AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 115
Standard application "Measuring range control"
Measuring range control can be implemented for all sample components
with more than one measuring range. Each Digital I/O module includes
• 4 digital inputs (DI) for the measuring range switch-over and
• 4 digital outputs (DO) for the measuring range feedback signal.
Sample component with Assignment DI and DO configuration
2 measuring ranges 1 DI and 1 DO NO open:
NO closed:
Measuring range 1,
Measuring range 2
3 measuring ranges 3 DI and 3 DO NO closed: Active meas. range
4 measuring ranges 4 DI and 4 DO NO closed: Active meas. range
The measuring range control is not installed across I/O modules.
Example: A gas analyzer contains 4 sample components with the following
number of measuring ranges:
Sample components Number of measuring ranges
Sample component 1 (SC1) 3 measuring ranges (MR1, MR2, MR3)
Sample component 2 (SC2) 3 measuring ranges (MR1, MR2, MR3)
Sample component 3 (SC3) 2 measuring ranges (MR1, MR2)
Sample component 4 (SC4) 2 measuring ranges (MR1, MR2)
The following connection assignments result from this:
Assignment for
1st Digital I/O Module
Assignment for
2nd Digital I/O Module
DI/DO 1: SC1: MR1 DI/DO 1: SC2: MR1
DI/DO 2: SC1: MR2 DI/DO 2: SC2: MR2
DI/DO 3: SC1: MR3 DI/DO 3: SC2: MR3
DI/DO 4: SC3: MR1, MR2 DI/DO 4: SC4: MR1, MR2
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