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SMA Solar Technology AG
Damage of SMA products due to cyclical changing of parameters
The writable Modbus registers (RW) of the SMA products are intended for long-term storage of device settings.
Cyclical changing of these parameters leads to destruction of the flash memory of the SMA products. The following
parameters are excluded. The parameters may be changed cyclically.
• Information model 123:
Conn
WMaxLimPct
OutPFSet
VArWMaxPct
VArMaxPct
• Information model 704:
WMaxLimPct
WSet
WSetPct
VarSetPct
PF + Ext (WInj, Power factor & excitation setpoint when injecting active power)
PF + Ext (WAbs, Power factor & excitation setpoint when absorbing active power)
Access to data points after activating the Modbus interface
After activating the Modbus interface, the read and write access to all data points is possible without further input
of a password via Modbus.
Deactivating the Modbus interface by resetting the SMA product
When the SMA product is reset to the default settings, the Modbus interface is deactivated.
• If the Modbus interface is to be used after the reset, reactivate the Modbus interface.
3 Information on the activation of the SunSpec Modbus
The Modbus interface of SMA products is deactivated by default. To use the Modbus interface and to communicate
with the products via SunSpec Modbus, you must activate Modbus as the type of communication and set the TCP port.
If you have a system in which the inverters are addressed via the Modbus Unit ID instead of via the IP address, the Unit
ID must be set in addition to the TCP port. The Unit ID in the SunSpec Modbus profile is 126.
4 Determine Modbus devices
Following the instructions listed below helps detect the Modbus devices. For further information on Modbus ennexOS,
see the Technical Information "SMA Modbus® Interface - ennexOS" at www.SMA-Solar.com.
Procedure:
1. Select at the system level the menu item Device administration in the menu Configuration.
2. Add and configure Modbus devices via the button
3. Select [Modbus devices].
4. Select [Continue] .
5. Select the Modbus profile. If necessary, import the saved Modbus profiles via [Modbus profile management]
or create a new Modbus profile.
6. If necessary, change the IP address.
7. If necessary, change the port (default setting: 502).
8. If necessary, change the unit ID (default setting: 1).
Technical Information
3 Information on the activation of the SunSpec Modbus
NOTICE
. Note the information on the user interface of the inverter.
ennexOS-SunSpec-Modbus-TI-en-10
5
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