SMA STP 33-US-41 - Configuring the Modbus Function

4 Operation
SMA Solar Technology AG
User ManualSTP33-62-US-41-BA-en-1138
6. If you have set the operating mode Battery bank or BatCha, make further settings:
• In the parameter group Device > Multifunction relay > Battery bank > Minimum On
power select the parameter Minimum On power for MFR battery bank or
Mlt.BatCha.Pwr and set the desired value. This will configure the power threshold from
which the battery is to be charged.
• In the parameter group Device > Multifunction relay > Battery bank > Minimum
time before reconnection select the parameter Minimum time before reconnection
of MFR battery bank or Mlt.BatCha.Tmm and set the desired value. This will
configure the minimum time which must elapse after charging the battery before the
battery can be charged again.
7. Select [Save all] to save the changes.
4.16 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 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).