ABB LD 800HSE, Manual

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Device Redundancy Appendix B Limits and Performance Data
100 3BDD011677-600 A
The redundancy switching time is:
• t
rs
≤
300 ms.
1
The macrocycle duration depends on the configuration and is usually in the range of
200 ms to 1000 ms.
Typical configurations with macro cycles of up to 1000 ms result in inactivity
periods (related to a single process value) between 1 and 2 seconds.
Figure 37 shows the situation for a switch-over time (t
fd
+ t
rs
) of 1000 ms and a
macro cycle duration (t
mc
) of 1000 ms. In that case typically one cycle of published
data will be lost. If the macro cycle duration is 500 ms (dotted lines), two cycles will
be lost.
Device Redundancy
The following fault conditions cannot be detected in the linking device itself and
need to be covered at application level:
• a loss of an H1 connection between the Primary Device and a subset of devices
on an H1 link
1. Fault detection time for loss of Ethernet connection reduced from 1500ms to 500ms with this version Product
version
1. Redundancy switching time reduced from 500ms to 300ms with this version Product version
Figure 37. Duration of Redundancy Switch-over