
Active Components and Topologies
6-21
SIMATIC NET Tw isted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
How Standby Redundancy Works
One of the two OSMs/ESMs must be set to the standby mode by setting the DIP
switch. This OSM/ESM forms the redundant link that only transfers data when the
other path (main link) fails. The OSM/ESM in the standby mode receives
information about the state of the main link via the synchronization connection
between the standby-sync ports. If the main link fails, the redundant OSM/ESM
activates the standby link within 0.3 seconds.
If the problem is eliminated on the main link, this also causes a signal on the
synchronization connection. The main link is enabled again and the standby link
disabled.
Faults Managed by the Redundancy Function
The following problems on the main link activate the standby link:
S Main OSM/ESM without power
S Cable break at a cascaded port of the main OSM/ESM
S Defective or deactivated partner on a cascaded port of the main OSM/SM.
6.2.8 Components of the OSM/ESM
SIMA TIC NET Industrial Ethernet OSM/ESM including
S Terminal block for the power supply
S Fittings for wall mounting
S Product information bulletin
S CD with Operating Instructions and “Network Management” Manual
Order number
SIMATIC NET Industrial Ethernet OSM See catalog IK PI
SIMA TIC NET Industrial Ethernet ESM See catalog IK PI
Accessories
SIMA TIC NET ITP Standard Cable
SIMA TIC NET ITP XP Standard Cable
SIMATIC NET FIBER OPTIC Glass FOC
SIMA TIC NET TP Cord
SIMATIC NET FC Outlet RJ-45
SIMATIC NET FC TP Cables
For ordering data, refer to catalog IK PI.
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