CN104199309A - Analog channel calibrating method of simulating and testing instrument of hydro turbine governor - Google Patents

Analog channel calibrating method of simulating and testing instrument of hydro turbine governor Download PDF

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CN104199309A
CN104199309A CN201410445151.8A CN201410445151A CN104199309A CN 104199309 A CN104199309 A CN 104199309A CN 201410445151 A CN201410445151 A CN 201410445151A CN 104199309 A CN104199309 A CN 104199309A
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simulating
hydrogovernor
testing instrument
voltage
value
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CN104199309B (en
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孙谋
杨峰
刘荆飞
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THREE GORGES NENGSHIDA ELECTRIC CO Ltd
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THREE GORGES NENGSHIDA ELECTRIC CO Ltd
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Abstract

The invention provides an analog channel calibrating method of a simulating and testing instrument of a hydro turbine governor. The method comprises the following steps: calibrating output and input of an analog signal; abstracting the relation between a target value and an actual value into a linear relation; setting x as the target value, y as the actual value, analogizing the relation between the target value and the actual value through a linear equation of y=ax+b, wherein parameter a represents the slope of the linear equation, and the parameter b represents the intercept of the linear equation; calculating the parameters a and b by the least square method and the general linear fitting formula; operating a PC to control the simulating and testing instrument of hydro turbine governor to output target values x of multi-point analog signals at intervals; measuring the actual value y of the analog signal of the simulating and testing instrument through a multimeter; transmitting the actual value y to the PC; calculating the parameters a and b through the PC; then transmitting to the simulating and testing instrument. According to the method, the national third-party detection agency performs detection, and therefore, the accuracy of analog input and output channels can completely meet the industrial standard; all the process of the method are automatically carried out, thus the error caused by manual measurement can be reduced, and the calibration efficiency is raised.

Description

Hydrogovernor simulating and testing instrument analog channel calibration steps
Technical field
The present invention relates to hydrogovernor emulation testing field, particularly a kind of calibration steps for hydrogovernor simulating and testing instrument analog channel.
Background technology
Hydrogovernor simulating and testing instrument is a kind of comprehensive platform for Turbine Governor System dynamic simulation, performance test and fault diagnosis.This simulating and testing instrument gathers outside several groups of 0～20ma and 0～10v simulating signal, by Nonlinear Modeling and dynamic simulation algorithm, export 0 adjustable～20ma of corresponding several groups of numerical controls and 0～10v simulating signal, realize dynamic simulation, performance test and the fault diagnosis of Turbine Governor System.So the collection of 0～20ma and 0～10v simulating signal and output accuracy will have a strong impact on the precision of hydrogovernor simulating and testing instrument.Hydrogovernor simulating and testing instrument is applied on powerful device, all passages must add electrical isolation, the non-linear simulating signal that causes the output of hydrogovernor simulating and testing instrument and gather of non-linear and other electron device of electrical isolation device is all nonlinear, and this all has a strong impact on the performance of hydrogovernor simulating and testing instrument.
Summary of the invention
The simulating signal that the present invention is directed to hydrogovernor simulating and testing instrument output and gather non-linear, provide one simply, reliably, efficiently, bearing calibration accurately, object is to improve simulation performance and the precision of hydrogovernor simulating and testing instrument.
The concrete technical scheme of the present invention is as follows.
1, the output of simulating signal calibration
By PC control hydrogovernor simulating and testing instrument interval output multiple-point simulation signal target value x, then measure the simulating signal actual value y of hydrogovernor simulating and testing instrument output with the High Precision Multimeter with communication function, the simulating signal actual value y again multimeter being measured is sent to PC by PORT COM, and PC receives desired value and the actual value of simulating signal;
By abstract the relation between desired value and actual value be linear relationship, establishing x is desired value, y is actual value, by the relation between straight-line equation y=ax+b simulated target value and actual value, the slope that wherein parameter a is straight-line equation, the intercept that parameter b is straight-line equation.
Adopt following least square method general linear fitting formula (1-1), (1-2) to calculate parameter a, b,
a = n Σ k = 0 n - 1 x k y k - Σ k = 0 n - 1 x k Σ k = 0 n - 1 y k n Σ k = 0 n - 1 X k 2 - Σ k = 0 n - 1 x k Σ k = 0 n - 1 x k - - - ( 1 - 1 )
b = Σ k = 0 n - 1 y k - a Σ k = 0 n - 1 x k n - - - ( 1 - 2 )
In formula, n is the sampling logarithm of desired value and actual value, x k, y k(k=0,1,2 ... n) be respectively desired value point and actual value point, after calculating, parameters obtained a, b are calibration parameter;
Then calibration parameter is sent to hydrogovernor simulating and testing instrument.
2, the input of simulating signal calibration
The simulating signal of hydrogovernor simulating and testing instrument output is directly outputed to hydrogovernor simulating and testing instrument analog acquisition input end, by PC control hydrogovernor simulating and testing instrument interval output multiple-point simulation signal, the simulating signal actual value y that hydrogovernor simulating and testing instrument collects analog channel sends to PC; The simulating signal of hydrogovernor simulating and testing instrument output is directly received on multimeter, PC control hydrogovernor simulating and testing instrument is exported the multiple-point simulation signal at same interval, multimeter is delivered to PC the signal target value x measuring again, PC calculates calibration parameter according to fitting formula (1-1), (1-2), finally calibration parameter is sent to hydrogovernor simulating and testing instrument.
The hydrogovernor simulating and testing instrument of calibrating by the method for the invention, detects through national third party testing agency, and the degree of accuracy of analog input and output channel can reach industry standard completely; Meanwhile, the method all processes completes automatically, has reduced the error that artificial measurement causes, has improved the efficiency of calibration.
Brief description of the drawings
Fig. 1 is principle of the invention block diagram.
In figure: 1---PC, 2---multimeter, 3---hydrogovernor simulating and testing instrument, 11---the first connection, it is the connection between PC and hydrogovernor simulating and testing instrument, 12---the second connection, i.e. connection between PC and multimeter, 13---multimeter test test pencil.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing of the present invention, technical scheme of the present invention is carried out to clear, complete description.As shown in Figure 1, described hydrogovernor simulating and testing instrument analog channel calibration steps, the method has mainly been used PC 1, multimeter 2, hydrogovernor simulating and testing instrument 3, and multimeter 2 is connected with PC 1 with 11 with connection 12 respectively with hydrogovernor simulating and testing instrument 3.
One, physical simulation channel calibration method comprises the following steps;
1, analog voltage output calibration
PC 1 sends instruction by the first connection 11, makes the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument 3 from 0V, and with step-length 0.2V, time interval 3S, increases continuously, until output 10V stops.These instructions are the desired value x of output voltage.In the middle of the process increasing continuously in the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument 3, the test test pencil 13 of multimeter 2 is parallel to Voltage-output port simultaneously, to measure the corresponding actual measured value y of the each instruction of Voltage-output port, and PC 1 reads each actual measured value in time by the second connection 12.
PC, the desired value and the actual measured value that obtain voltage signal, calculates calibration parameter by formula 1-1,1-2, finally calibration parameter is sent to hydrogovernor simulating and testing instrument 3.
2, analog current output calibration
PC 1 sends instruction by the first connection 11, makes the current output terminal electric current of hydrogovernor simulating and testing instrument 3 from 0ma, and with step-length 0.4ma, time interval 3S, increases continuously, until output 20ma stops.These instructions are the desired value x of output current.In the middle of the process increasing at the current output terminal current continuity of hydrogovernor simulating and testing instrument 3, the test test pencil 13 of multimeter 2 is connected in series to current output terminal mouth simultaneously, to measure the corresponding actual measured value y of the each instruction of current output terminal mouth, and PC 1 reads each actual measured value in time by the second connection 12.
PC, the desired value and the actual measured value that obtain current signal, calculates calibration parameter by formula 1-1,1-2 like this, finally calibration parameter is sent to hydrogovernor simulating and testing instrument 3.
3, analog voltage input calibration
First the voltage input end mouth on hydrogovernor simulating and testing instrument 3 and Voltage-output port are together in parallel by positive and negative with shorting stub, simultaneously on the test test pencil 13 of multimeter 2 also parallel connection, PC 1 sends instruction by the first connection 11, make the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument 3 from 0V, with step-length 0.2V, time interval 3S, increases continuously, until output 10V stops.In the middle of the process increasing continuously in the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument 3, multimeter 2 can be measured the corresponding voltage output end mouth of each instruction virtual voltage, the actual voltage value of Voltage-output port is the desired value x of voltage input end mouth, in time each virtual voltage measured value is read by the second connection 12 by PC 1.Because being uses Voltage-output port to proofread and correct input port herein, so the actual value of Voltage-output port is now the desired value x of voltage input end mouth.It is actual value y that the voltage input end of while hydrogovernor simulating and testing instrument 3 can measure the corresponding actual measured value of each instruction, and passes to PC 1 by the first connection 11.
PC, the desired value x and the actual measured value y that obtain voltage signal, calculates calibration parameter by formula 1-1,1-2 like this, finally calibration parameter is sent to hydrogovernor simulating and testing instrument 3.
4, analog current input calibration
First the current input terminal mouth on hydrogovernor simulating and testing instrument 3 and current output terminal mouth are got up by positive-negative series with shorting stub, PC 1 sends instruction by the first connection 11, make the current output terminal electric current of hydrogovernor simulating and testing instrument 3 from 0ma, with step-length 0.4ma, time interval 3S, increase continuously, until output 20ma stops.In the middle of the process increasing at the current output terminal current continuity of hydrogovernor simulating and testing instrument 3, it is actual value y that the current input terminal of hydrogovernor simulating and testing instrument 3 can measure the corresponding actual measured value of each instruction, and passes to PC 1 by the first connection 11.
After the actual value y that PC 1 obtains measuring, pull out the shorting stub that current input terminal mouth on hydrogovernor simulating and testing instrument 3 and current output terminal mouth get up by positive-negative series.The test test pencil 13 of multimeter 2 is connected in series on the current output terminal mouth of hydrogovernor simulating and testing instrument 3, at this moment PC 1 sends instruction by the first connection 11 again, make the current output terminal electric current of hydrogovernor simulating and testing instrument 3 from 0ma, with step-length 0.4ma, time interval 3S, increase continuously, until output 20ma stops.Multimeter 2 is measured the corresponding actual measured value of the each instruction of current output terminal mouth, and PC 1 reads each actual measured value in time by the second connection 12.These values are the target current value x of analog current input calibration.It should be explained that: since PC 1 can be by with step-length 0.4ma herein, time interval 3S, increase continuously the electric current output of hydrogovernor simulating and testing instrument 3, be not exactly target current value as long as record so this set-point, what is the need for and survey with multimeter 2? reason is, 1, the measuring accuracy of multimeter is higher than the electric current output accuracy of hydrogovernor simulating and testing instrument 3; If 2, the current output terminal mouth of hydrogovernor simulating and testing instrument 3 does not have calibrated, between the instruction of sending with actual PC, there is error, for example PC output order is output 3ma, result actual measured value is but 3.2ma, so the value of measuring using multimeter participates in computing as desired value, the correction result obtaining just can be relatively good.
PC, the desired value x and the actual measured value y that obtain current signal, calculates calibration parameter by formula 1-1,1-2 like this, finally calibration parameter is sent to hydrogovernor simulating and testing instrument 3.
5, repeat 4 other passages of step calibration hydrogovernor simulating and testing instrument above.
6, so far hydrogovernor simulating and testing instrument analog channel calibration is complete.
By an actual embodiment who proofreaies and correct the 3 analog voltage outputs of hydrogovernor simulating and testing instrument, input, embodiments of the present invention are described in further detail below.
1, analog voltage output calibration
Described in physical simulation channel calibration method, PC 1 sends instruction by the first connection 11, makes the voltage output end output relevant voltage of hydrogovernor simulating and testing instrument 3.Instruction is the desired value x of output voltage, arranges out desired value x as shown in Table 1.
Table one, analog voltage export target value x
In the time that the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument 3 is exported according to PC 1 instruction, the test test pencil 13 of multimeter 2 is parallel to Voltage-output port, to measure the corresponding actual measured value y of the each instruction of Voltage-output port, as shown in Table 2.
Table two, analog voltage output actual value y
k y k y k y k y k y
0 0.023 10 2.020 20 4.025 30 6.025 40 8.030
1 0.217 11 2.220 21 4.226 31 6.225 41 8.230
2 0.416 12 2.422 22 4.426 32 6.426 42 8.431
3 0.616 13 2.623 23 4.626 33 6.626 43 8.632
4 0.815 14 2.823 24 4.827 34 6.826 44 8.833
5 1.017 15 3.024 25 5.022 35 7.027 45 9.033
6 1.219 16 3.224 26 5.223 36 7.228 46 9.234
7 1.420 17 3.424 27 5.423 37 7.428 47 9.435
8 1.620 18 3.624 28 5.624 38 7.629 48 9.636
9 1.821 19 3.825 29 5.824 39 7.829 49 9.832
Had the sampling logarithm of 50 pairs of desired values and actual value by table one and table two known, i.e. n=50.Data substitution formula 1-1, the 1-2 of table one, table two, can calculate the slope a=0.9984 of straight line, intercept b=-0.0171, then calibration parameter a, b sends to hydrogovernor simulating and testing instrument 3, and hydrogovernor simulating and testing instrument 3 can carry out linear output voltage according to new straight slope a and intercept b automatically.
Hydrogovernor simulating and testing instrument 3 adopts after new straight slope a and intercept b, remeasures analog voltage output actual value y according to method above, can obtain table three, as shown in following table three.
Simulation Voltage-output actual value y after table three, correction
k y k y k y k y k y
0 0.003 10 2.002 20 4.002 30 5.998 40 7.997
1 0.205 11 2.199 21 4.205 31 6.197 41 8.196
2 0.401 12 2.400 22 4.405 32 6.399 42 8.398
3 0.607 13 2.598 23 4.603 33 6.600 43 8.599
4 0.804 14 2.797 24 4.798 34 6.802 44 8.798
5 1.006 15 2.999 25 4.999 35 7.001 45 9.001
6 1.203 16 3.201 26 5.198 36 7.202 46 9.202
7 1.400 17 3.402 27 5.396 37 7.402 47 9.405
8 1.601 18 3.601 28 5.598 38 7.604 48 9.602
9 1.802 19 3.804 29 5.795 39 7.801 49 9.807
Analytical table two and table three, maximum error between analog voltage export target value x in analog voltage output actual value y and table one in table two has 0.036V, and the maximum error between the analog voltage export target value x in the output actual value y of the analog voltage in table three and table one only has 0.005V after calibration, this meets the accuracy requirement of hydrogovernor simulating and testing instrument 3 errors lower than ± 0.01V completely.
2, analog voltage input calibration
Described in physical simulation channel calibration method, voltage input end mouth on hydrogovernor simulating and testing instrument 3 and Voltage-output port are together in parallel by positive and negative with shorting stub, PC 1 sends instruction by connection 11, makes the voltage output end output relevant voltage of hydrogovernor simulating and testing instrument 3.Multimeter 2 can be measured the desired value x of voltage input end mouth, as shown in Table 4.
Table four, analog sampling voltage input desired value x
In the time of the desired value of multimeter 2 measuring voltage input ports, the voltage input end of hydrogovernor simulating and testing instrument 3 can measure the corresponding actual measured value of each desired value and be actual value y simultaneously, as shown in table 5.
Table five, analog sampling voltage actual measured value y
k y k y k y k y k y
0 0.039 10 2.038 20 4.038 30 6.033 40 8.033
1 0.235 11 2.238 21 4.238 31 6.232 41 8.232
2 0.434 12 2.438 22 4.437 32 6.433 42 8.435
3 0.636 13 2.638 23 4.637 33 6.631 43 8.636
4 0.837 14 2.839 24 4.837 34 6.832 44 8.834
5 1.037 15 3.038 25 5.032 35 7.034 45 9.036
6 1.236 16 3.237 26 5.232 36 7.232 46 9.237
7 1.437 17 3.437 27 5.433 37 7.432 47 9.437
8 1.638 18 3.638 28 5.632 38 7.633 48 9.634
9 1.838 19 3.837 29 5.832 39 7.833 49 9.831
Had the sampling logarithm of 50 pairs of desired values and actual value by table four and table five known, i.e. n=50.Data substitution formula 1-1, the 1-2 of table four, table five, can calculate the slope a=1.0003 of straight line, intercept b=-0.0356, then calibration parameter a, b sends to hydrogovernor simulating and testing instrument 3, and hydrogovernor simulating and testing instrument 3 can carry out linear calculating input voltage according to new straight slope a and intercept b automatically.
Hydrogovernor simulating and testing instrument 3 adopts after new straight slope a and intercept b, remeasures analog voltage input actual value according to method above, can obtain table six, as follows.
Simulation sampled voltage actual measured value y after table six, calibration
Analytical table five and table six, in table five, in analog sampling voltage actual measured value y and table four, the maximum error between analog sampling voltage input desired value x has 0.016V, and the maximum error that in analog sampling voltage actual measured value y and table four, analog sampling voltage is inputted between desired value x in table six after calibration only has 0.004V, this meets the accuracy requirement of hydrogovernor simulating and testing instrument 3 errors lower than ± 0.01V completely.
Communication between PC 1 and hydrogovernor simulating and testing instrument 3 adopts ethernet communication agreement.Multimeter 2 is with serial communication function, its voltage at 0～10V, electric current in 0～20ma interval, measuring accuracy voltage error lower than ± 0.01V, current error lower than ± 0.02ma, and the Measurement sensibility time be less than 3S.PC is not only with network interface communication function but also with serial communication function.

Claims (3)

1. a hydrogovernor simulating and testing instrument analog channel calibration steps, PC (1) is connected with hydrogovernor simulating and testing instrument (3) by the first connection (11), be connected with multimeter (2) by the second connection (12), multimeter (2) gathers hydrogovernor simulating and testing instrument (3) electric current by its test test pencil (13), the electric current of Voltage-output port output, voltage, PC (1) is exported corresponding voltage and current by Voltage-output port and the current output terminal mouth of instruction control hydrogovernor simulating and testing instrument (3), and read in real time by the second connection (12) value that multimeter (2) measures, it is characterized in that:
A. the output of simulating signal calibration: by PC control hydrogovernor simulating and testing instrument interval output multiple-point simulation signal target value x, then measure the simulating signal actual value y of hydrogovernor simulating and testing instrument output with the High Precision Multimeter with communication function, the simulating signal actual value y again multimeter being measured is sent to PC by PORT COM, and PC receives desired value and the actual value of simulating signal;
By abstract the relation between desired value and actual value be linear relationship, establishing x is desired value, y is actual value, by the relation between straight-line equation y=ax+b simulated target value and actual value, the slope that wherein parameter a is straight-line equation, the intercept that parameter b is straight-line equation;
Adopt following least square method general linear fitting formula (1-1), (1-2) to calculate parameter a, b,
a = n Σ k = 0 n - 1 x k y k - Σ k = 0 n - 1 x k Σ k = 0 n - 1 y k n Σ k = 0 n - 1 X k 2 - Σ k = 0 n - 1 x k Σ k = 0 n - 1 x k - - - ( 1 - 1 )
b = Σ k = 0 n - 1 y k - a Σ k = 0 n - 1 x k n - - - ( 1 - 2 )
In formula, n is the sampling logarithm of desired value and actual value, x k, y k(k=0,1,2 ... n) be respectively desired value point and actual value point, after calculating, parameters obtained a, b are calibration parameter;
Then calibration parameter is sent to hydrogovernor simulating and testing instrument;
B. the input of simulating signal calibration: the simulating signal of hydrogovernor simulating and testing instrument output is directly outputed to hydrogovernor simulating and testing instrument analog acquisition input end, by PC control hydrogovernor simulating and testing instrument interval output multiple-point simulation signal, the simulating signal actual value y that hydrogovernor simulating and testing instrument collects analog channel sends to PC; The simulating signal of hydrogovernor simulating and testing instrument output is directly received on multimeter, PC control hydrogovernor simulating and testing instrument is exported the multiple-point simulation signal at same interval, multimeter is delivered to PC the signal target value x measuring again, PC calculates calibration parameter according to fitting formula (1-1), (1-2), finally calibration parameter is sent to hydrogovernor simulating and testing instrument.
2. hydrogovernor simulating and testing instrument analog channel calibration steps according to claim 1, is characterized in that, the output calibration of described step a simulating signal comprises the following steps:
A1. analog voltage output calibration: PC (1) sends instruction by the first connection (11), make the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument (3) from 0V, with step-length 0.2V, time interval 3S, increase continuously, until output 10V stops, these instructions are the desired value x of output voltage, in the middle of the process increasing continuously in the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument (3), the test test pencil (13) of multimeter (2) is parallel to Voltage-output port simultaneously, to measure the corresponding actual measured value y of the each instruction of Voltage-output port, and PC (1) reads each actual measured value in time by the second connection (12), PC is the desired value and the actual measured value that obtain voltage signal, by formula 1-1, 1-2 calculates calibration parameter, finally calibration parameter is sent to hydrogovernor simulating and testing instrument (3),
A2. analog current output calibration: PC (1) sends instruction by the first connection (11), make the current output terminal electric current of hydrogovernor simulating and testing instrument (3) from 0ma, with step-length 0.4ma, time interval 3S, increase continuously, until output 20ma stops.These instructions are the desired value x of output current.In the middle of the process increasing at the current output terminal current continuity of hydrogovernor simulating and testing instrument (3), the test test pencil (13) of multimeter (2) is connected in series to current output terminal mouth simultaneously, to measure the corresponding actual measured value y of the each instruction of current output terminal mouth, and PC (1) reads each actual measured value in time by the second connection 12.PC, the desired value and the actual measured value that obtain current signal, calculates calibration parameter by formula 1-1,1-2 like this, finally calibration parameter is sent to hydrogovernor simulating and testing instrument (3).
3. hydrogovernor simulating and testing instrument analog channel calibration steps according to claim 1, is characterized in that, the input calibration of described step b simulating signal comprises the following steps:
B1. analog voltage input calibration: first the voltage input end mouth on hydrogovernor simulating and testing instrument (3) and Voltage-output port are together in parallel by positive and negative with shorting stub, simultaneously on the test test pencil (13) of multimeter (2) also parallel connection, PC (1) sends instruction by the first connection (11), make the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument (3) from 0V, with step-length 0.2V, time interval 3S, increase continuously, until output 10V stops.In the middle of the process increasing continuously in the Voltage-output terminal voltage of hydrogovernor simulating and testing instrument (3), multimeter (2) can be measured the corresponding voltage output end mouth of each instruction virtual voltage, the actual voltage value of Voltage-output port is the desired value x of voltage input end mouth, in time each virtual voltage measured value is read by the second connection (12) by PC (1), it is actual value y that the voltage input end of while hydrogovernor simulating and testing instrument (3) measures the corresponding actual measured value of each instruction, and pass to PC (1) by the first connection (11), PC, the desired value x and the actual measured value y that obtain voltage signal, calculates calibration parameter by formula 1-1,1-2, finally calibration parameter is sent to hydrogovernor simulating and testing instrument 3,
B2. analog current input calibration: first the current input terminal mouth on hydrogovernor simulating and testing instrument (3) and current output terminal mouth are got up by positive-negative series with shorting stub, PC (1) sends instruction by the first connection (11), make the current output terminal electric current of hydrogovernor simulating and testing instrument (3) from 0ma, with step-length 0.4ma, time interval 3S, increase continuously, until output 20ma stops, in the middle of the process increasing at the current output terminal current continuity of hydrogovernor simulating and testing instrument (3), it is actual value y that the current input terminal of hydrogovernor simulating and testing instrument (3) can measure the corresponding actual measured value of each instruction, and pass to PC (1) by the first connection (11), after the actual value y that PC obtains measuring, pull out the shorting stub that current input terminal mouth on hydrogovernor simulating and testing instrument (3) and current output terminal mouth get up by positive-negative series.The test test pencil (13) of multimeter (2) is connected in series on the current output terminal mouth of hydrogovernor simulating and testing instrument 3, at this moment PC (1) sends instruction by the first connection (11) again, make the current output terminal electric current of hydrogovernor simulating and testing instrument (3) from 0ma, with step-length 0.4ma, time interval 3S, increase continuously, until output 20ma stops, multimeter (2) is measured the corresponding actual measured value of the each instruction of current output terminal mouth, PC (1) reads this actual measured value in real time by the second connection (12).
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