JP2001141524A - Measuring instrument and measuring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure a measuring value based on an input from an input instrument to be displayed, and to display various kinds of mearured values without being affected by processing and limitation of an input range. SOLUTION: The thickness of a work 6 is operation-calculated in a programable controller 2 based on detection outputs of displacement sensors 3, 3, the measured value of the calculated thickness is transmitted to digital panel meter 1, and the digital panel meter 1 displays the received thickness value on a displaying part 4. The panel meter 1 has a communication function to the programable controller 2, and displays the various kinds of measured values measured by the controller 2 or the measured values provided by the processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring instrument such as a digital panel meter and a measuring system using the same.

[0002]

2. Description of the Related Art A measuring instrument of this kind, for example, a digital panel meter performs various measurements such as temperature and rotation speed based on an input from an input device such as a sensor or a switch, and displays the measured value on a display section. In addition, in those provided with a communication function, the measured data is transmitted to, for example, a programmable controller, and the programmable controller is configured to collect and accumulate the measured data and perform statistical processing and the like. I have.

[0003]

However, the conventional digital panel meter has a limitation in the input range of the internal measuring circuit. For example, in the case of an analog input, there is a limitation of 1 to 5 V and 4 to 20 mA. Therefore, there is a problem that only an input from a sensor or the like satisfying the input range can be measured.

A conventional digital panel meter is
There is also a drawback in that it is not possible to display a calculation result by performing a complicated calculation process based on the measured value, and it is not applicable to a measurement that requires a complicated calculation process.

The present invention has been made in view of the above points, and can measure and display a measured value based on an input from an input device, without being restricted by arithmetic processing and an input range. It is an object of the present invention to provide a measurement device capable of displaying various measurement values and a measurement system using the same.

[0006]

In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, a measuring device of the present invention is a measuring device for displaying a measured value on a display unit based on an input from an input device, and includes a communication unit for communicating with an external device. The communication data received by the unit is displayed on the display unit.

According to the present invention, various measurements can be performed based on an input from an input device such as a sensor and the measured values can be displayed on a display unit, while communication data transmitted from an external device such as a programmable controller can be transmitted. The received communication data can be displayed on the display unit.

[0009] In one embodiment of the present invention, the communication data is a measured value obtained by the external device.

According to the present invention, even when measurement cannot be performed due to arithmetic processing or input range limitation, the measurement device calculates and measures the measured value with an external device such as a programmable controller and transmits the measured value to the communication device. Thus, the data can be transmitted to the measuring device and displayed on the measuring device.

In a preferred embodiment of the present invention, the measured value is compared with a preset set value, and the result of the comparison is output.

According to the present invention, a measurement value based on an input from an input device such as a sensor is compared with a set value and the result of the comparison is output as in the prior art, so that the quality of the measurement object can be determined. On the other hand, it is possible to perform a comparison determination with a set value for a measured value measured by an external device such as a programmable controller and transmitted to the measuring device.

[0013] In another embodiment of the present invention, the external device is a programmable controller.

According to the present invention, even in the case where the arithmetic processing cannot be performed by the measuring equipment, the measured value obtained by the arithmetic processing by the programmable controller can be transmitted to the measuring equipment and displayed on the display unit. Further, similarly to the related art, the measurement data obtained by the measuring device is transmitted to the programmable controller, collected and stored in the programmable controller, and the programmable controller can perform statistical processing and the like.

[0015] A measurement system according to the present invention is a measurement system comprising the measurement device according to any one of claims 1 to 4, the external device connected to the measurement device, and the input device connected to the external device. In the system, the external device calculates a measurement value based on an input from the input device and transmits the measurement value to the measurement device.The measurement device receives the measurement value and displays the measurement value on a display unit. To display.

According to the present invention, based on an input from an input device such as a sensor, various measurement values measured by the external device can be transmitted to the measurement device and displayed on the display unit of the measurement device.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a schematic configuration diagram of a measuring system according to one embodiment of the present invention. The measuring system includes a digital panel meter 1 as a measuring device, and a digital panel A programmable controller (P) as a higher-level external device connected to the meter 1
LC) 2 and two displacement sensors (linear sensors) 3 and 3 as input devices connected to the programmable controller 2. The programmable controller 2 includes a plurality of units such as a CPU unit, a communication unit, and an I / O unit.

Digital panel meter 1 of this embodiment
Is provided with a display unit 4 for displaying measured values, set values, and the like on the front thereof, and a plurality of operation keys 5 for setting various functions. It is used to input a value and to set an input type such as whether an input from an input device such as a sensor is an analog input or a pulse input.

The digital panel meter 1 can perform a measurement based on an analog input or a pulse input from an input device such as a sensor (not shown) and display the measured value on the display unit 4. The value is compared with a preset value (comparison value), and a comparison output as a result of the comparison is output. Further, the digital panel meter 1 has a communication function of communicating with the programmable controller 2 according to the RS485 standard.
The measurement data is transmitted to the programmable controller 2 in response to a request from the PC, and the measurement data is collected and accumulated by the programmable controller 2 to perform statistical processing and the like. It is the same as a digital panel meter.

Digital panel meter 1 of this embodiment
According to the present invention, various measurement values which could not be displayed conventionally due to calculation processing, input range limitation, and the like can be displayed.

That is, the digital panel meter 1 of this embodiment is configured to receive communication data transmitted from the programmable controller 2, for example, measured values and messages, and to display them on the display unit 4.
In the measurement system according to the embodiment shown in FIG. 1, a displacement using a laser or an ultrasonic wave which is fixedly arranged above and below a work 6 to be conveyed and detects distances A and B to the work 6, respectively. On the basis of the outputs of the sensors 3 and 3 and the distance K between the two displacement sensors 3 and 3, the programmable controller 2 calculates the thickness of the work 6 (K− (A + B)).
Is calculated, and the calculated measured value of the thickness is transmitted to the digital panel meter 1 and displayed on the display unit 4 of the digital panel meter 1.

The digital panel meter 1 performs measurement based on an analog input or a pulse input from an input device such as a sensor (not shown) and displays the measured value on the display unit 4 or transmits the measured value from the programmable controller 1. Whether to display the measurement value as the communication data on the display 4 can be set by a command from the programmable controller 2 and also by setting the input type using the operation keys 5 of the digital panel meter 1. Can be.

FIG. 2 is a block diagram of the digital panel meter 1 according to this embodiment, and portions corresponding to FIG. 1 are denoted by the same reference numerals.

The digital panel meter 1 has input circuits 7 and 8 to which an analog input or a pulse input from an input device such as a sensor is given in accordance with the setting by the operation keys 5.
And a microcomputer 9 for performing a comparison between a measured value and a set value, controlling each unit, and displaying the measured value and the like, while performing measurement based on inputs from the input circuits 7 and 8. 4, an operation key 5 for various settings, a communication circuit 10 for communicating with the higher-order programmable controller 2 and the like, and an output unit for outputting a comparison output which is a result of a comparison judgment between the measured value and the set value. 11 is provided.

FIG. 3 is a flowchart for explaining the display operation of the digital panel meter 1 according to this embodiment.

First, it is determined whether or not analog input is set as the input type (step n1). If it is set, analog input from an input device such as a sensor (not shown) connected to the digital panel meter 1 is determined. The input is A / D converted and stored in the input value data area (step n2), and pre-processing for display such as scaling processing is performed (step n3) and displayed as a measured value on the display unit 4 (step n4). .

If the analog input has not been set, it is determined whether or not the pulse input has been set (step n5). The value is stored in the input value data area (step n6), pre-processing for display such as scaling processing is performed (step n3), and displayed as a measured value on the display unit 4 (step n4).

The operation described above is a conventional example in which measurement is performed based on an analog input or a pulse input from an input device such as a sensor connected to the digital panel meter 1 and the measured value is displayed on the display unit 4. This is the same as the display operation of the digital panel meter.

In step n5, when the pulse input is not set, the flow shifts to communication processing (step n7).

FIG. 4 is a flowchart of the communication process. First, when a communication command is input from the upper programmable controller 2 (step n10), it is determined whether or not the command is a data read command. If it is a read command (step n11), the designated data is transmitted to the upper programmable controller 2 (step n12). This transmits the measurement data measured by the digital panel meter 1 in response to a request from the programmable controller 2 to the programmable controller 2, and the programmable controller 2 collects and accumulates the measurement data and performs statistical processing and the like. This is the same as the conventional example.

If it is not a data read command in step n11, a write command for setting various parameters such as parameters, for example, an input type such as an analog input or a pulse input, a set value, an input range, etc. Is determined (step n13), and if it is a write command, data is written to the designated parameter (step n1).
4). This is for performing various parameters of the digital panel meter 1 from the higher-order programmable controller 2, that is, various function settings, and is similar to the conventional example.

In step n13, when the command is not a parameter write command, the display data is rewritten (step n15), that is, the display data displayed on the display unit 4 is transmitted to the communication data transmitted from the programmable controller 2, for example, It is rewritten with the measurement value transmitted from the programmable controller 2. Specifically, similarly to the flowchart of FIG. 3 described above, the measured value transmitted from the programmable controller 2 is stored in the input value data area, and pre-processing for display such as scaling processing is performed, and the display unit 4 Is displayed as a measured value.

As a result, the measurement value transmitted from the programmable controller 2 to the digital panel meter 1 is displayed on the display unit 4 of the digital panel meter 1.

Therefore, in the measurement system shown in FIG. 1, a communication input is set as an input type from the programmable controller 2 to the digital panel meter 1,
In the programmable controller 2, the displacement sensors 3, 3
The thickness of the work 6 is calculated and calculated based on the output from
The calculated thickness measurement value is transmitted to the digital panel meter 1, and the digital panel meter 1 receives the measurement value and displays it on the display unit 4.

In this measurement system, the digital panel meter 1 sets analog input or pulse input as an input type, as in the conventional example, and performs measurement based on input from an input device such as a sensor (not shown). The measurement value can be displayed on the display unit 4 and a comparison output can be output.

Thus, the digital panel meter 1 is
It can be used as before, and if necessary, can also be used as a display device for a higher-level external device such as the programmable controller 2 or a personal computer. This requires two display devices and two measurement devices. Without the need for a single digital panel meter of the present invention, thereby improving space efficiency.
Cost can be reduced.

Further, the digital panel meter 1 can display various measured values which could not be displayed conventionally, due to arithmetic processing and restrictions on the input range.

As another embodiment of the present invention, the measurement values transmitted from the programmable controller 2 to the digital panel meter 1 are the same as those measured by the digital panel meter 1 in the same manner. Alternatively, a comparison with a preset value may be performed to output a comparison output.

As in the conventional example, the digital panel meter 1 outputs an alarm output (error output) when a measured value based on an input from an input device such as an external sensor (not shown) is abnormal. The alarm output is transmitted to the programmable controller 2 and the programmable controller 2 responds to the alarm output to notify the digital panel meter 1 of a message (character ) As communication data, and the message may be displayed on the display unit 4 of the digital panel meter 1. further,
The message of the occurrence of the abnormality may be displayed by blinking.

(Embodiment 2) FIG. 5 is a schematic configuration diagram of a measurement system according to another embodiment of the present invention, and portions corresponding to the above-described embodiment are denoted by the same reference numerals.

The measuring system of this embodiment uses the time required for each of the processes A, B, C, and D in the manufacturing line 12 by the sensors 13, 13, and 1 installed for each process.
Based on the outputs of the signals 3 and 13, the programmable controller 2 measures each of them, adds them, calculates the time required to complete all the processes, and further calculates the time required to complete all the processes. The operation rate indicating the operation state is calculated by dividing the operation rate by the target time, and the operation rate is transmitted to the digital panel meter 1 as a measured value and displayed on the display unit 4 of the digital panel meter 1.

Other structures and effects are the same as those of the first embodiment.

(Embodiment 3) FIG. 6 is a schematic configuration diagram of a measurement system according to still another embodiment of the present invention, and portions corresponding to the above-described embodiments are denoted by the same reference numerals. .

The measuring system according to this embodiment has an X-Y
The programmable controller 2 detects the rotation of each of the stepping motors 15 and 16 that rotationally drives a drive shaft for moving the table 14 in the X-axis direction and the Y-axis direction with a sensor such as an absolute type rotary encoder. The respective coordinates in the X-axis direction and the Y-axis direction from the reference coordinates are calculated, and the measured values of the calculated X-coordinate and Y-coordinate are transmitted to the two digital panel meters 1 and 1, respectively. These are displayed on the display units 4 and 4 of the panel meters 1 and 1, respectively.

Other configurations and effects are the same as those of the first embodiment.

(Embodiment 4) FIG. 7 is a schematic configuration diagram of a measurement system according to another embodiment of the present invention, and portions corresponding to the above-described embodiment are denoted by the same reference numerals.

The measuring system according to this embodiment detects the rotation of the two rollers 18, 18 that convey the sheet 17 with a sensor such as an absolute type rotary encoder and the like.
8 and 18 are calculated, and the digital panel meter 1
One of the calculated measured values is transmitted to the digital panel meter 1 and displayed on the display unit 4 in accordance with the operation output of the changeover switch 19 disposed in the vicinity of.

In this embodiment, the changeover switch 1
By the operation 9, the transport speed of the two rollers 18, 18 can be switched and displayed by one digital panel meter 1.

In this embodiment, two types of measured values are switched and displayed. However, more types of measured values may be switched and displayed, and the various types of measured values may be automatically displayed in order. May be switched and displayed.

Other configurations and effects are the same as those in the first embodiment.

(Embodiment 5) FIG. 8 is a schematic configuration diagram of a measurement system according to still another embodiment of the present invention, and portions corresponding to the above-described embodiments are denoted by the same reference numerals. .

The measuring system of this embodiment detects the rotation of each of the motors 21 and 22 for driving each of the belt conveyors of the two production lines L1 and L2 with a sensor such as an absolute type rotary encoder and the like. In step 2, the line speed of each of the production lines L1 and L2 is calculated, and the difference between the line speeds is calculated, and this speed difference is transmitted as a measured value to the digital panel meter 1 and displayed on the display unit 4 of the digital panel meter 1. To display.

Other configurations and effects are the same as those of the first embodiment.

(Other Embodiments) In the above embodiments, the present invention is applied to a digital panel meter, but the present invention is not limited to a digital panel meter, but may be based on an electronic counter, a timer or measured data. The present invention can also be applied to various measuring devices such as a temperature controller for performing control and other devices.

[0056]

As described above, according to the present invention, it can be used as a measuring device in the same manner as the conventional one, and can also be used as a display device of an external device if necessary. It is possible to use only one measuring device of the present invention without requiring two devices, and it is possible to improve space efficiency and reduce costs.

Further, the measuring instrument of the present invention can display various measured values which could not be displayed conventionally.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a measurement system according to one embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of the digital panel meter of FIG.

FIG. 3 is a flowchart for explaining the operation of the digital panel meter of FIG. 1;

FIG. 4 is a flowchart for explaining the operation of the digital panel meter of FIG. 1;

FIG. 5 is a schematic configuration diagram of a measurement system according to another embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a measurement system according to still another embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a measurement system according to another embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a measurement system according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Digital panel meter 2 Programmable controller 3 Displacement sensor 4 Display part 9 Microcomputer 10 Communication circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F041 MA01 MA05 2F069 AA46 BB34 CC06 DD24 GG04 GG07 GG09 GG58 GG71 JJ13 JJ25 NN00 PP06 QQ01 QQ11 5H223 AA05 AA15 CC03 CC08 DD03 EE02 EE06

Claims (5)

[Claims] 1. A measuring device for displaying a measured value on a display unit based on an input from an input device, comprising: a communication unit for communicating with an external device; and communication data received by the communication unit. Is displayed on the display unit. 2. The measuring device according to claim 1, wherein the communication data is a measured value obtained by the external device. 3. The measuring device according to claim 1, wherein the measurement value is compared with a preset value and a result of the comparison is output. 4. The measuring device according to claim 1, wherein the external device is a programmable controller. 5. A measuring system comprising: the measuring device according to claim 1; the external device connected to the measuring device; and an input device connected to the external device. The external device is configured to calculate a measurement value based on an input from the input device and transmit the measurement value to the measurement device.The measurement device receives the measurement value and displays the measurement value on a display unit. Measurement system.