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8 Operation
SMA Solar Technology AG
Operating manualSTP3-6-3AV-40-BE-en-1258
6. For system control and power limitation based on set default values, select the entry Act.
power lim. as % of Pmax or Active power limitation P in W and enter the respective
default value.
7. If the inverter itself is to limit the active power limitation to the grid-connection point, perform
the following steps:
In the dropdown list Operating mode Active power, select Act. power lim. via PV
system ctrl.
In the drop-down list Operating mode for absent system control, select the entry
Values maintained.
In the drop-down list Grid disconnection for 0% feeding select the entry No.
8.13 Configuring the ModbusFunction
The Modbus interface is deactivated by default and the communication ports 502 set.
In order to access SMA invertes with SMA Modbus
®
or SunSpec
®
Modbus
®
, the Modbus interface
must be activated. After activating 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Modbus® Interface" or in the Technical Information "SunSpec®
Modbus® Interface" at www.SMA-Solar.com.
For information on which Modbus registers are supported, see the Technical Descriptions "SMA
Modbus® Interface" or "SunSpec® Modbus® Interface" at www.SMA-Solar.com.
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.
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 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Modbus® Interface" or "SunSpec® Modbus® Interface" at
www.SMA-Solar.com).
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