42/24-10 EN Rev. 9 Chapter 4: Electrical Connection 4-9
Standard Terminal Connections
Basic Principles The terminal connections are allocated
• in the order of the registered analyzer modules and
• within an analyzer module, in the order of the sample components.
The order of the analyzer modules and sample components is documented in the
analyzer data sheet and on the type plate. Beginning with analyzer module 1 and
sample component 1, the input and output functions are first of all allocated in turn
to available free connections of the I/O modules (slots –X20 to –X29).
Profibus, Modbus The slot of the optional Profibus module is always –X20. The slot of the optional
Modbus module is –X20, or –X22 if a Profibus module is present.
Analog Outputs Analog outputs are available at the 2-way analog output module or the 4-way
analog output module. An analog output is allocated for each sample component
in the order of the sample components.
Alarm Values Alarm values are available at the digital I/O module “Status signals/external
calibration” (if the gas analyzer has been set to collective status during the
installation of an analyzer module) or the digital I/O module “Alarm values”. An
alarm value is allocated for each sample component in the order of the sample
components.
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: Measuring range 1,
NO closed: 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
Standard Application
Measuring Range
Control
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 I/O Module Assignment for 2nd 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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