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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).
PS
AM
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
PS
EM
PS
AM
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!