SMA Solar Technology AG Troubleshooting
6 Troubleshooting
Cause and corrective measures
The Inverter Manager cannot
be accessed by the Modbus
client.
The correct IP address for the Inverter Manager may not be set in
the Modbus client.
Corrective measures:
• Read off the IP address of the Inverter Manager (see router
manual).
Ensure that the correct IP address for the Inverter Manager is set
in the Modbus client (see the Modbus client manufacturer's
manual).
The firewall may not be set correctly.
Enable port 502 in the firewall (see firewall manual).
The Inverter Manager does not
send a reply within the reply
time specified by the Modbus
client.
The Modbus server in the Inverter Manager may be currently
overloaded.
Corrective measures:
• Extend the response time set in the Modbus client succes-
sively by one second respectively.
A NaN value is reported in the
Modbus client (see Section
3.6 "SunSpec Data Types and
NaN Values", page 13).
You may be trying to read from a Modbus register that is not
supported by the inverter.
Corrective measures:
• Contrast and compare the available measured values for
your SMA device with the Modbus registers requested by
this SMA device (see Section 5 "STP60 SunSpec Modbus
Profile – Assignment Tables", page 15).
You may be trying to read from a Modbus register that is not
defined in the SunSpec Modbus profile.
Corrective measures:
• Remove the register address used from the data pro-
cessing.
• Install a newer version of the Modbus profile via a firm-
ware update.
Technical Information STP60-SunSpec_Modbus-TI-en-12 47
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