I/O Modules For Pt Resistance Sensors - WAGO 750-461 Manual

14 • 750-461, (/xxx-xxx) [2 AI Pt100/ RTD]
Process Image
Attention
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 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
corresponding coupler/controller.

2.1.2.7.1 I/O Modules for Pt Resistance Sensors

Pt resistance sensors (Measuring range: -200 °C ... +850 °C)
750-461
750-461/000-003 Evaluation of Pt 1000
750-461/000-006 Evaluation of Pt 100, high precision
750-461/000-200 Evaluation of Pt 100, with status information
To evaluate the platinum resistance sensors (750-461, 750-461/000-003 and
750-461/000-006) 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 or Pt 1000 setting, 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.
The measured values of the resistance are directly sent by the 750-461/000-
200 (Pt 100) module.
Evaluation of Pt 100
(0.001%/K) (Conversion time 960ms)
for S5-FB250
WAGO-I/O-SYSTEM 750
I/O Modules