JPS6278608A - Process input and output device with test function - Google Patents

Abstract

PURPOSE:To reduce the cost and to improve the reliability of a process input/ output device by substituting a microprocessor for an input/output test function of a process signal and therefore omitting a test hardware logic. CONSTITUTION:A CPU 16 is reset for execution of a program stored in a ROM 17. Thus a terminal equipment 4 waits for input of a command. When a command key word of one or two characters is supplied through the equipment 4 in response to the type of the process input/output to be tested. The execution is started for a program of a process input/output test. The desired parameters including the set value to a process input/output circuit 2 are supplied and the process signal is supplied from the circuit 2 in the case of an input test. While the output data is supplied through the equipment 4 in the case of an output test. The test result is displayed on the equipment 4 with the input test and shown in the form of a process signal through the circuit 2 in the case of the output test respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a process input/output device having a self-test function.

[Conventional technology]

Conventionally, this Yuzu process input/output device includes a process input/output circuit 2 for inputting and outputting process signals as shown in FIG.
Computer coupling unit 10 that interfaces with an industrial computer
, a changeover switch 7 for switching to testing, and a process input/output bus coupling section 9. When conducting an input/output test of process signals, test hardware logic 8 for displaying and setting test data is connected to the process input/output bus 5.

The test hardware logic 8 had a configuration as shown in FIG. 5 is a process input/output bus; 11 is a process input/output bus control circuit; 12 is a Fi digital input circuit; 13 is a process input/output bus;
14 is a switch for setting output data, 14 is a digital output circuit, and 15 is a lamp for displaying input data.

When performing an input/output test of a process signal, the changeover switch 7 connects the process input/output bus 5 to the test hardware logic coupling section 9, and a dedicated test hardware logic corresponding to the type of process input/output circuit 2 is connected. 8 needs to be connected.

Here, in order to conduct a process signal input test, a reference process signal is input from the process input/output circuit 2, and the process data is passed through the process input/output bus 5 to the test hardware logic 8. In the test hardware logic, the process input/output bus control circuit 11
The process data is then passed to the digital output circuit 14.

The digital output circuit 14 outputs process data to the input data display lamp 15.

On the other hand, in the case of a process signal output test, when the data to be output is set in the output data setting switch 13, the digital input circuit 12 inputs the data, and the process input/output bus control circuit 11 outputs it to the process input/output bus 5. . The process input/output circuit 2r converts the data into a process signal and outputs it.

[Problems to be solved]

The conventional process input/output device 1t described above uses the testing hardware logic 8 for data display and setting for input/output testing of process signals, but this internally includes a digital input circuit 12 and a digital output circuit. 14, it itself can be seen as a type of process input/output circuit, but it has the drawback of lacking reliability.

In addition, since the data display format and setting format of the process input/output device 6 differs depending on the type of the process input/output circuit 2,
It is necessary to prepare dedicated test hardware logic 8 for each, which has the disadvantage of being expensive.

[Means for solving problems]

The present invention aims to provide a process input/output device with a test function that can reduce costs, has high reliability, good operability, and can easily respond to changes in interface due to modification of process input/output circuits. It is something to do.

To this end, the present invention inputs process signals, which are analog signals such as voltage and current, and digital signals such as contact signals, from a process input/output circuit, and outputs process data to an industrial computer, or from a reverse pressure industrial computer. In a process input/output device that sends and outputs process control data to a process input/output circuit, it has a microprocessor circuit between the connection part with an industrial computer and the process input/output circuit, and is a terminal consisting of peripheral devices such as a keyboard and display. It is characterized by including a function that enables input/output tests such as display of process signal input data or output of process signals by connecting a device and inputting a 1- to 2-character command keyword and command parameters from a terminal device. This provides a process input/output device with a testing function.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an outline of one embodiment, and FIG. 2 is an embodiment for realizing a microprocessor circuit 2 of a process input/output device with a test function according to the present invention. 16
Reference numeral 17 indicates a CPU which is the central control of the apparatus; 17 a ROM which stores a program that performs a test function in accordance with commands from a terminal device; a RAM which is used as a work area when executing an 18Fi program; a 19Fi CPU; and a ROM.

CPU bus, 20, which serves as a data path between RAM, etc.
21 is a process input/output path coupling unit for connecting the process input/output bus 5 connected to the process input/output circuit to the CPU path, IO is a computer coupling unit for interfacing with an industrial computer, and 21 is a terminal device and R8232C. (JI
This is a terminal device coupling unit that provides an interface such as SC6361).

FIG. 5 VC shows a flowchart when performing an input/output test of process signals. First, the CPU 16 is reset and the program in the ROM 17 is executed. The terminal device then waits for command input. Depending on the type of process input/output to be tested, a command keyword of 1 or 2 characters is input from the terminal device, and the process human output test program starts to be executed. After inputting necessary parameters such as setting values for the process input/output circuit 2, in the case of a manual test, a process signal is input manually from the process input/output circuit, and in the case of an output test, output data is input from a terminal device. The result is terminal equipment #lK in case of manual test.
In the case of display and output tests, it appears as a process signal output from the process input/output circuit. After completing one test,
It will wait for the next command input.

〔Effect of the invention〕

As explained above, according to the present invention, process signals, which are analog signals such as voltage and current, and digital signals such as contact signals, are input from the process input/output circuit, and the process data is output to an industrial computer. In a process input/output device that sends and outputs process control data from an industrial computer to a process input/output circuit, a microprocessor circuit is installed between the connection part with the industrial computer and the process input/output circuit, and I1II function that connects a terminal device consisting of peripheral equipment and enables input/output tests such as displaying process signal input data or outputting process signals by inputting 1-2 character command keywords and command parameters from the terminal device. Since the process input/output device is equipped with a test function that eliminates the presence of mold, the process signal input/output test function is performed by a microprocessor, reducing costs and improving reliability by eliminating test hardware logic. It has the effect of

Since a terminal device such as a computer or a personal computer can be used, it has the effect of improving operability.

Furthermore, it is possible to cope with changes in the interface due to modification of the process input/output circuit, etc., simply by modifying the 7"' duram in the ROM.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing an embodiment of the present invention;
FIG. 2 is a block diagram for realizing a microprocessor circuit according to an embodiment of the present invention, FIG. 3 is a flow chart explaining the operation, and FIGS. 4 and 5 are diagrams showing a conventional example. FIG. 1... Process input/output device with test function 2... Process input/output circuit 3... Microprocessor circuit 4... Terminal device 6... Conventional process input/output device 10... Computer coupling unit 21 ...Terminal device coupling department agent Patent attorney Mura 1) Yu Miki Figure 4 Figure 3 Gate Figure 5

Claims (1)

[Claims] Input process signals, which are analog signals such as voltage and current, and digital signals such as contact signals, from the process input/output circuit and output the process data to an industrial computer, or conversely, process control data from the industrial computer. A process input/output device that sends output to a circuit has a microprocessor circuit between the connection part with an industrial computer and the process input/output circuit, and a terminal device consisting of peripheral devices such as a keyboard and display is connected to the terminal device. Process input/output with test function, characterized in that it includes a function that enables input/output tests such as display of input data of process signals or output of process signals by inputting a command keyword of 1 to 2 characters and command parameters. Device.