Process Image; Configuration For Pt Resistance Sensors - WAGO -I/O-SYSTEM 750 750-481/003-000 Manual

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Process Image

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6 Process Image
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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.
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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.
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.
WAGO-I/O-SYSTEM 750
750-481/003-000 2AI RTD Ex i
Manual
1.1.0