Profichip VPC3+S - Page 48

6 PROFIBUS DP Extensions
48
Revision 1.04
VPC3+S User Manual
Copyright © profichip GmbH, 2012
Parameter Data Processing Sequence
In the case of a positive validation of more than seven data bytes, the
VPC3+S carries out the following reaction:
The VPC3+S exchanges Aux-Buffer 1/2 (all data bytes are entered here)
for the Parameter-Buffer, stores the input data length in R_Len_Prm_Data
and triggers the New_Prm_Data interrupt. The user must then check the
User_Prm_Data and either reply with User_Prm_Data_Okay_Cmd or with
User_Prm_Data_Not_Okay_Cmd. The entire telegram is entered in this
buffer. The user parameter data are stored beginning with data byte 8, or
with byte 10 if DPV1_Status bytes used.
The user response (User_Prm_Data_Okay_Cmd or
User_Prm_Data_Not_Okay_Cmd) clears the New_Prm_Data interrupt.
The user cannot acknowledge the New_Prm_Data interrupt in the IAR
register.
With the User_Prm_Data_Not_Okay_Cmd message, relevant diagnosis
bits are set and the DP_SM branches to WAIT-PRM.
The User_Prm_Data_Okay and User_Prm_Data_Not_Okay acknow-
ledgements are read accesses to defined registers with the relevant
signals:
User_Prm_Finished:
No additional parameter telegram is present.
Prm_Conflict:
An additional parameter telegram is present,
processing again
Not_Allowed:
Access not permitted in the current bus state
Address
Bit Position
Designation
7
6
5
4
3
2
1
0
0EH
0
0
0
0
0
0
User_Prm_
Data_Okay
0
0
User_Prm_Finished
0
1
Prm_Conflict
1
1
Not_Allowed