JPS58146907A - Diagnozing method of timing device - Google Patents

Abstract

PURPOSE:To discriminate the malfunction of a timing device by detecting no input of a timing signal within a prescribed period in an electronic computer to execute operations successively at a prescribed time interval by the timing signal from the timing device. CONSTITUTION:When a pushbutton switch 1 is depressed, a timing signal 7a is inputted to the electronic computer 3 through an input device 2a and a starting command 8a is applied from the computer 3 to the timing device 4 through an output device 5a. Receiving the starting command 8a, the timing device 4 applies a timing signal 7b to the computer 3 through an input device 2b after the prescribed time interval T1. Delay time Ta slightly longer than the time interval T1 is set up in the computer 3, and when a signal 7b is not received within the time Ta after the output of the starting signal 8a, the computer 3 discriminates the malfunction of the timing device 4 and outputs a signal 8b to an alarm 6 through an output device 5b. In the succeeding timing signals 7c, 7d, the same processing is executed. Thus the malfunction of the timing device is simply checked.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to diagnosis of a timing device that uses an electronic computer to detect malfunctions of a timing device that provides control timing from the outside. The method ζ is between the wings.

[Technical background of the invention and its problems]

Electronic computers that control the process (Conventionally, the control timing for two processes was often input sequentially by an operator using pushbutton switches, etc., but recently, timing devices that set predetermined timings have been used, eliminating the need for operator intervention. A method that provides a predetermined control timing is now used.

In this case, the timing device operates automatically, so
If a malfunction occurs, it may cause a serious accident to the process control.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a timing device diagnosing method for diagnosing timing defects in a timing device using an electronic computer to which the timing signal is input.

[Summary of the invention]

The present invention is an electronic computer that inputs timing signals from a timing device and sequentially performs predetermined control operations. ζ This is a diagnostic method that detects that the timing device is not being operated and determines whether the timing device is operating properly.

[Embodiments of the invention]

One embodiment of the present invention is shown in FIG. 1. FIG. 2 is a flowchart showing the diagnostic operation of the computer in FIG. 1.

The operation of FIG. 1 will be explained below with reference to chart 70 of FIG. s2.

When the pushbutton switch 1 is pressed, the timing signal 7a is input to the computer 3 via the input thread t2m.

When the computer 3 receives the timing signal 7&, it gives a timing device 44; a start command 81 via the output device 5a.

Upon receiving the activation command 8a, the timing device 4 gives a timing signal 7b to the computer 3 via the input device 2b after a predetermined time interval Ta.

A delay time Ta that is slightly longer than the predetermined time interval TI is set in the electronic computer 3, and after T& (from the time when the startup command 8a is output), it is checked whether or not the output signal 7b is received.

! If the timing signal 7b is received within the delay time Ta (62), the operation of timing &t4 is as follows: If the timing signal 7b is not received within the delay time Ta (2), the computer 3 It is determined that there is a malfunction in the device 4, and the process control is stopped, and the alarm device it6ζ2 alarm signal 8b is outputted via the output device 5b to give a congratulatory message.

A similar check is performed on the subsequent timing signals 70 and 7d, and when the timing signals are normal, the computer 3 sequentially executes process control (2. When the timing signals are not input at predetermined intervals, The computer 3 stops the process control and issues an alarm via the Il@ device 6.

This makes it possible to detect abnormalities in the timing device 4 and prevent process control accidents due to timing abnormalities.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a method for diagnosing a timing device that uses an electronic computer to detect a malfunction of a timing device that provides control timing from the outside.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart showing its diagnostic operation. 1 Push button switches 21 to 2d Input device 3 Electronic computer 4 Timing device 5m, 5b Output device 6 Information device (8733) Agent Patent attorney Yoshiaki Inomata (and 1 others)
name) 1st m1

Claims (1)

[Scope of Claims] A timing signal from a timing device is input, and the signal (in an electronic computer that sequentially performs predetermined control operations in response to 1=, the above-mentioned tie-setting signal O, each time leap interval-2) corresponds to Set a time interval, and detect if the timing signal is not input within the set time interval (-).
2. Therefore, a method for diagnosing a timing device, characterized in that it discriminates wA11IJfIIt/of the timing device.