STP60 SunSpec Modbus Profile – Assignment Tables SMA Solar Technology AG
RO: Read only
RW: Read and write
If an access type is not allowed, a Modbus exception is generated in
the event of access with an access type that is not allowed.
Offset of the Modbus register numbers (No.)
For the reading or writing of Modbus registers, use the register numbers reduced by the
offset 1 in each case. Example: Modbus register address = register number in the STP60
SunSpec Modbus profile – offset = 40001 – 1 = 40000.
Reactive power in the SunSpec Modbus profile
For all SunSpec Modbus registers of the Inverter Manager and of the STP60 in which a
reactive power is measured or specified, a positive reactive power is "lagging" and a nega-
tive reactive power is "leading" as per the IEC convention and generator reference-arrow
system.
This information is valid for the following SunSpec Modbus registers: 40354 and 40359.
16 STP60-SunSpec_Modbus-TI-en-12 Technical Information
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