32
Process Image
WAGO-I/O-SYSTEM 750
750-481/003-000 2AI RTD Ex i
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Po
6 Process
Image
Po
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Mapping of process data in the process image of fieldbus systems
The representation of the process data of some I/O modules or their variations in
the process image depends on the fieldbus coupler/controller used. Please take
this information from the section "Fieldbus Specific Design of the Process Data"
included in the description concerning the process image of the corresponding
coupler/controller.
Po
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Evaluation of Status Byte
Some fieldbus systems can process status information of process value by means
of a status byte.
This status byte can be displayed via the commissioning tool
WAGO-I/O-
CHECK
.
However, processing via the fieldbus coupler/controller is optional, which means
that accessing or parsing the status information depends on the fieldbus system.
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The input module 750-481/003-000 transmits 16-bit measured values and 8
optional status bits per channel.
Po
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6.1
Configuration for Pt Resistance Sensors
To evaluate the platinum resistance sensors, the measured values of the resistance
are converted and sent as temperature values. All temperature values are
represented in a standard numeric format. The possible numerical range matches
the defined temperature range of the Pt sensors from -200 °C to +850 °C..
In the Pt 100, Pt 200, Pt 500 and Pt 1000 settings, the temperature values of the
sensors are represented with a resolution of 1 digit per 0.1 °C within a word (16
bits). Thus, 0 °C corresponds to the numeric value 0x0000 and 100 °C to 0x03E8
(dec. 1000). Temperature values below 0 °C are represented in two’s complement
binary form.
Manual
1.1.0