GE Industrial Solutions AF-600 FP Profibus DP - Manual (Page 52)

5.3.3 Request / Response Handling
The RC portion of the PCA word defines the requests that may be issued from the master to the slave as well as what other portions of the PCV (IND and PVA) are
involved. The PVA portion will transmit word-size parameter values in bytes 7 and 8, while long word size values require bytes 5 to 8 (32 bits). If the Response /
Request contains array elements, the IND will carry the Array Sub-index. If parameter descriptions are involved, the IND will hold the Record Sub-index of the
parameter description.
5.3.4 RC Content
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
If the slave rejects a request from the master, the RC word in the PPO-read
will indicate this by assuming the value 7. The fault number will be carried by
bytes 7 and 8 in the PVA element.
Response Function
0 No response
1 Transfer parameter value (word)
2 Transfer parameter value (long word)
3 Transfer description element
4 Transfer parameter value (array word)
5 Transfer parameter value (array long word)
6 Transfer number of array elements
7 Request rejected (incl. fault #, see below)
8 Not serviceable by PCV interface
9 Not used
10 Not used
11 Not used
12 Not used
13-15 Not used
Fault
no. Interpretation
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 network access to the parameter called
131 Data change is not possible because factory setup has been
selected
AF-650 GP/AF-600 FP Profibus DP Operating Instructions
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