Profichip VPC3+C

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6 PROFIBUS DP Interface

D N U

D U

1/2

UART

Dout-Buffer

Din-Buffer

Diagnosis-

Buffer

Read_Config-

Buffer

Config-Buffer

Set-Slave-

ddress-Buffer

Parameter-

Buffer

D-N changed

by VPC3+

N-U changed

by User

changed by User

Figure 6-1: DP_SAP Buffer Structure

The VPC3+C first stores the parameter telegrams (Set_Slave_Add and

Set_(Ext_)Prm) and the configuration telegram (Chk_Cfg) in Aux-Buffer 1

or Aux-Buffer 2. If the telegrams are error-free, data is exchanged with the

corresponding target buffer (Set_Slave_Add-Buffer, Parameter-Buffer and

Config-Buffer). Each of the buffers to be exchanged must have the same

length. In the R_Aux_Buf_Sel parameter cell (see Figure 6-2) the user

defines which Aux_buffers are to be used for the telegrams mentioned

36 Revision 1.03

VPC3+C

User Manual

Profichip VPC3+C - Page 36