SMA SUNNY TRIPOWER 5.0 SMART ENERGY - Configuring the Modbus Function

9 Operation
SMA Solar Technology AG
Operating ManualSTPx0-3SE-40-BE-en-1082
If the voltage of the electrical circuits of the backup loads is not in the permitted range between
170V and 277V, the contactor opens. In order for the contactor to close again, the voltage must
be in the permitted range for at least 20s.
OFF
ON
20 s >170 V
170 V
20 s <277 V
277 V
OFF
>0.1 s >0.1 s
Contactor closed
Contactor open
Contactor open
Figure 23: Behavior of the contactor between the AC backup terminal and the connection to the utility grid
when the voltage is too high or too low
9.17 Configuring the ModbusFunction
The Modbus interface is deactivated by default and the communication ports 502 set.
In order to access SMA inverters with SMA Modbus
®
or SunSpec
®
Modbus
®
, the Modbus interface
must be enabled. After enabling the interface, the communication ports of both IP protocols can be
changed. For information on commissioning and configuration of the Modbus interface, see the
technical information "SMA and SunSpec Modbus® Interface" at www.SMA-Solar.com.
For information on which Modbus registers are supported, see the technical information "Modbus®
parameters and measured values" at www.SMA-Solar.com.
Measures for data security during activated Modbus interface
If you activate the Modbus interface, there is a risk that unauthorized users may access and
manipulate the data or devices in your PV system.
To ensure data security, take appropriate protective measures such as:
• Set up a firewall.
• Close unnecessary network ports.
• Only enable remote access via VPN tunnel.
• Do not set up port forwarding at the communication port in use.
• In order to deactivate the Modbus interface, reset the inverter to the default settings or
deactivate the activated parameter again.
Procedure:
• Activate the Modbus interface and adjust the communication ports if necessary (see the
technical information "SMA and SunSpec Modbus® Interface" at www.SMA-Solar.com).