Platinum Resistance Temperature Detector (Rtd); Figure 2 - Processing In The Plc; Figure 3 - Processing In The Plc - Honeywell 2MLF-RD4A User Manual

1. Introduction
1.3. Terminology
Analog values cannot be given as input to the CPU module, as the PLC processes only
binary numbers (digital values). The conversion from analog to digital value (as shown in
Figure 3) is required. This is done using analog to digital converter (A/D conversion
module). Similarly, to get an analog output from a digital value, a digital to analog (D/A)
conversion module is used.

Platinum resistance temperature detector (RTD)

RTD is a sensor that detects temperature. The change in the resistance value of this
device is directly proportional to the temperature. The resistance of these devices
increases with temperature. At 0°C temperature, Pt100/JPt100 has the resistance value of
100.00Ω
20 Resistance Temperature Detector 2MLF-RD4A User's Guide
Figure 2 – Processing in the PLC
Figure 3 – Processing in the PLC
Honeywell
R200
September 2010