Description of Components
2-7
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Switchover time on PROFIBUS-PA in redundancy mode
In the case of a master-standby switchover or failure of the active IM 157, the PA
field devices are processed via the standby IM 157.
The switchover is bumpless, i.e. the statuses of the inputs/outputs are retained
during the switchover.
The switchover time is defined as the time between activation of the standby IM
and the availability of new input data.
Condition/prerequisite Switchover time
Switchover time given an unchanged Typ.: 70 ms + number of PA field devices x 51 ms
PA configuration
Max.: 820 ms + number of PA field devices x 50 ms
Switchover time after configuration Typ.: 80 ms + number of PA field devices* x 67 ms
changes during operation
Max.: 800 ms + number of PA field devices* x
130 ms
* With unchanged PA field device addresses
Communication links from the programming device/PC to the PA field devices
Up to 10 communication links to PA field devices can be set up simultaneously
from a programming device/PC via the DP/PA link.
In the redundancy mode, all communication links from the programming device/PC
to the PA field devices remain intact when the active channel is switched over from
one IM 157 to another.
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