JPH02103646A - Monitoring device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a monitoring device that periodically monitors the status of a device.

[Conventional technology]

FIG. 5 is a block diagram showing a part related to recording of status signals of a conventional monitoring device. 3 is a status signal output from the monitored device; 4 is a memory that can be directly accessed by the CPU 1, and stores programs and data for the operation of the CPU 1; 5 is an input state signal table that stores the contents of the state signal 3 taken in by the input state signal table 5, and 6 is the previous input state in which the state signal 3 one cycle before the state signal 3 stored in the input state signal table 5 is stored. Among the signal tables, the input state signal table 5 and the previous input state signal table 6 constitute state change detection means. 7 is a magnetic disk serving as a non-volatile external storage device that records CPUI program files and data files; 8 is a status signal change recording file on the magnetic disk 7 that stores changed status signals and status change times; It is. Next, the operation will be explained with reference to the flowchart shown in FIG. The program according to this flowchart is started at a fixed period (hereinafter referred to as sampling timing). First, the status signal 3 taken in via the input unit 2 is written to the input status signal table 5 on the memory 4 (
Step 5T41). Next, the contents of this input status signal table 5 and the contents of the previous input status signal table 6 are compared (step 5T42), and if they are the same, the process is terminated (step 5T43); if there is a difference, , record the difference in status signal 3 and the current time in the status signal change recording file on the magnetic disk 7. Step 5T44.
), the contents of the previous input status signal table 6 are stored (step 5T45).

[Problem to be solved by the invention]

Since the conventional monitoring device is configured as described above, when the monitoring device is started by turning on the power, etc., the contents of the previous input status signal table 6 in the memory 4 are not set to the correct value, so when starting up, the contents of the previous input status signal table 6 are not set to the correct values. A state change is always detected, a large amount of unnecessary state change information is recorded on the magnetic disk 7, and even if a new state signal change occurs while the monitoring device is stopped, it cannot be detected. There was a problem with it falling off. This invention was made in order to solve the above-mentioned problem, and it provides a monitoring device that can be considered to be continuously monitoring the status signal before stopping and after restarting even if the monitoring device stops. The purpose is to obtain.

[Means to solve the problem]

The monitoring device according to the present invention includes a signal storage unit that captures the status signal of the monitored device and stores it in an external storage device when the operation is stopped, and a status change detection unit that detects the contents stored by the signal storage unit at the time of startup. and signal restoring means for transmitting the signal as a signal for the purpose.

[For use]

The signal restoring means in this invention loads the state signal of the monitored device recorded in the external storage device when the monitoring device was stopped into the state change detecting means on the memory when the monitoring device is activated.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, numerals 1 to 8 are the same as those of the conventional monitoring device shown in FIG. However, the memory 4 or the magnetic disk 7 has additional programs serving as signal storage means and signal restoration means, as shown in the flowcharts shown in FIGS. 2 and 3. 9 is a previous input state signal file that stores the contents of the input state signal table at the time of stop. Next, the operation will be explained with reference to the flowcharts shown in FIGS. 2 and 3. The processing at the normal sampling timing is the same as the conventional case shown in FIG. 6, so the explanation will be omitted. When the monitoring device stops, the CPUI issues a manual request to the input unit 2 even if it is not the sampling timing. The input crab unit 2 inputs the status signal 3 and outputs the CPU
give to The CPUI writes this status signal 3 to the input status signal table 5 (step 5TII), and then
Input status signal table 5 and previous input status signal table 6
The contents are compared with (step 5T12). If the contents are different (step 5T13), the difference in status signals and the current time are recorded in the status signal change record file 8 on the magnetic disk 7.Step 5T14), the previous input status signal table 6 is recorded. After updating the contents of (step 5TI5), the process moves to step (SrI2). If there is no difference in content in step (ST13), the process directly proceeds to step (ST16). After recording the contents of the input status signal table 5 in the previous input status signal file 9 on the magnetic disk 7 in step (ST16), a stop process is executed (step 5T17).
. When the monitoring device starts up, the CPU first reads the contents of the previous input status signal file 9 on the magnetic disk 7, and transfers the read contents, that is, the contents of the input status signal table 5 saved at the time of the previous stop, to the previous input status signal file 9. It is restored to the status signal table 6 (step 5T21). Next, in steps ST22 to ST26, processing at normal sampling timing is executed. Thereafter, the process shown in the flowchart shown in FIG. 6 is performed at each sampling timing. Note that in the above embodiment, the input status signal table 5 is
, the contents of the previous input status signal table 6 are updated with the contents of the input status signal table 5, as shown in the flowchart shown in FIG. (Step S
T35) If the contents of the previous input status signal file 9 are also updated (step ST36), not only the same effect as in the above embodiment can be achieved, but also the monitoring device may suddenly be shut down if the stop processing is not executed for some reason. Even if the system stops, the contents of the previous input status signal table 6 can be correctly restored upon subsequent startup.

【Effect of the invention】

As described above, according to the present invention, the monitoring device is configured such that the signal storage means stores the status signal when the operation is stopped, and the signal restoration device restores the status signal when the operation is started. By continuously monitoring the status signal after restarting, it is possible to prevent unnecessary information from being recorded on the external storage device at the time of restart, and it is also possible to monitor changes in the status signal during the shutdown period. It has the effect of giving you something you won't drop. Furthermore, in order to ensure continuity of monitoring, the memory is not backed up by a battery, but is configured to use a non-volatile external storage device, making it possible to reduce costs without adding extra parts such as batteries. There are some effects that can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of parts related to the invention of a monitoring device according to an embodiment of the present invention, FIG. 2 is a flowchart showing processing when the monitoring device shown in FIG. 1 is stopped, and FIG.
FIG. 4 is a flowchart showing processing at each sampling timing of a monitoring device according to another embodiment of the present invention, and FIG. 5 is a block diagram configuring a part of a conventional monitoring device. FIG. 6 is a flowchart showing the processing of the monitoring device shown in FIG. 1 is a CPU, 2 is an input unit (input unit), 3 is a state signal, 4 is a memory, 5 is an input state signal table (state change detection means), 6 is a previous input state signal table (state change detection means), 7 is a magnetic disk (external storage device). In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant: Mitsubishi Electric Corporation J, lt Figure CPU input unit (input section) figure

Claims (1)

[Claims] an input section for inputting a status signal from a device to be monitored at a constant cycle; a status change detection means for detecting a change in the status of the device from the status signal input to the input section; and a time and a time at which the status changes. In the monitoring device, the monitoring device includes an external storage device that records a changed signal among the status signals, and a signal storage device that stores the status signal of the device when the operation is stopped in the external storage device, and the signal storage device. A monitoring device comprising: signal restoration means for transmitting the contents of the external storage device stored by the external storage device to the state change detection means at the time of startup.