Profichip VPC3+C User Manual page 45

According to IEC 61158, Static Diagnosis should only be used during
s tart-up.
Status coding for the diagnosis buffers is stored in the Diag_Buffer_SM
control parameter. The user can read this cell with th
b oth buffers: User, VPC3+, or VPC3+_Send_Mode.
Address
bit 7-4
bit 3-2
bit 1-0
Figure 6-9: Diagnosis Buffer Assignment
The New_Diag_Cmd is also a read access to a defined control parameter
indicating which Diagnosis-Buffer belongs to the user after the exchange or
whether both buffers ar
D iag_Buf1, Diag_Buf2).
Address
Figure 6-10: Coding of New_Diag_Cmd
VPC3+C User Manual
Copyright © profichip GmbH 2004-2006
7 6
0CH 0 0
Diag_Buffer_SM, Address 0CH:
Don't care: Read as '0'
f2: Assignment of Diagnosis Buffer 2
Diag_Bu
00 = Nil
01 = User
10 = VPC3+
11 = VPC3_Send_Mode
f1: Assignment of Diagnosis Buffer 1
Diag_Bu
00 = Nil
01 = User
10 = VPC3+
11 = VPC3_Send_Mode
7 6
0DH 0 0
Revision 1.03
PROFIBUS DP Interface 6
Bit Position
5 4 3 2
0 0 Diag_Buf2
e currently assigned to the VPC3+C (No_Buffer,
Bit Position
5 4 3 2
0 0 0 0
e possible codings for
Designation
1 0
Diag_Buf1 Diag_Buffer_SM
Designation
1 0
New_Diag_
⇓ ⇓
Buffer_Cmd
0 0 No_Buffer
0 1 Diag_Buf1
1 0 Diag_Buf2
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