36 Process Image WAGO-I/O-SYSTEM 750
750-461 2AI Pt100/RTD
Manual
Version 1.4.1
Table 30: I/O Module 750-461/003-000, Input Fields for Hardware Matching
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4.5 I/O Module for NTC Resistance Sensors
Table 31: I/O Module for NTC Resistance Measurement
NTC 20 kOhm
Measuring range: −30 °C … +130 °C
The measured resistance values are converted and output as temperature values
for evaluation of the NTC 20 kOhm resistance sensors. All temperature values
are represented in a standard numerical format. The possible numeric range
corresponds to the defined temperature range for the sensors of
−30 °C … +130 °C.
At the NTC 20 kOhm setting, the sensor temperature values are displayed at a
resolution of 1 digit per 0.1 °C in one word (16 bits). As a result, 0 °C
corresponds to the numeric value 0x0000 and 100 °C to 0x03E8 (dec. 1000).
Temperatures below 0 °C are represented in two's complement binary.
Table 32: Process Image for Version 750-461/020-000
Temperature
°C
Resistance
Ω
Numeric value
1)
Status
Byte
Hex.
LED
Error
AI 1, 2
1)
Temperature values below 0 °C are represented in two's complement binary.
The measured value can exceed a decimal range of −300 … +1300 before limitation takes effect.
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