Variants Of The Ring/Network Coupling - Hirschmann RS20 User Manual

Ring/Network Coupling 5.1 Variants of the ring/network
coupling
5.1 Variants of the ring/network
coupling
The redundant coupling is effected by the one-Switch coupling of two ports
of one device in the first ring/network segment to one port each of two
devices in the second ring/network segment (see figure 23). One of the two
connections – the redundant one – is blocked for normal data traffic in normal
operation.
If the main line no longer functions, the device opens the redundant line
immediately. If the main line functions again, the redundant line is again
blocked for normal data traffic and the main line is used again.
The ring coupling detects and handles an error within 500 ms (typically
150 ms).
The redundant coupling is effected by the two-switch coupling of one port
each from two devices in the first ring/network segment to one port each of
two devices in the second ring/network segment (see figure 29).
The device in the redundant line and the device in the main line use control
packets to inform each other about their operating states, via the Ethernet or
the control line.
If the main line no longer functions, the redundant device (slave) opens the
redundant line immediately. As soon as the main line is working again, the
device in the main line informs the redundant device of this. The redundant
line is again blocked for normal data traffic and the main line is used again.
The ring coupling detects and handles an error within 500 ms (typically
150 ms).
The type of coupling configuration is primarily determined by the topological
conditions and the desired level of availability (see table 7).
UM RedundConfig L2P
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Release 8.0 05/2013