Connection to a fieldbus
6.4 Communication via RS485
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
137
Table 6- 21 Response identifier (inverter → master)
Response identifier Description
0
No response
1
Transfer parameter value (word)
2
Transfer parameter value (double word)
3
Transfer descriptive element
1)
4
Transfer parameter value (field, word)
2)
5
Transfer parameter value (field, double word)
2)
6
Transfer number of field elements
7
Request cannot be processed, task cannot be executed (with error number)
1) The required element of the parameter description is specified in IND (second word).
2) The required element of the indexed parameter is specified in IND (second word).
If the response ID = 7, then the inverter sends one of the error numbers listed in the
following table in parameter value 2 (PWE2).
Table 6- 22 Error numbers for the response "Request cannot be processed"
No.
Description
Comments
0
Impermissible parameter number (PNU)
Parameter does not exist
1
Parameter value cannot be changed
The parameter can only be read
2
Minimum/maximum not achieved or
exceeded
–
3
Wrong subindex
–
4
No field
An individual parameter was addressed with
a field request and subindex > 0
5
Wrong parameter type / wrong data type Confusion of word and double word
6
Setting is not permitted (only resetting)
Index is outside the parameter field[]
7
The descriptive element cannot be
changed
Description cannot be changed
11
Not in the "master control" mode
Change request without "master control"
mode (see p0927)
12
Keyword missing
–
17
Request cannot be processed on account
of the operating state
The actual inverter operating state is not
compatible with the received request
20
Illegal value
Modification access with a value which is
within the value limits but which is illegal for
other permanent reasons (parameter with
defined individual values)
101
Parameter number is currently
deactivated
Dependent on the operating state of the
inverter
102
Channel width is insufficient
Communication channel is too small for
response
104
Illegal parameter value
The parameter can only assume certain
values.