Note that the Modbus line should be properly terminated. Long lines typically with 120 Ohm in each. For short lines, it is often seen
that the termination can be removed, but it also depends on the inverter type.
Note that the Modbus ID in the inverter can be set to the same as in the ASC. The baud rate has to be the same in the ASC and the
inverter.
13.3.2 Modbus protocol and write type
Modbus transmit specifications are set in menu 7560:
•
7561, select the communication type.
COMMISSIONING GUIDELINES 4189341077D EN
Associated menus
7561, ESS protocol
7570, ESS communication error action (Modbus master)
A
7510 External communication ID and Baud rate
7520, external communication error action (Modbus slave)
B
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