Danfoss FC 300 Profibus Manual page 52

FC 300 Profibus
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.
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 Request parameter value (array word)
8 Request 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.
52
How to Access FC 300 Parameters
MG.33.C2.02 - VLT is a registered Danfoss trademark
Re- Function
sponse
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