Operation of the DP/PA Link and the Y Link
8-12
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
8.7.2 System changes in redundant operation
The table below shows the steps necessary to add a completely new DP/PA link or
Y link together with the underlying master system to an existing system during
operation.
Step Activity
1 Install the new link.
2 Connect the power supply of all modules.
3 DP/PA link only
Connect the PROFIBUS-PA to the new
DP/PA coupler.
Y link only
Connect the bus connector of the
underlying DP master system to the
PROFIBUS-DP interface of the new Y
coupler.
4 Connect the bus connector of the active channel of the redundant DP master
system to the PROFIBUS-DP interface of one of the two IM 157 modules.
5 Connect the bus connector of the passive channel to the PROFIBUS-DP
interface of the other IM 157.
This procedure is summarized under “Reconfiguring hardware” in the section
entitled “System changes during operation” in the S7-400H Automation System,
High-Availability Systems manual. Here you will also find a detailed description of
the overall procedure for making a system change.
8.8 IM 157 firmware update
A firmware update is available for IM 157 as of order number
6ES7 157-0AA82-0XA0. You will require STEP 7, version V5.2 or higher.
A firmware update is not possible in the DP/PA link in redundant operation and in
the Y link.
When should you upgrade the IM 157 firmware?
You should upgrade the IM 157 to the newest firmware version after a (compatible)
enhancement of functions or after improvements to the performance.
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