JP3224651B2 - Digital output device with inspection output - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital output device suitable for use in a measurement control device such as an industrial machine and an automation device.

[0002]

2. Description of the Related Art A conventional digital output device inspection method will be described with reference to FIG. FIG. 9 is a block diagram showing the connection of devices when testing a conventional digital output device.

[0003] As shown in FIG. 9, in testing a conventional digital output device 20, a digital signal output device 2 is externally provided.
1 and inputting inspection data from the digital signal output device 21.

First, an expected result which is expected to be output from the digital device 20 with respect to the inspection data input from the digital signal output device 21 is prepared. Next, a result of the digital device 20 actually outputting the test data input from the digital signal output device 21 is obtained.

[0005] The digital output device 20 is inspected by comparing the expected result with the actually output result. As another method, a memory 3 or a one-chip microcomputer incorporating an inspection program is prepared, and the inspection is performed by executing the program.

[0006]

As described above, in the conventional method for testing a digital output device, a digital signal output device must be provided externally for performing digital output, and a test signal must be input from the digital signal output device. was there.

At this time, if the digital output device performs data communication using a specific protocol, a digital signal output device for transmitting data using the same protocol as the communication protocol is required.

For this reason, not only inspection at the time of factory shipment,
It was necessary to prepare the above-mentioned inspection equipment at the time of on-site adjustment and inspection after product shipment, which was very inconvenient. Also, in the case of a method of preparing a memory or a one-chip microcomputer incorporating a test program and performing a test, the memory or the one-chip microcomputer may need to be replaced. There was inconvenience such as having to prepare.

The present invention has been made in view of the above circumstances,
It is not necessary to install a digital signal output device for inspection, etc., it is possible to carry out inspection just by switching the switch, and it is possible for the operator to easily identify the operation contents of this digital output device. To provide a digital output device.

[0010]

According to the present invention, there is provided a digital output device with an output for inspection according to the present invention, a display device for displaying the operation contents of the device, a rotary switch or several changeover switches for switching the operation contents of the device, When this device is communicating with the control device that is the master station, normal operation is performed, and when there is no communication and the switch is kept at a specific position for a certain period of time or longer, the operation is switched to the inspection operation, and then the switch is switched to another operation. (1) Turn on at regular intervals one port at a time. (2) Turn off all ports. (3) Turn on all ports. And the like, which outputs inspection data such as the above, and controls the display of the display device in synchronization with the operation of the switch.

[0011]

When testing the digital output device with test output of the present invention, the digital output device with test output is mounted on the digital output device by operating a switch in a specific procedure in a state where communication is not performed. The microcomputer outputs inspection data, and controls the display of the display device in synchronization with the operation of this switch.

This makes it possible to carry out the inspection only by switching the switch, and it is possible to easily identify the operation contents of the digital output device by the display on the display device.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a digital output device with a test output according to the embodiment. As shown in FIG. 1, the apparatus includes a microcomputer 2, a memory 3, an output buffer 4, a display output buffer 5, a switch input buffer 6, an output port 7, a display 8, a rotary switch 9, and a data communication circuit 10. It is configured.

The microcomputer 2 according to the embodiment uses the memory 3. However, in the case of a one-chip microcomputer, the memory 3 becomes unnecessary, and the memory is built in the one-chip microcomputer. In addition, the power supply circuit, the clock circuit, and the like are publicly known, and thus are omitted.

A digital output device 1 according to the embodiment
Are "0", "" by operating the rotary switch 9.
It is assumed that seven types of operation contents of A "," B "," C "," D "," E ", and" F "can be switched.

Inspection digital output device 1 according to the present invention
Means that the normal operation (communication mode ON) is performed when the data communication circuit 10 is communicating with the control device serving as the master station, and the switch is kept at the "F" position for a certain period of time without communication. Inspection operation (inspection mode ON)
Switch to.

After switching to the inspection operation, the switch is set to "
When switching to the position of E ”, the microcomputer 2
Outputs the inspection data to the output buffer 4 so as to be ON for a certain period of time for each port.

When the switch is switched to the position "D", the microcomputer 2 outputs inspection data to the output buffer 4 so that all ports are turned ON. Further, when the switch is switched to the position “C”, the microcomputer 2 outputs the test data to the output buffer 4 so that all the ports are turned off.

During normal operation, an input signal received by the data communication circuit 10 is transferred from the microcomputer 2 to the output buffer 4, amplified by the output buffer 4, and output from the output port 7.

When the inspection is performed, the operator operates the rotary switch 9 in the above procedure to switch from the normal operation to the inspection operation. The switching information of the rotary switch 9 is converted into an appropriate signal via the switch input buffer 6, and then input to the microcomputer 2. The microcomputer 2 having received the signal from the switch input buffer 6 outputs the test data for inspection to the output buffer 4.
And display data indicating the current inspection content is output to the display 8 via the display output buffer 5. The display 8 receiving the display data from the microcomputer 2 performs display based on the display data.

Next, the operation of the embodiment will be described. FIG. 2 is a flowchart for explaining a control procedure of the digital output device according to the embodiment, and FIG. 3 is a flowchart for explaining a processing procedure of communication data processed by interruption according to the embodiment.

When the power is turned on, the digital output device 1 initializes the microcomputer 2, the output buffer 4, and the display output buffer 5 (step A in FIG. 2).
1). After the initialization, a normal loop state is entered, and it is first determined whether or not data to be output has been set (step A2 in FIG. 2). If the data to be output is set (Y in step A2 in FIG. 2), this data is output to the output buffer 4 (step A3 in FIG. 2).

If data to be output has not been set (N in step A2 in FIG. 2), it is determined whether a communication timeout has occurred (step A4 in FIG. 2), and a communication timeout has occurred. In such a case, communication initialization accompanying a communication timeout is performed (step A5 in FIG. 2).

Next, the position of the rotary switch 9 is read (step A6 in FIG. 2), and the operation contents (normal or various inspections) are set in synchronization with the operation of the rotary switch 9 (step A7 in FIG. 2). ). The set of operation contents will be described later.

Then, display data synchronized with the operation contents is generated, and the display unit 8 displays the operation contents (step A8 in FIG. 2). The communication data is processed by interruption, and as shown in FIG. 3, data reception by the data communication circuit 10 (step B1 in FIG. 3), transmission of data (step B2 in FIG. 3), and communication mode by the microcomputer 2 (Step B3 in FIG. 3).

Next, the procedure for setting the operation content will be described with reference to FIG. FIG. 4 is a flowchart for explaining a procedure for setting operation contents according to the embodiment.

First, the communication timer is checked (step C1 in FIG. 4), and only when the time is up (when there is no communication for a certain period of time) (Y in step C1 in FIG. 4), the communication mode is turned off (FIG. 4). 4 Step C2).

Next, the processing is distributed according to the position of the switch as follows (step C3 in FIG. 4). First, when the positions of the switches are "C" to "F", steps corresponding to the respective positions (steps C4 in FIG. 4 to step C7 in FIG. 4, details will be described later) are executed, and "0" to "0""B"
In the case of, the inspection mode is turned off (Step C in FIG. 4)
8) A display synchronized with the operation of the rotary switch 9 is performed (step C9 in FIG. 4).

Next, referring to FIG.
The processing procedure when the switch position is "F" will be described. Fig. 5 is a flowchart for explaining the processing procedure when the switch position is "F" according to the embodiment.

First, it is determined whether the communication mode is ON or OFF (step D1 in FIG. 5). When the switch is OFF (no communication for a certain period of time or longer) (OFF in step D1 in FIG. 5), it is determined whether or not the rotary switch 9 has been switched (step D2 in FIG. 5). If it has been set (Y in step D2 in FIG. 5), a switching timer is set (step D3 in FIG. 5).

Next, it is determined whether or not the switching timer has timed up (step D4 in FIG. 5). Has elapsed (Y in step D4 in FIG. 5), the inspection mode is turned ON (step D5 in FIG. 5).

Next, the test mode is determined (step D6 in FIG. 5), and if the test mode is ON, the data is transferred to the display so as to display "TEST" (completion of switching to the test mode) (FIG. 5). If the inspection mode is OFF, the data is transferred to the display so as to display "CHEK" (while switching to the inspection mode) (OFF in step D6 in FIG. 5).

Next, referring to FIG.
The processing procedure when the switch position is “E” will be described. FIG. 6 is a flowchart for explaining the processing procedure when the switch position is “E” according to the embodiment.

First, the inspection mode is determined (step E1 in FIG. 6), and when the inspection mode is ON (ON in step E1 in FIG. 6), the polling output for inspection is turned on for one port at a time for a certain period of time. Data is set (step E2 in FIG. 6).

Then, the data is transferred to the display so as to display the character "* POL" (inspection content is polling) indicating that the inspection content is polling (step E3 in FIG. 6).

When the inspection mode is OFF (see FIG. 6)
(Step E1 is OFF), the switch is switched to "E" before the operation of switching the switch position to "F" and a predetermined time is elapsed before the operation is completed. In this case, an error to that effect is displayed. (Step E4 in FIG. 6).

Next, referring to FIG.
The processing procedure when the switch position is "D" will be described. Fig. 7 is a flowchart for explaining the processing procedure when the switch position is "D" according to the embodiment.

First, the inspection mode is determined (step F1 in FIG. 7). If the inspection mode is ON (ON in step F1 in FIG. 7), output data for inspection is set so that all ports are OFF. (Step F2 in FIG. 7).

Then, the data is transferred to the display so as to display the character "* OFF" (inspection content is all ports OFF) indicating that the inspection content is all ports OFF (step F3 in FIG. 7).

When the inspection mode is OFF (see FIG. 7)
(Step F1 of OFF), the switch is switched to "D" before the operation of switching the switch position to "F" and a predetermined time is passed before the operation is completed. In this case, an error to that effect is displayed. (Step F4 in FIG. 7).

Next, referring to FIG.
The processing procedure when the switch position is "C" will be described. FIG. 8 is a flowchart for explaining the processing procedure when the switch position is "C" according to the embodiment.

First, the inspection mode is determined (step G1 in FIG. 8). If the inspection mode is ON (step G1 in FIG. 8), output data for inspection is set so that all ports are ON. (Step G2 in FIG. 8).

Then, the data is transferred to the display so as to display the characters "* ON *" (inspection contents are all ports ON) indicating that the examination contents are all ports ON (step G3 in FIG. 8).

When the inspection mode is OFF (see FIG. 8)
Step G1 is OFF), the switch is switched to "C" before the operation of switching the switch position to "F" and a predetermined time is passed before the operation is completed. In this case, an error to that effect is displayed. Then, the data is transferred to the display device (Step G4 in FIG. 8).

As described above, in the test of the digital output device with test output 1 according to the present embodiment, simply by switching the rotary switch 9, (1) the ports are turned on one by one at regular intervals. (2) Turn off all ports. (3) Turn on all ports. The operator can easily grasp the operation contents of the digital output device with the inspection output because the operation contents performed by the digital output device with the inspection output are displayed on the display. It is possible.

[0046]

According to the present invention, there is no need to install a digital signal output device for inspection, etc., but only by switching a switch. (2) Turn off all ports. (3) Turn on all ports. Inspections can be performed.

As a result, not only inspection at the time of product shipment can be facilitated, but also at the site of use after shipment of the device,
The quality of the digital output device itself can be easily inspected, and it is possible to greatly save labor when inspecting after-service. Further, since the operation contents performed by the digital output device with inspection output are displayed on the display, the operator can easily grasp the operation contents.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital output device with a test output according to an embodiment of the present invention.

FIG. 2 is an exemplary flowchart for explaining a control procedure of the digital output device according to the embodiment.

FIG. 3 is an exemplary flowchart for explaining a processing procedure of communication data processed by an interrupt according to the embodiment;

FIG. 4 is an exemplary flowchart for explaining an operation mode setting procedure according to the embodiment.

FIG. 5 is an exemplary flowchart for explaining a processing procedure when the switch position is “F” according to the embodiment;

FIG. 6 is a flowchart for explaining a processing procedure when the position of the switch is “E” according to the embodiment;

FIG. 7 is an exemplary flowchart for explaining the processing procedure when the switch position is “D” according to the embodiment;

FIG. 8 is a flowchart for explaining a processing procedure when the switch position is “C” according to the embodiment;

FIG. 9 is a block diagram showing device connections when testing a conventional digital output device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Digital output device with test output, 2 ... microcomputer, 3 ... memory, 4 ... output buffer, 5 ... display output buffer, 6 ... switch input buffer, 7 ... output port, 8 ... display, 9 ... rotary type Switch, 10: Data communication circuit, 20: Conventional digital output device, 21: Digital signal output device for test.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01D 3/10 G01D 18/00 G01R 31/00

Claims (1)

(57) [Claims] 1. A device which carries a communication and control microcomputer and performs digital output, comprising: a display device for displaying the operation content of the device; a rotary switch or several changeover switches for switching the operation content of the device; And a microcomputer that outputs inspection data when the switch is operated in a specific procedure in a state where the device is not performing communication, and that controls display of the display device in synchronization with the operation of the switch. A digital output device, comprising: