JPS6271817A - Transducer - Google Patents

Abstract

PURPOSE:To accept only values within an input range by setting the upper and lower limit values of an input signal in a storage means previously and making a request for re-setting when the input signal exceeds the input range during the setting of the upper and lower values. CONSTITUTION:When a push button switch PB5 is pressed, respective flags of flag registers PV, H, and L are updated so as to set successively. When the H flag is set, H is displayed on a panel surface and an upper limit value setting routine is entered; and numerals of respective digits of a display device 6 are set with push button switches PB1-PB4 for numeral setting and the upper limit value is stored in an H set value register. When the L flag is set as a result of the update of the flag registers, L is displayed on the panel surface and a lower limit value is inputted as well as the input of the upper limit value and stored in an L set value register. Therefore, when a numeral which is not within the range is inputted in the upper and lower limit value setting routines, an operator is requested to re-set a numeral and a wrong upper or lower limit value is prevented from being set.

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to a transducer that converts physical quantities such as current, voltage, temperature, and pressure into linearized output within a predetermined range, and particularly relates to a transducer that converts physical quantities such as current, voltage, temperature, and pressure into linearized output within a predetermined range. The present invention relates to a transducer having characteristics in its settings.

[Summary of the invention]

The transducer according to the invention can be used for both current and voltage.

Input signals in a predetermined range of physical quantities such as temperature and pressure are converted into signals at a predetermined level, and the upper and lower limits of the input signal are set in advance in the storage means, so that when the input signal exceeds the upper and lower limits, It integrates the function of a meter relay that outputs an output. When setting the upper and lower limit values, a reset request is made if the value exceeds the input range of the transducer, so that only the value within the input range can be accepted.

[Backbone of invention]

A conventional transducer, such as a voltage transducer, converts the input terminal of a potential transformer (PT), e.g. The resulting current is converted into a DC voltage within a certain range. Such various conventional transducers have only the function of converting an input physical quantity into a DC voltage within a predetermined range corresponding to the input physical quantity. Then, it is necessary to use a meter relay to display the input value, set the lower limit value and upper limit value of the input value, and obtain an output when the input value exceeds the range. However, since the transducer and the meter relay are independent devices and must be wired separately, there are problems in that the wiring becomes complicated and the installation space becomes large. Another problem is that the output voltage of the transducer and the upper and lower limits at which the meter relay operates do not necessarily match, making it difficult to use.

When a numerical input switch such as a thumb rotary switch is used to set the upper and lower limit values, there is a problem in that the input value cannot be limited to a predetermined range.

[Purpose of the invention]

The present invention has been made in view of the problems of conventional transducers, and provides a function for setting a predetermined range of input values in a transducer that converts an input signal into a DC voltage within a predetermined range, and a function for setting a predetermined range of input values and the range thereof. The purpose of the present invention is to provide a transducer that is capable of adding and integrating the function of a meter relay that obtains an output when the value exceeds the limit value, as well as limiting the input range of the upper and lower limit values to within the input range of the transducer. do.

[Structure and effects of the invention]

The present invention is a transducer that converts an input signal within an allowable input range into a signal of a predetermined level corresponding to the input signal, and the present invention is an A/D converter that converts an analog input signal into a digital signal.
a converter, upper and lower limit setting means for setting upper and lower limits of an input signal, comparing the input with an input within an allowable input range, and requesting resetting when the input exceeds this range to set upper and lower limits; storage means for storing the current value and the upper and lower limit values set by the upper and lower limit value setting means;
A/D-converted input signal and upper and lower limit values held in the storage means are compared; The device is characterized by having a D/A converter that converts an input signal A/D converted by the D converter into a signal proportional to the level of the input signal.

According to the present invention having such characteristics, it is possible to obtain a linearized output within a predetermined range corresponding to the input signal, and when the input signal exceeds the upper and lower limit value range set by the upper and lower limit value setting means. This makes it possible to create a transducer with the function of a make relay that obtains an output. When setting the upper and lower limits, the input is compared with the input within the allowable input range, and when this range is exceeded, a reset request is made, thereby limiting the upper and lower limits to the input range of the transducer. It is possible to prevent incorrect setting of upper and lower limit values that exceed the limit values. Furthermore, there is no difference between the display of the transducer and the output when the upper and lower limits are exceeded, making it possible to provide an easy-to-use transducer. Furthermore, compared to the case where a conventional transducer and meter relay are used, the number of wiring in the input section is reduced, and the configuration can be simplified.

Furthermore, it is possible to reduce the size and cost compared to the case where two devices are used.

[Description of Embodiments] C Configuration of Embodiment) FIG. 1 is a block diagram showing the electrical configuration of an embodiment of a transducer according to the present invention, and FIG. 2 is a front panel diagram thereof. In this example, the AC input of θ~150V is
It is assumed that the transducer converts to ~5V DC output.

In these figures, an inlet sofa 2 is connected between input terminals 1a and lb. The input buffer 2 receives an AC input at high impedance, divides the voltage, rectifies the divided voltage output, and supplies the rectified voltage to the A/D converter 3. The A/D converter 3 converts the analog signal applied at a predetermined timing into a digital signal and provides the output to the microcomputer 4.

The microcomputer 4 is a control element having therein a microprocessor, a human output interface, and a storage means having a control program and a group of registers shown in the figure. The registers in the microcomputer 4 include flag registers for the PV flag, H flag, and L flag, which indicate the display status, and the XH flag and XL flag, which are set when the current value exceeds the upper and lower limits and the relay is driven. Further, a Pv value register for storing the current value and an H setting value register for storing the upper limit setting value are provided.

A set value register is provided to store a lower limit set value. The microcomputer 4 is also connected to a slide switch SLI for switching between set mode and run mode, a push button switch for setting numerical values to sequentially switch the display of each digit on the display, and a push button switch PB5 for switching the display contents from PBI to PB4°. Furthermore, the output of the model selection switch 5 is given. The model selection switch 5 provides data for setting this transducer to a predetermined input/output specification, and it is necessary to use the input cover sofa 2 that corresponds to the input/output specification. microcomputer 4
provides the current value to the display 6 and the launch circuit 7 at predetermined time intervals based on these externally applied inputs. The latch circuit 7 holds the output of the microcomputer 4 for a predetermined period of time, and supplies the output to the D/A converter 8. The D/A converter 8 converts the digital signal into an output corresponding to the signal, for example, a DC output of 0 to 5, and outputs it to a terminal 9a,
It is given to the outside via 9b. The microcomputer 4 checks whether the input value exceeds the upper and lower limits. If the input value exceeds the upper and lower limits, an output is given to the output buffer 10. The output sofa 10 drives relay XH or relay XL in response to these inputs. Relays XH and XL have normally open contacts connected between terminals 11a, llb and 12a, 12b, respectively, and provide outputs to the outside from these terminals.

Furthermore, when relays XH and XL are driven, output buffer 10 connects light emitting diodes 13 and 14 (hereinafter referred to as L) at the top of the panel, respectively.
(referred to as ED) are respectively driven. Also, a PV display LED indicating the current output of the display 6 from the microcomputer 4.
15. H display LED16. An L display LED 17 is connected. On the other hand, commercial AC power is applied to the power supply section 19 from terminals 18a and 18b to supply DC power to each section.

(Upper/Lower Limit Value Setting Operation) Next, the operation of the transducer of this embodiment will be described with reference to a flowchart. Fig. 3 is a flowchart showing the operation when setting the upper and lower limit values that give the relay output from this transducer, Fig. 4 is a flowchart when inputting the upper and lower limit values, and Fig. 5 is the operation mode. This is the flowchart. When the operation starts, first, in step 21 of FIG. 3, it is checked whether or not it is the set mode. If the switch SLI is set to the set mode, the process advances to step 22 to check whether the pushbutton switch PB5 is pressed.

When this push button switch is pressed, the flag register is updated so that the PV flag, H flag, and L flag are set sequentially. Step 23) and the process proceeds to step 24.25 to check whether the H flag or L flag is set. Check. F (If the flag is set, proceed from step 24 to step 26, turn off the LED 17, and turn off the LE
D16 is turned on, rHJ is displayed on the panel surface, and the upper limit value setting routine 27 is entered. In this routine 27, the push button switch FBI-PB4 for setting numerical values is used to set the display 6.
The numerical value of each digit is set respectively, and the upper limit value is stored in the H setting value register. When this setting is completed, the process returns to step 21 to check whether the set mode is set and repeat the same process. If the L flag is set by updating the flag register in step 23, the process proceeds from step 25 to step 28, where the LED 16 is turned off and the LEDs ′ and 7 are turned off.
Turn on and display rLJ on the panel surface. Then, the program proceeds to the lower limit value setting routine 29, which is pressed in the same manner as routine 27, and the button switches PBI to PB4 are used to set the numerical values of each digit of the display 6, respectively, and the lower limit value is stored in the set value register in the memory. In this way, the process for setting the upper and lower limit values in the set mode is completed.

(Upper/Lower Limit Value Maximum Processing) Next, the processing of the upper/lower limit value setting routine of routine 27 or routine 29 will be described in more detail. Since the transducer of this embodiment is a transducer that converts an AC input of 0 to 150 cm into a DC output, the upper and lower limits are 0 to 150. Values up to OV are allowed. Therefore, in the upper and lower limit value setting routines 27 and 29, the upper and lower limit values are limited within this range. That is, in the flow chart shown in Fig. 4, when the operation starts, the upper limit value or lower limit value 4 is first set.
The key data of the digit is read (step 31). If there is key power, the process proceeds from step 32 to step 33 and the fourth digit data is incremented; if there is no key power, the process proceeds to step 34 without performing this process and the fourth digit data 2 is positive or O. Check to see if it exists. If this is positive or O, the fourth digit is 2 or more, so in step 35 the fourth digit of the display 6 blinks.
The operator is requested to reset the settings, and the process returns to step 31. If this data is positive or 0, O or 1 is set in the 4th digit, so proceed to step 36, read the 3rd digit key data, and check whether there is any key input (step 3).
7).

Then, if there is key power, the third digit is incremented (step 38); if there is no key power, the process proceeds to step 39 without performing this process and checks whether the third digit data is A in hexadecimal.

If this data is A, set the third digit to O and step 40
), if it is not O, proceed to step 4 without performing this process.
Proceed to step 1 and check whether the fourth digit is 1. If this data is 1, 1 from O to 5 is allowed as the third digit data, so proceed to step 42 and check whether the third digit data 6 is positive or O. If this data is positive or 0, 6 or more has been set as the data in the third digit, so the process proceeds to step 43, where the third digit is decremented, a reset request is made, and the process returns to step 36. If the third digit data 6 is not O or positive in step 7, step 42, it is checked whether the third digit is 5 (force). If the third digit is 5, proceed to step 45, set the data of the first digit and the second (line) to 0, and end this routine. If the fourth digit is not 1 in step old, or If the third digit data is not 5 in step 44, data from O to 9 is allowed as the second digit, so step 46
The program advances to step 47 to read the key data on the 21st line, and if there is the key power, the program advances to step 48 via step 47 and increments the second digit data. If there is no key human power, do not perform this process and proceed to Step 2 (Step 50) to check that the second digit data is A in hexadecimal, but it is 1. If the 2-digit child's day/evening is A, step 5 (in step 5, set the second digit data to O, and if it is not A, complete the process on the 24th line without performing this process, then step 51
Proceed to step 51 to step 55, data from O to 9 is allowed to be input as the first digit data in the same way as the second digit, and this setting processing routine ends.

(Operation in run mode) After setting the upper limit value and lower limit value, press the selector switch SL.
Set I to run mode. The microcomputer 4 of the transducer checks whether it is set mode or run mode in step 21 and step 60 shown in FIG.
If it is the run mode, the process proceeds to step 61, where subsequent inputs from the pushbutton switches PBI to PB4 are invalidated. Then, in step 62, the data of the model selection switch 5 is read and input/output specifications are determined in accordance with the data. For example, the transducer of this embodiment is O~15
Assuming that the transducer converts an AC voltage of 0V to a corresponding DC voltage of 0 to 5■, step 6
From 3.64, set the specifications accordingly. Then, the input voltage applied from the input terminals 1a and lb is rectified by the input cover sofa 2 to be divided into voltages r. Since its output is applied to the A/D converter 3, the microcomputer 4
The sampling pulse is sent to the A/D converter 3 at predetermined intervals.
and input the data converted into digital values into the PV value register in the memory (step 65).

Then, the process proceeds to step 66, where it is checked whether the H flag is set, and if this flag is set, the upper limit value held in the H setting value register that is already stored is displayed on the display 6. At the same time, LED15
．． 17 is turned off and the LED 16 is turned on to display the H setting value (steps 57, 68>.Also, if the L flag is set in step 69, it is similarly held in the H setting value register in the memory. In order to display the lower limit value of
Display the setting value. Furthermore, in steps 66 and 69, H
If the flag and L flag are not set, G, P■
Since the flag has been set, the process proceeds to step '72, where the current value in the PV value register taken in at step 65 is displayed on the display 6, and is also given to the launch circuit 7 to be temporarily held. Next step 73 ↓ LE
D16.17 is turned off, LED 15 is turned on to display the current value, and D/A converter 8 outputs O corresponding to the input voltage.
-5■ is outputted to the outside from terminals 9a and 9b (step 74). Further proceed to step 75 and PV
Check whether the current value in the value register exceeds the setting value in the H setting value register. If the current value does not exceed the H setting value, the XH flag, XH relay and LED1
3 is turned off (step 76), and if the H setting value is exceeded, the XH flag and XH relay are turned on and the LED 13 is turned on in step 77. and step 7
In step 8, it is checked whether the current value in the PV value register is less than or equal to the L setting value, and if it is not less than the L setting value, in step 79, the XL flag, XL relay, and LED are
14 is turned off, and if it is below the L setting value, the XL flag and XL relay are turned on and the LED 14 is turned on (step 80). Further, the process proceeds to step 8X to check whether or not the push button switch PB5 has been pressed. If it has not been pressed, the process returns to step 60 and the same process is repeated. If the push button switch PB5 is pressed, P■ in the flag register is Update the flag, H flag, and L flag to be set sequentially (step 82) and step 60
6. Return.

In this way, you can display the input voltage and obtain a DC linearized output corresponding to the input voltage. Furthermore, you can set the upper and lower limits of the power using two setting value registers, and if the range is exceeded, It becomes possible to create a transducer that has the function of a meter relay that obtains an output. At this time, since the upper and lower limit values cannot be set beyond the input range specific to the transducer, incorrect upper and lower limit values will not be set.

In this embodiment, if each digit is input, a resetting request is made if there is an input that exceeds the allowable range of the lower digits, but after all digits have been input, this transducer It is also possible to compare the input range with the input range and issue a reset request when the range is exceeded.

Furthermore, although this embodiment has described a transducer that converts an alternating current voltage within a predetermined range into a direct current voltage, a transducer that accepts different inputs by changing the input specifications in the input cover sofa and operating mode, such as an alternating current voltage, may also be used. The present invention can be applied to a transducer that detects current or direct current, or a transducer that converts the temperature of a thermocouple or the like or the output of a tacho generator or the like or the output of a potentiometer into a signal within a predetermined range.

Further, although this embodiment describes a transducer having a tolerance range of 0-150V, it goes without saying that the present invention can be similarly applied to transducers having other tolerance ranges. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the transducer according to the present invention, FIG. 2 is a front panel view thereof, FIG. 3 is a flowchart showing operation in set mode for setting upper and lower limit values, and FIG. 4 5 is a flowchart showing the input processing of the upper and lower limit values, and FIG. 5 is a flowchart showing the operation in run mode. 2--One person buffer 3--A/D converter 4, ---1 microcomputer 5--Model selection switch 6-----1 display 7---
-Latch circuit 8--D/A converter 10----
-1 output bar/2fa XH, XL-1...-Relay 1
3~17-...--Light emitting diode 5LL--
Mode selection switch PB1~PB5・------・
Push button switch patent applicant Tateishi Electric Co., Ltd. Agent Patent attorney Kanki Okamoto (and one other person) Figure 2

Claims (2)

[Claims] (1) A transducer that converts an input signal within an allowable input range into a signal at a corresponding predetermined level, comprising an A/D converter that converts an analog input signal into a digital signal, and an upper and lower limit of the input signal. upper and lower limit value setting means for setting the upper and lower limit values by setting the value and comparing it with the input within the allowable input range and requesting resetting when the range is exceeded; and setting by the current value and the upper and lower limit value setting means. storage means for storing upper and lower limit values held in the storage means; comparison means for comparing the input signal A/D converted by the A/D converter with the upper and lower limit values held in the storage means; and the comparison means an output means that outputs an output when the current value exceeds the upper and lower limit values by comparison; and a D/A converter that converts the input signal A/D converted by the A/D converter into a signal proportional to the level thereof. A transducer comprising: (2) The transducer according to claim 1, wherein the output means includes two relays that are respectively activated when the upper and lower limits are exceeded.