8.1.3 Error message
Encoding of error messages in response data set PWE-Low/Low-Byte in byte 7 (Slave
Master):
according to
non-permissible parameter number PNU
Parameter value cannot be edited
lower or upper parameter value limit exceeded
no data set switchable parameter
system bus does not respond
Parameter cannot be read:
Error when reading EEPROM
Error when writing EEPROM
EEPROM checksum error occurred
Parameter must not be written in operation
Values of data sets are different
Error number “20” may have different causes.
•
If you do not use System Bus: Check if the low byte is “0” (zero). With values greater
than zero, an attempt is made
to address a System Bus client instead of the
PROFINET client.
• If you use System Bus (e.g. via an EM-SYS module), the addressed device is not r
sponding. Check if the addressed device is connected to power supply and the Sy
tem Bus node addresses in the index low byte and in the parameter settings of
device to be addressed correspond to one another.
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