Siemens SIMATIC NET PROFIBUS - Manual (Page 51)

Topologies of SIMATIC NET PROFIBUS Networks
2-25
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
2.5.4 DP/PA Link
Definition
The DP/PA link consists of the IM 157 and up to a maximum of five DP/PA
couplers. The DP/PA link is a DP slave at the PROFIBUS-DP side and a PA
master at the PROFIBUS-PA side.
Uses
With the DP/PA link, you have an isolated interconnection between PROFIBUS-PA
and PROFIBUS-DP with transmission rates of 9.6 Kbps to
12 Mbps.
The DP/PA link can only be used in SIMATIC S7.
Figure 2-16 below shows where the DP/PA link fits in.
PROFIBUS-DP
ET200X
Field level
Industrial Ethernet
IM 157
DP/PA coupler
1 2 3 4 5
PROFIBUS-PA
Field devices of PROFIBUS-PA
“Programming, Operating
and Monitoring”
SIMATIC PCS 7 or other
tool for parameter assign-
ment
PDM or other tool for para-
meter assignment
DP/PA Link
S7-DP master
Cell level
Process control
level
Gateway
S7-400
Figure 2-16 Location of the DP/PA Link
The DP/PA link must be installed outside the hazardous area.
The DP/PA link is configured with STEP 7, Version 4.02 or higher.