IBT Technologies IB798, Руководство пользователя

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INSTALLATIONS
IB798 User’s Manual 21
Bypass and WDT
The bypass function is used to link (or short) two independent Ethernet
ports when user’s application software halt or when power is off.
Block Diagram:
I/O Command
Relays are "Energized"
Normal State
Driver
Relay
WDT
Ethemet#2
Ethemet#1
Bypass
RJ45
Relays
RJ45 CN2
CN3
Communication States:
There are two communications states for the bypass function: (1)
Normal State, (2) Bypass State. A watchdog timer (WDT) is used to
control and switch the communication between the two states. A relay
array is controlled by the WDT for physically routing of the two
Ethernet ports.
The block diagram in the section above shows the Normal State, where
the two Ethernet ports work independently. The following diagram
shows the Bypass State, where the two Ethernet ports are bypassed
together.