Micromod MOD: 30ML Functions Data Base Reference - Manual (Page 81)

MOD 30ML Functions
BUILT-IN ANALOG INPUT BLOCK
50 Resistance Range (RANGE)............................................................................................ C – R
Applies only to RTD and RESISTANCE input types.
LOW 0 0 to 55 ohms
NORMAL 1 0 to 430 ohms
51 Burnout Detection (BURNDIR)........................................................................................ C – R
Applies only to THERMOCOUPLE or TC+CJC input types, and MILLIVOLT input types when
these signals represent a thermocouple input.
NONE 0 No burnout detection
UPSCALE 1 Signal moves upscale if burnout is detected
DOWNSCALE 2 Signal moves downscale if burnout is detected
52,54... 58 B0 Input (B0) through B3 Input (B3)................................................................................ – – R
Raw voltage input values in counts as read from the input circuit. These values are used in
the calculation of the field Result as shown in Table 2-10.
53,55... 59 B0 Input Quality (B0Q) through B3 Input Quality (B3Q), ............................................. – – R
The quality of an input is set BAD under the following conditions:
• Value is not read due to a communications error.
• Status value read deems the input as BAD.
• Input was never read; not used
Table 2-10. Equations for Calculation of Field Result Values Using Inputs B0, B1, B2 and B3
Input Type Field Result (FR) Equals Units
VOLTAGE VRHI*(B3-B0-ZHI)/(B2-B0-ZHI) VOLTS
CURRENT (VRHI*(B1-B0-ZHI))/(RIN*(B2-B0-ZHI)) AMPS
MILLIVOLT VRLO*(B3-B0-ZLO)/(B2-B0-ZLO) mVOLTS
TC (VRLO*(B3-B0-ZLO)/(B2-B0-ZLO))*1000 uVOLTS
TC (VRLO*(B3-B0-ZLO)/(B2-B0-ZLO))*1000 uVOLTS
+CJC CJTC*((VRLO*(B1-B0-ZLO)/(B2-B0-ZLO))-CJV0) degrees
C
RTD (RIN*(B2-(2*B3)+B1)/(B1-B0-ZLO))-RZE OHMS
RES (RIN*(B2-(2*B3)+B1)/(B1-B0-ZLO))-RZE OHMS
2-73