JPH04218805A - Monitor device for programmable controller - Google Patents

Abstract

PURPOSE:To obtain a monitor device for programmable controller provided with an abnormality diagnosing function for programmable controller which diagnoses the trouble position of a system to shorten the recovery time of the system. CONSTITUTION:Output information and input information due to communication with the CPU unit of a programmable controller are compared with each other through an interface 4 for CPU unit, which is so connected that it can communicate with the CPU unit of the programmable controller, and an interface 5 for I/O slot which can be set to a mother board, thereby diagnosing whether an I/O unit in the programmable controller is abnormal or not. Thus, the system is inexpensively obtained which is recovered from system down in a relatively short time and has a high precision.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor device for a programmable controller (hereinafter referred to as a PC) having an abnormality diagnosis function.

0002

2. Description of the Related Art FIG. 2 shows a conventional PC for creating a PC control program such as a sequence program for a PC that sequentially controls a control object such as a belt conveyor, and for monitoring a PC that sequentially controls the control object.
1 is a block diagram of a monitor device, in which 1 is a control circuit, 2 is a keyboard, 3 is a CRT, and 4 is a P for connecting to a PC.
This is an I/F for C. Furthermore, FIG. 3 is a schematic diagram of a PC having an I/O slot connected to an I/O unit 8, which will be described later, in which 6 is a CPU unit, and 7 is a CPU unit 6 and an I/O unit 8, which will be described later, are integrally installed. 8 is an I/O unit, 61 is an interface for connecting a PC monitor device (hereinafter referred to as monitor I/F), 70 is a C
CPU connection slots 71 to 75 for mounting and connecting the PU unit 6 are I/O slots for mounting and connecting the I/O unit 8, and are provided on the motherboard 7.

Next, the operation will be explained. A PC control program created using the keyboard 2 and CRT 3, which are man-machine interfaces, is a PC I/F.
4 to a memory (not shown) in the CPU unit 6 of the PC shown in FIG. The CPU unit 6 controls the I/O unit 8 according to the stored PC control program. That is, it becomes possible to control, for example, a belt conveyor (not shown) connected to the I/O unit 8. Furthermore, the I/F 4 is used to connect the
/O unit 8 ON/OFF information is monitored and CR
T3 can be displayed to monitor the operating status of the belt conveyor, etc.

0004

[Problems to be Solved by the Invention] Since the conventional PC monitor device is configured as described above, for example, the I/O
If a phenomenon occurs in which the I/O unit 8 installed in the slot 73 does not perform the output operation normally, replace it with another I/O unit that operates normally and check the situation in order to investigate the cause of the abnormality. If the result is also abnormal, it is assumed that the cause of the abnormality is in the motherboard 7, and it is necessary to replace it and judge whether it is good or bad. The problem was that it took a long time.

[0005] The present invention was made to solve the above problems, and provides a PC monitor equipped with a PC abnormality diagnosis function that can diagnose system failure points and shorten system repair time. The purpose is to obtain equipment.

[0006]

[Means for Solving the Problems] A monitor device for a programmable controller according to the present invention includes an I/O unit for input/output to a controlled object, a CPU unit that controls the controlled object, the I/O unit and the CPU. monitoring means for monitoring the operating state of a programmable controller having a motherboard to which the unit is mounted;
A CPU unit interface that connects to the PU unit for communication, an I/O slot interface that can be installed on the motherboard instead of the I/O unit, and output information output from the CPU unit interface to the CPU unit. is input from the I/O slot interface as input information, or output information output from the I/O slot interface to the CPU unit is input from the CPU unit interface as input information, and the output information is input as input information. and an abnormality diagnosis means for diagnosing the presence or absence of an abnormality in the I/O unit in the programmable controller by comparing the input information and the input information.

[0007]

[Operation] The abnormality diagnosis means in the present invention inputs output information outputted to the CPU unit via the CPU unit interface of the programmable controller as input information via the I/O slot interface of the programmable controller, or The above CP via the above I/O slot interface.
The output information output to the U unit is input as input information via the CPU unit interface, and the output information and input information are compared to diagnose whether or not there is an abnormality in the I/O unit that constitutes the programmable controller. do.

[0008]

[Example] Example 1. An embodiment of the present invention will be described below. In FIG. 1, 5 is an I/O slot 71 of the motherboard 7 of the PC.
This is an I/F for an I/O slot provided in the monitor device so that it can be connected to 75. Further, those having the same reference numerals as those in the conventional example have the same or equivalent functions, and the explanation thereof will be omitted.

Next, the operation will be explained. A PC control program such as a sequence program created using the keyboard 2 and CRT 3, which are man-machine interfaces, is transferred to the PC control program shown in FIG. 3 via the PC I/F 4.
The data is stored in a memory (not shown) in the CPU unit 6 of C. The CPU unit 6 controls the I/O unit 8 according to the stored PC control program. That is, it becomes possible to control, for example, a belt conveyor (not shown) connected to the I/O unit 8. Also, PC I/
Turn on/off the I/O unit 8 from the PC via F4.
The OFF information is monitored and displayed on the CRT 3 to monitor the operational status of the belt conveyor and the like. The above is a case where the PC system is normal. Next, a case where an abnormality occurs in the PC system will be explained.

[0010] For example, an I/O slot installed in the I/O slot 73
If a phenomenon occurs in which the /O unit 8 does not output normally, connect the I/O slot I/F 5 of the PC monitor device to the slot 73 instead of the I/O unit 8, and at the same time By connecting the I/F 4 to the peripheral I/F 61 built into the CPU unit 6, system diagnosis becomes possible. In other words, the CP via PC I/F4
The information is transmitted to the U unit 6, the information is sent from the CPU unit 6 to the I/O slot 73 via the motherboard 7, and as a result, the information is sent to the programming device via the I/O slot I/F 5. Received. Therefore, if the received information is normal, the I/O unit 8 installed in the I/O slot 73 is judged to be abnormal; on the other hand, if the received information is abnormal, the I/O
Unit 8 is determined to be normal.

In the above embodiment, the I/O unit 8 was explained as an output unit, but it goes without saying that the same effect can be obtained in the case of an input unit by transmitting the information flow in the opposite direction. .

0012

As described above, according to the present invention, the CPU unit can be connected to the CPU unit of the programmable controller through the CPU unit interface that is communicably connected to the CPU unit and the I/O slot interface that can be attached to the motherboard. Since the configuration is configured such that it is possible to diagnose whether or not there is an abnormality in the I/O unit in the programmable controller by comparing the output information and input information from the communication, the time required to repair the system down is relatively short.
Moreover, there is an effect that a highly accurate product can be obtained at low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a PC monitor device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional PC monitor device.

FIG. 3 is a diagram showing a state in which a PC monitor device is connected to a PC.

[Explanation of symbols]

1 Control circuit 2 Keyboard 3 CRT 4 PC I/F 5 I/F for I/O slot

Claims (1)

[Claims] [Claim 1] An I/O unit for input/output to a controlled object, a CPU unit that controls the controlled object, and an I/O unit for controlling the controlled object.
a monitor means for monitoring the operating state of a programmable controller having a motherboard on which an /O unit and a CPU unit are mounted; a CPU unit interface communicably connected to the CPU unit; and a CPU unit interface mounted on the motherboard in place of the I/O. A possible I/O slot interface and the output information output from the CPU unit interface to the CPU unit are input from the I/O slot interface as input information, or from the I/O slot interface to the above. Abnormality diagnosis that inputs output information output to the CPU unit from the CPU unit interface as input information, compares the output information with the input information, and diagnoses whether or not there is an abnormality in the I/O unit in the programmable controller. 1. A monitor device for a programmable controller, comprising: means.