ELECTRICAL CONNECTIONS
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3.4 Topology of FF networks
An example of mixed topology of FF networks is shown in the following example.
Connection is best made via short branch cables and T connectors. This connection type makes it
possible to connect and disconnect the devices without interrupting the bus or the
communication.
1
HSE network
2
H1 bus
3
Intrisically safe, explosive area
B1+B2
Bridge = coupling element for H1 bus
and HSE network
D1-D3
Device = field devices, own power
supply, for non potentially explosive
areas
D4-D6
Intrinsically safe devices, external
power supply, for potentially explosive
areas
I.S.
Intrinsically safe barrier
JB
Junction box for field devices
PS
Power supply
Switch = connection of multiple HSE
sub networks
T
Terminator
