TXP-CLC Course
AS AP
AS AP
M
M
Monitoring
Monitoring
logic
logic
Starcoupler
Starcoupler
OM PU
OM PU
Starcoupler
Starcoupler
Starcoupler
Starcoupler
Industrial Ethernet Bus System design and mode of
operation
As stated previously, the star couplers are connected via fiber-optic cables to
form a ring. One of these connecting paths is a redundant optical path that is
disconnected by monitoring logic. The line structure of the bus is, therefore,
maintained. The bus signals are monitored constantly on each side of the
disconnection by the monitoring logic on the optical interface cards. A special
module is not required for the monitoring logic, it is implemented in the optical
interface cards that are used as standard. The monitoring function is activated on
the interface cards at each end of the redundant optical path by toggling a DIP
switch.
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