ibaBM-DPM-S Manual
Issue 2.11
73
12 Redundancy mode
Note
The following description provides you with general information on the operation of the
ibaBM-DPM-S device in redundancy mode. You will find detailed information about differ-
ences and special features in comparison to operation on the normal PROFIBUS.
For understanding the following description, we suppose that you have basic knowledge in
using the ibaBM-DPM-S device.
The redundancy mode of ibaBM-DPM-S and ibaPDA-V6 is required if you want to capture
data of redundant PROFIBUS systems of a SIMATIC S7-400H control.
Without the redundancy mode, data can also be captured. The disadvantage is that data
have to be captured by each of the both PROFIBUS systems. When analyzing data, the
user has to decide which of the two data sets is valid.
In the redundancy mode, ibaBM-DPM-S decides automatically and dynamically for each
slave, which PROFIBUS system sends the valid data sets. Only valid data are sent to
ibaPDA-V6 for recording.
ibaBM-DPM-S recognizes situations like the passage of a S7-400H CPU to STOP, the
failure of a slave connection (e.g. IM153-2 for a redundant ET200) or a broken cable. It
then changes dynamically the bus system used for data capturing.
In case, valid data are recognized on both bus systems, the 0 bus system (connected to
the X40 plug) is preferred.
In the redundancy mode, „Sniffing“ an existing Master/Slave communication can be done.
You can also use active slaves in ibaBM-DPM-S for sending internal data of the control di-
rectly to ibaPDA-V6.
Note
Concerning the connection of ibaBM-DPM-S to the redundant PROFIBUS, please take
account of the notes in chapter 8.1.3 “Connection to the DP master and other DP slaves
on the redundant PROFIBUS”.
When using active slaves on ibaBM-DPM-S, you have to take measures in the program of
the S7-400H CPU, for preventing an eventual failure of an active slave (e.g. over OB85).
This is necessary for preventing negative influences on the rest of the program.
Note
Due to the system, for some cycles zero values or „frozen“ values might be recorded
when changing the active bus system (e.g. when a S7-400H CPUs passes to the STOP
status) .
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