SMA SUNNY TRIPOWER 60 Technical Information page 48

Troubleshooting
Modbus exception 1 "Illegal
Function" is reported in the
Modbus client.
Modbus exception 2 "Illegal
Data Address" is reported in
the Modbus client.
48 STP60-SunSpec_Modbus-TI-en-12
The NaN value 255 is reported. You may be trying to read a
configuration of a non-existent device.
Corrective measures:
• Set the Unit IDs = 125 to 167 in the Modbus client for the
desired SMA device.
• Check if the configuration read is supported by the device.
You may be trying to read from a write-only Modbus register.
Corrective measures:
• Read off the access type of the affected register from the
"Access" column of the corresponding assignment table
and correct it in the Modbus client.
You may be trying to write to a data block whose target address
range has registers that are not writable.
Corrective measures:
• Check whether all registers to be written to are writable.
You may be trying to write to a Modbus register that is not
defined in the SunSpec Modbus profile.
Corrective measures:
• Check the Modbus address to be written to in the Modbus
client for errors.
You may be trying to read or write to a data block whose start
or end address does not correspond with that of a register
(alignment not correct).
Corrective measures:
• Check the start or end address of the data block.
• Check the register at the start or end address of the data
block to be read for consistency. It may be that one of the
two registers is inconsistent.
You may be trying to write to a data block and one of the regis-
ters to be written to are not supported by the device.
Corrective measures:
• Check that the register to be written to is provided by your
SMA device (Technical Information SMA Modbus Inter-
face at www.SMA-Solar.com).
SMA Solar Technology AG
Technical Information