Profichip VPC3+S - Page 55

PROFIBUS DP Extensions 6
VPC3+S User Manual
Revision 1.04
55
Copyright © profichip GmbH, 2012
During start-up, the VPC3+S does not go to DATA-EXCH before all
parameter telegrams and configuration telegrams have been
acknowledged.
If ‘Diag.Freeze_Mode = 1’, there is no buffer change prior to sending.
The user can read the status of the state machine cell with the following
codings for the four states: Nil, Dout_Buf_Ptr1, Dout_Buf_Ptr2 and
Dout_Buf_Ptr3. The pointer for the current data is in the 'N' state.
Address
Bit Position
Designation
7
6
5
4
3
2
1
0
08H
F
U
N
D
Din_Buffer_SM
Din_Buffer_SM, Address 08H:
bit 7-6
F: Assignment of the F-Buffer
00 = Nil
01 = Din_Buf_Ptr1
10 = Din_Buf_Ptr2
11 = Din_Buf_Ptr3
bit 5-4
U: Assignment of the U-Buffer
00 = Nil
01 = Din_Buf_Ptr1
10 = Din_Buf_Ptr2
11 = Din_Buf_Ptr3
bit 3-2
N: Assignment of the N-Buffer
00 = Nil
01 = Din_Buf_Ptr1
10 = Din_Buf_Ptr2
11 = Din_Buf_Ptr3
bit 1-0
D: Assignment of the D-Buffer
00 = Nil
01 = Din_Buf_Ptr1
10 = Din_Buf_Ptr2
11 = Din_Buf_Ptr3
Figure 6-14: Din-Buffer Management