Danfoss VLT PROFIBUS DP MCA 101 Programming Manual page 31

Parameter Access
- PVA: The PVA portion transmits word-
size parameter values in bytes 7 and 8,
while long word size values require
bytes 5–8 (32 bits).
-
IND: When the response/request
contains array elements, the IND carries
the array sub-index. When parameter
descriptions are involved, the IND holds
the record sub-index of the parameter
description.
5.3.4 RC Content
Request
The content of the RC portion of the PCA word for a
request is listed in Table 5.15.
Request Function
0 No request
1 Request parameter value
2 Change parameter value (word)
3 Change parameter value (long word)
4 Request description element
5 Change description element
6 Request parameter value (array)
7 Change parameter value (array word)
8 Change parameter value (array long word)
9 Request number of array elements
10-15 Not used
Table 5.15 Request
Response
When the follower rejects a request from the master, the
RC word in the PPO-read indicates the rejection by
assuming the value 7. Bytes 7 and 8 in the PVA element
carry the fault number.
The content of the RC portion of the PCA word for a
response is listed in Table 5.16.
MG37G102
Programming Guide
Response
0
1
2
3
4
5
6
7
8
9
10
11
12
13-15
Table 5.16 Response
Fault Interpretation
numb
er
0 Illegal PNU
1 Parameter value cannot be changed.
2 Upper or lower limit exceeded.
3 Subindex corrupted.
4 No array
5 Data type false
6 Cannot be set by user (reset only).
7 Description element cannot be changed.
8 IR required PPO-write not available.
9 Description data not available.
10 Access group
11 No parameter write access
12 Key word missing.
13 Text in cyclical transmission not readable.
14 Name in cyclical transmission not readable.
15 Text array not available
16 PPO-write missing
17 Request temporarily rejected
18 Other fault
19 Data in cyclical transmission not readable.
130 There is no bus access to the parameter called.
131 Data change is not possible because factory set-up has
been selected.
Table 5.17 Fault Numbers
5.3.5 Example
This example shows
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Function
No response
Transfer parameter value (word)
Transfer parameter value (long word)
Transfer description element
Transfer parameter value (array word)
Transfer parameter value (array long word)
Transfer number of array elements
Request rejected (including fault number, see
Table 5.17)
Not serviceable by PCV interface
Not used
Not used
Not used
Not used
Not used
5 5
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