IEC09000758-4-en.vsd
Switch A
AP1
PhyPortB
PhyPortA
AP1
PhyPortA
PhyPortB
AP1
PhyPortB
PhyPortA
AP1
PhyPortA
PhyPortB
Switch B
Device 1
Device 2
Device 3
Device 4
IEC09000758 V4 EN-US
Figure 337: Redundant station bus
IEC 62439-3 High-availabillity Seamless Redundancy (HSR)
HSR applies the principle of parallel operation to a single ring.
For each message sent, the node sends two frames, one through each port. Both the
frames circulate in opposite directions over the ring. Every node forwards the
frames it receives from one port to another to reach the next node. When the
originating sender node receives the frame it sent, the sender node discards the
frame to avoid loops
The RCHLCCH function block supervise the redundant communication on the two
channels. If no data package has been received on one (or both) channels within the
last 10 s, the output LinkAUp and/or LinkBUp is set to 0 which indicates an error.
If IEEE1588 (PTP) is used an accuracy of 1 µs can be guaranteed for up to 15
devices in one HSR-ring.
1MRK 506 382-UEN A Section 16
Ethernet
Line distance protection REL650 2.2 IEC 661
Technical manual
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