118 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
System bus connection
System bus
The functional components of the gas analyzer, i.e. the electronics module,
the external I/O devices and the analyzer modules communicate with each
other via the system bus.
The system bus structure is linear with a maximum length of 350 m.
One system housing
The system bus connection is established at the factory if the electronics
module and an analyzer module are installed in one system housing.
In this case a terminating resistor should be installed in the system bus
connector of the electronics module (supplied with the unit).
PSAM EM
BUS
AM Analyzer module
EM Electronics module
PS Power supply
BUS System bus (internal)
Terminating resistor
Multiple system housings
If the electronics module and the analyzer module are accommodated in
several system housings, they must be interconnected externally via the
system bus.
BUS
PSEMPSAM
AM Analyzer module
EM Electronics module
PS Power supply
BUS System bus (external)
Terminating resistors
ATTENTION
Only one electronics module should be connected to a system bus struc-
ture. Multiple electronics modules should never be interconnected via the
system bus!
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