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Micromod MOD: 30ML Functions Data Base Reference User Manual

Page 81

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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

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