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be obtained through messages sent from the user to the corded LAN via the
new RLM.
Until this occurs, messages from the switched LAN are still forwarded to the
mobile user along the previous communication path. The mobile user can no
longer be contacted via this route, however.
In the case of a switched transmission (ISO or ISO on RFC1006 protocol),
this interruption can last for up to 10 seconds. With non-switched
transmission, the switch "ageing time" determines the downtime of the
transmission in the transmission path. The ageing time determines how long
an address should be stored in the switch address table. If the ageing time
for an address expires before the switch has recognised a message with the
associated source address, this address is deleted from the address table.
Any future messages sent to this address are distributed to all switch ports
(the exact transmission path is unknown). The ageing time of SIMATIC NET
OSM/ESM is parameterisable and ranges from 40 to 80 seconds. The
ageing time should be assigned a low value in order to minimise interruption
times.
Industrial Ethernet Wireless LAN Radio Link Module RLM
C79000-G8976-C170-01
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