WAGO-I/O-SYSTEM 750
Process Image 27
750-461 2AI Pt100/RTD
Manual
Version 1.4.1
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4
Process Image
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The I/O module transfers 16 bits per channel of measured data and, optionally, 8
status bits to the fieldbus coupler/controller. Access to the status bits depends on
the specific fieldbus system.
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Mapping of process data in the process image of fieldbus systems
The representation of the I/O modules’ process data in the process image
depends on the fieldbus coupler/controller used. Please take this information as
well as the particular design of the respective control/status bytes from the
section “Fieldbus Specific Design of the Process Data” included in the description
concerning the process image of the fieldbus coupler/controller used.
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4.1
I/O Modules with Pt Resistance Sensors
Table 16: I/O Modules with Pt Resistance Sensors
750-461
Evaluation Pt100
Measuring range: −200
°C to +850 °C
750-461/000-003
Evaluation Pt1000
Measuring range: −200
°C to +850 °C
750-461/000-006
Evaluation Pt100, optimized temperature drift
(0.001 %/K, conversion time 960 ms)
Measuring range: −200
°C to +850 °C
750-461/000-200
Evaluation Pt100, with status information for
S5-FB250 in the data word
Measuring range:
−200
°C to +850 °C
750-461/025-000
Evaluation Pt100, extended temperature range
Measuring range: −200
°C to +850 °C
4.1.1
Pt100
The I/O modules 750-461and the versions 750-461/000-006 and 750-461/025-
000 calculate the resistance values of Pt100 sensors and output the data as
temperature values. The temperature values are displayed at a resolution of 1
digit per 0.1 °C in one word (16-bit). Temperature values below 0 °C are
represented in two's complement binary. As a result, 0 °C corresponds to the
numeric value 0x0000 and 100 °C to the numeric value 0x03E8 (dec. 1000). The
possible numeric range corresponds to the defined temperature range of
−
200 °C
to +850 °C for Pt100 sensors.
