SMA STP 50-40 - Configuring the Modbus Function

8 Operation
SMA Solar Technology AG
Operating manual STP50-4x-BE-en-23 81
6. In Self-consumption or SelfCsmp operating mode: In the parameter group Device >
Multifunction relay > Self-consumption > Minimum On power, select the parameter
Minimum On time for MFR self-consumption or Mlt.MinOnTmm and set the desired
value. This determines the minimum time for which the load remains switched on.
7. In Control via communication or ComCtl operating mode: In the parameter group Device
> Multifunction relay > Control via communication > Status, select the parameter Status
of MFR with control via communication or Mlt.ComCtl.Sw and set the desired value. This
determines whether the multifunction relay can be controlled via a communication product.
8. In Battery bank or BatCha operating mode: 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 determines the power threshold at which the battery is supposed to be charged.
9. In Battery bank or BatCha operating mode: 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 sets the minimum time which must elapse
after charging the battery before battery charging can resume.
10. Select [Save all] to save the changes.
8.19 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).