Transmitter and a method for duplicating same
First Claim
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1. A transmitter for receiving an input of a process variable and converting said process variable into a predetermined output signal by executing a plurality of calculation steps, comprising:
- a backward calculation means for executing backward calculation of each ordinary calculation step based on the variable calculated at each of said plurality of steps, in addition to a forward calculation means for executing calculation of said plurality of steps;
said output signal is given in digital value by a sensor;
said sensor is a vibrating differential pressure or a pressure sensor;
said backward calculation steps having the following steps;
for each step of said plurality of steps, using correction factor ci, scaled differential pressure dpscaled, and calculated value output pwm calculated by said forward calculation means, calculating scaled differential pressure dpscaled′
using Equation (1) below,for each step of said plurality of steps, using differential pressure dpcomp that has been corrected in temperature and static pressure and ranges urv and lrv, and said scaled differential pressure dpscaled which has been calculated by said forward calculating means, calculating differential pressure dpcomp′
, which has been corrected in temperature and static pressure, using Equation (2) below,for each step of said plurality of steps, using correction factor ki, differential pressure signal X, and said differential pressure dpcomp which has been corrected in temperature and static pressure calculated by said forward calculating means, calculating differential pressure signal X′
, using Equation (3) below,for each step of said plurality of steps, using sensor frequencies fc, fr, constants A, B and C, and said differential pressure signal X calculated by said forward calculating means, calculating sensor frequency fc′
using Equation (4) below,
dpcomp′
=dpscaled(urv−
lrv)+lrv
Equation 2
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Abstract
The present invention is intended to realize a transmitter whose internal signal processing function can be duplicated without having to add any hardware components. The transmitter converts an input signal into an output signal using a plurality of calculation steps, comprising a backward calculation means for executing the plurality of calculation steps in reverse direction.
9 Citations
11 Claims
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1. A transmitter for receiving an input of a process variable and converting said process variable into a predetermined output signal by executing a plurality of calculation steps, comprising:
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a backward calculation means for executing backward calculation of each ordinary calculation step based on the variable calculated at each of said plurality of steps, in addition to a forward calculation means for executing calculation of said plurality of steps; said output signal is given in digital value by a sensor; said sensor is a vibrating differential pressure or a pressure sensor; said backward calculation steps having the following steps; for each step of said plurality of steps, using correction factor ci, scaled differential pressure dpscaled, and calculated value output pwm calculated by said forward calculation means, calculating scaled differential pressure dpscaled′
using Equation (1) below,for each step of said plurality of steps, using differential pressure dpcomp that has been corrected in temperature and static pressure and ranges urv and lrv, and said scaled differential pressure dpscaled which has been calculated by said forward calculating means, calculating differential pressure dpcomp′
, which has been corrected in temperature and static pressure, using Equation (2) below,for each step of said plurality of steps, using correction factor ki, differential pressure signal X, and said differential pressure dpcomp which has been corrected in temperature and static pressure calculated by said forward calculating means, calculating differential pressure signal X′
, using Equation (3) below,for each step of said plurality of steps, using sensor frequencies fc, fr, constants A, B and C, and said differential pressure signal X calculated by said forward calculating means, calculating sensor frequency fc′
using Equation (4) below,
dpcomp′
=dpscaled(urv−
lrv)+lrv
Equation 2 - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for duplicating a transmitter, having the following characteristics:
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a forward calculation step to convert an input signal into an output signal using plurality of calculation steps; a backward calculation step in order to calculate a backward calculation of each ordinary calculation step, the value of which has been calculated in each of said plurality of steps; and a verification step in order to execute the judgment of agreement between values calculated in said forward calculation steps and values calculated in the corresponding steps of said backward calculation steps; said input signal is given in digital value by sensor; said sensor is a vibrating differential pressure or pressure sensor, said backward calculation steps having the following steps; for each step of said plurality of steps, using correction factor ci, scaled differential pressure dpscaled, and calculated value output pwm calculated by said forward calculation steps, calculating scaled differential pressure dpscaled′
using Equation (5) below,for each of said plurality of steps, using differential pressure dpcomp that has been amended in temperature and static pressure and ranges urv and lrv, and said scaled differential pressure dpscaled which has been calculated by said forward calculating means, calculating differential pressure dpcomp′
, which has been corrected in temperature and static pressure, using Equation (6) below;for each of said plurality of steps, using correction factor ki, differential pressure signal X, and said differential pressure dpcomp which has been corrected in temperature and static pressure calculated by said forward calculating step, calculating differential pressure signal X′
, using Equation (7) below,for each of said plurality of steps, using sensor frequencies fc, fr, constants A, B and C, and said differential pressure signal X′
calculated by said forward calculating step, calculating sensor frequency fc′
using Equation (8) below,
dpcomp′
=dpscaled(urv−
lrv)+lrv
Equation 6 - View Dependent Claims (9, 10, 11)
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Specification