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RIO-47100 User Manual Download Page 110](http://html1.mh-extra.com/html/galil-motion-control/rio-47-series-rio-47100/rio-47-series-rio-47100_user-manual_558776110.webp)
Dimensions
Figure A1.3: Dimensions for SCB-48206
Operation
The SBC-48206 will send a 0-5V analog voltage to the RIO that is related to the resistance of the RTD.
When using the SBC-48026, the analog inputs should be set to 0-5V inputs for the 6 RTD inputs. This
is done with the AQ command with a setting of 3 (AQ n,3 – where n = 0-5).
The calculation for the resistance of the RTD from the analog voltage is given from the following
equation.
R = (1000*V)/21
Where
R = Resistance of RTD
V = Analog Read from RIO
There are 2 methods for calculating the temperature once the resistance of the RTD has been
calculated.
Note:
The following calculations assume an RTD with R
0
= 100 Ω and α = 0.00385 (Platinum RTD).
Method 1
This method strictly uses the RTD coefficient and assumes a proportional relationship between
impedance and temperature. The equation for this is given in the following equation.
Tc = (R – R
0
) / (α * 100)
Where
Tc = Temperature in deg C
R
0
= 100 Ω
α = 0.00385
Below is an example program for using Method 1 that could run on the RIO-4712x or RIO-47142.
#MAIN
REM set Analog inputs 0-5 to 0-5V inputs
AQ 0,3
AQ 1,3
AQ 2,3
A1 – SCB-48206 ▫ 110 RIO-47xxx Rev. 1.0r