JP5907915B2 - Process input / output device with calibration procedure execution function and calibration procedure display function, and calibration test method using the device - Google Patents

Description

  The present invention relates to a process input / output device generally called a PIO (Process Input Output) device connected to a field network in a power plant or the like, and particularly, for example, an analog input unit provided in the process input / output device. The present invention relates to a process input / output device having a calibration procedure execution function and a calibration procedure display function for facilitating a work in a calibration test for measuring an output value from an analog output unit with respect to an input value and a calibration test method using the device Is.

  In the process input / output devices connected to the field network, when starting up a new power plant, etc., for various tests of the analog input / output circuits and digital input / output circuits of the process input / output devices installed in the monitoring control panel A great deal of effort is required. A test for confirming the soundness of an input / output point as an example of a start-up test of the process input / output device, which is provided with a monitoring control unit having a touch panel display device and an input / output circuit unit, A digital control device for inputting a process signal to the monitoring control unit via the unit includes a test device for testing the input / output circuit. The test device includes an input / output point number display selection unit and an input / output circuit soundness determination unit. The input / output point number display means displays an input point or output point number of the input / output circuit unit at a predetermined position on the screen of the touch panel display device, and touches the predetermined position to display a point number. The I / O circuit soundness judgment means selects whether the input of the selected point number is correctly input as a process signal to the monitor control unit or correctly outputs to the output point. Determining whether or not the digital control unit is shown by (for example, Patent Document 1).

Patent Document 1 tests the soundness of a connection circuit between input / output points of a so-called process input / output device. In addition to the process input / output device, for example, a calibration test of an analog output value with respect to an analog input value, Or the calibration test of the digital output value with respect to a digital input value is required, and the description regarding this test is not shown by the said patent document 1. FIG.
In this calibration test, in the case of a configuration similar to that of the digital control device disclosed in Patent Document 1, a technician uses a dedicated test instrument as an analog input terminal of a process input / output device, for example, as a test value for calibration in the test device. A method of repeating the operation of inputting the analog value and storing the value output to the analog output terminal side in the process input / output device is generally performed.

Japanese Patent Publication No. 2008-59101

  However, in the above-described conventional method, generally, a plurality of digital control devices and test devices for installing process input / output devices are installed quite apart like the first floor and the second floor of the building. This is a cause of mistakes, because both of the above-mentioned technicians are required and information transmission between the two is performed via a telephone or the like.

  The present invention has been made in order to solve the above-described problems. The calibration of the process input / output device can be performed by one technician, and the calibration test is facilitated and the cost is reduced. It is an object of the present invention to provide a process input / output device having a procedure execution function and a calibration procedure display function and a calibration test method using the device.

According to a first aspect of the present invention, in the process input / output device with a calibration procedure execution function and a calibration procedure display function, the calibration procedure execution function is provided with a start switch, a mode switch, and a stop switch. The first, second and third indicator lamps, the upper input value indicator lamp, and the lower input value indicator lamp are provided, and when an output value calibration test is performed on the input value of the process input / output device. When the start switch, mode switch, and stop switch are turned on, the first, second, and third indicator lights are turned on, and the value that is higher than the decimal point of the input value is displayed on the upper input value indicator lamp. In addition, the value after the decimal point of the input value is displayed on the lower input value indicator, and the process input / output device stores the upper limit value from the lower limit value of the input value when the mode switch is turned on. It is to create a calibration line of Rutotomoni output value.

  A second invention is a calibration test method for an output value with respect to an input value to a process input / output device by a process input / output device having a calibration procedure execution function and a calibration procedure display function according to the first invention.

  Since the process input / output device with the calibration procedure execution function and the calibration procedure display function according to the first invention adopts the above-described configuration, the process of the calibration test can be visualized and a calibration work error can be visualized. Can be prevented, and the calibration test work can be facilitated, and one technician can be in charge. As a result, the cost can be reduced. The calibration test method according to the second invention has the same effect.

It is a figure which shows the process input / output apparatus with the calibration procedure execution function by Embodiment 1, and a calibration procedure display function. 6 is a diagram showing a calibration line representing an output value with respect to an input value according to Embodiment 1. FIG. It is a figure which shows the process input / output apparatus with the calibration procedure execution function by Embodiment 2, and a calibration procedure display function. It is a figure which shows the process input / output apparatus with the calibration procedure execution function by Embodiment 3, and a calibration procedure display function. It is a figure which shows the process input / output apparatus with the calibration procedure execution function by Embodiment 4, and a calibration procedure display function.

Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a process input / output device 3 (hereinafter referred to as a PIO device) with a calibration procedure execution function and a calibration procedure display function connected to a control device 100 according to the first embodiment via a field network 4. It is. The control device 100 is provided with a calculator 1 and a PIO master 2 that controls the PIO device 3. The field network 4 is a Device Net Foundation Field Bus or the like. A start switch 3a (hereinafter referred to as S / W), a mode switch 3b (mode S / W3b), and a stop switch 3c (stop S / W3c), which are switches for executing a calibration test, have a calibration procedure execution function. LED1, LED2, and LED3, which are first, second, and third indicator lamps that are turned on by these switches, are provided as calibration procedure display functions. When the start S / W 3a is turned on, the LED 1 is turned on. When the mode S / W 3b is turned on, the LED 1 is turned off and the LED 2 is turned on. Further, when the mode S / W 3b is turned on, the LED 2 is turned off and the LED 3 is turned on. The LED 3 is turned off when the stop S / W 3c is input. These start S / W3a, mode S / W3b, stop S / W3c, LED1, LED2, and LED3 are referred to as a calibration procedure execution function and a calibration procedure display function.

Next, the operation will be described. When the calibration test of the input / output circuit (not shown) of the PIO device 3 is started, the LED 1 is turned on when the start S / W 3a is turned on to display the test start. Next, when an input / output circuit (not shown) of the PIO device 3 is configured, for example, when an analog value is input to an analog input terminal and an analog value output to the analog output terminal is measured, a calibration test execution mode S / W3b is input. LED2 is turned on to indicate that the calibration test is being performed.
An example of this calibration test will be described.
Of the input / output circuit terminals of several hundred to several thousand points, the lower limit of the input value to one analog input / output terminal is 4 mA, and the upper limit is 20 mA. Using a constant current power supply device, which is a dedicated device for calibration tests, a lower limit value of 4 mA is input from the outside to the analog input terminal, and the current value detected at the analog output terminal side is measured. For example, the detected value on the analog output terminal side is 4.12 mA. The PIO device 3 stores this input / output value. Next, when the mode S / W 3b is turned on again, the LED 2 is turned off and the LED 3 is turned on to indicate that the upper limit calibration test is being performed. The current value is increased from the outside to the analog input terminal so that the upper limit value is 20 mA, and detection is performed on the input and analog output terminal side, and the value is, for example, 20.6 mA. The PIO device 3 stores these input / output values.
The PIO device 3 calculates a calibration line c shown in FIG. 2 from the stored lower limit value and input / output value of the upper limit value. This calibration line c is obtained by connecting the lower limit value / upper limit output value with respect to the lower limit value / upper limit input value by a straight line, and the PIO device 3 calculates the data on the calibration line c. Since it has a function of calculating an expected output value with respect to the input value, a calibration test operation between the lower limit value 4 mA to be input and the upper limit value 20 mA becomes unnecessary.
When this calibration test is completed, the stop S / W 3c is turned on to turn off the LED 3.
As described above, in the first embodiment, since the PIO device 3 has the calibration procedure execution function and the calibration procedure display function, each step of the calibration test is displayed, and the calibration test is performed in the vicinity of the PIO device 3. The calibration test, which was previously performed by two technicians, can be performed by one technician. Further, since the PIO device 3 has a function of calculating an assumed output value with respect to the input value, the calibration test time can be greatly shortened, and the cost can be reduced.
In the above embodiment, the calibration test of the analog input / output value is described using the analog value. However, the calibration test of the digital input / output value may be performed using the digital value.

Embodiment 2. FIG.
Next, a PIO device with a calibration test execution / display function that enables a highly accurate calibration test according to the second embodiment will be described with reference to FIG.
As shown in FIG. 3, the PIO device 3 according to the second embodiment is obtained by providing the upper value display LED 30 and the lower value display LED 31 in the PIO device 3 shown in FIG. It is the same. The operation of the calibration test of the analog value of 4 mA to 20 mA that is the same as that of the first embodiment will be described. When the start S / W 3a is turned on, the LED 1 is turned on to display the start of the calibration test. Next, when mode S / W3b is turned on, LED2 is turned on. When 4.1 mA is first input to the analog input terminal from the outside, the six upper input value display LEDs 30 are turned on, and the six lower input value display LEDs 31 are turned on. In other words, since the upper input value display LED 30 lights up the value above the decimal point and the lower input value display LED 31 lights up the value below the decimal point (lighting 2 to 0 × F), the input value at the current time point is known. The PIO device 3 stores a detected value on the analog output terminal side with respect to this input value, for example, 4.223 mA. Next, when the mode switch 3b is turned on again to prompt input of 20 mA, the LED 3 is turned on. When 16.2 mA (0 × 10.2 mA) is input to the analog input terminal from the outside, the upper input value display LED 30 becomes OOOOXX and the lower input value display LED 31 becomes OOOOOO. The PIO device 3 stores the detected value on the analog output terminal side at this time, for example, 20.6 mA, and calculates a calibration line c equivalent to that shown in FIG. 2 of the first embodiment from these stored values. However, the second embodiment has a function suitable for high-precision calibration as compared with the first embodiment described above, and the input current described above is 4 to 4 mA of the first embodiment. .1 mA and smaller. When the calibration test is completed, the stop S / W 3 is turned on, and the LED 3, the upper input value display LED 30, and the lower input value display LED 31 are turned off.
As described above, in the second embodiment, in addition to the effects of the first embodiment, the input value is displayed. Therefore, even if an erroneous input occurs in the calibration test, it can be easily detected and highly accurate. There is an effect that calibration is possible.

Embodiment 3 FIG.
Next, Embodiment 3 will be described with reference to FIG. As shown in FIG. 4, the PIO device 3 with the calibration procedure execution function and the calibration procedure display function according to the third embodiment replaces the three LEDs 1 to LED3 of the first embodiment described above with one LED 10. Further, one selection S / W3d is provided instead of the start S / W3a, the mode S / W3b, and the stop S / W3c.
This selection S / W3d has different ON and OFF functions by selecting the length of the pressing time when the switch is turned on. For example, when the pressing time is ON and OFF within 2 seconds, the start exemplified in the first embodiment An operation equivalent to the functions of S / W3a and stop S / W3c is performed. When the button is kept pressed for 5 seconds or more, the same calibration as that in the case of the mode S / W3b illustrated in the first embodiment is performed. That is, the calibration test is started when the selected S / W 3d is turned on, the LED 10 is turned on, the LED 10 is blinked when the mode function of the selected S / Wd is selected, and the LED 10 is turned off when the stop selection is selected. The period in which the LED 10 blinks by selecting the mode function may be different from the case where the lower limit value is input and the case where the upper limit value is input. That is, the blinking cycle is changed such that the lower limit is 1 time / 2 seconds, and the upper limit is 3 times / 2 seconds. Since the other calibration test operations are the same as those in the first embodiment, the description thereof will be omitted. The PIO device 3 with the calibration procedure execution function and the calibration procedure display function according to the third embodiment having such a configuration has one S / W and one LED, thereby reducing costs and downsizing the device. Played with the added effect.

Embodiment 4 FIG.
Next, a fourth embodiment will be described with reference to FIG. As shown in FIG. 5, the PIO device 3 with the calibration procedure execution function and the calibration procedure display function of the fourth embodiment includes an input terminal 21 constituting an input / output circuit not shown in FIG. 1 of the first embodiment. The output terminal 22 is shown in FIG. 5 and a loopback means 40 is provided between the input terminal 21 and the output terminal 22, and the rest is the same as FIG. 1. As described above, in the fourth embodiment, since the PIO device 3 with the calibration procedure execution function and the calibration procedure display function provided with the loopback means 40 is used, the value input from the input terminal 21 is output correctly at the output terminal 22. It becomes possible to confirm. Since other operations are the same as those in the first embodiment, description thereof is omitted. In place of the loopback means 40, a personal computer may be connected to the output terminal 22 and an output value may be displayed on the personal computer.
As described above, in the fourth embodiment, in addition to the effects of the first embodiment, there is an effect that it can be easily confirmed whether or not a correct input has been made.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

3 PIO device, 3a start S / W, 3b mode S / W,
3c stop S / W, 3d selection S / W, 4 field network,
10 LED, 11 LED1, 12 LED2, 13 LED3, 21 Input terminal,
22 output terminals, 30 upper input value display LEDs, 31 lower input value display LEDs,
40 Loopback means, C calibration line.

Claims (2)

In the process input / output apparatus with a calibration procedure execution function and a calibration procedure display function, the calibration procedure execution function is provided with a start switch, a mode switch, and a stop switch, and the calibration procedure display function includes first and second switches. A third indicator lamp, a higher-order input value indicator lamp, and a lower-order input value indicator lamp, and the start is performed when an output value calibration test is performed on the input value of the process input / output device. When the switch, mode switch, and stop switch are turned on, the first, second, and third indicator lights are turned on, and the value that is greater than the decimal point of the input value is displayed on the upper input value indicator lamp. Rutotomoni, the decimal value of the input value is displayed in the input value indicator of the lower, said process input and output device when said mode switch is turned on, Fill force value calibration procedure performed functions and processes input and output device with a calibration procedure display function, characterized in that to create a calibration line of the output value stores the upper limit value from the lower limit value of. The calibration test method of the output value with respect to the input value to the process input / output device by the process input / output device with the calibration procedure execution function and the calibration procedure display function according to claim 1 .

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