JPH03292501A - Power unit for programmable controller - Google Patents

Abstract

PURPOSE:To previously know a system stop and to easily study the cause of the system stop by providing a pre-alarm function to previously detect the DC output down and to produce an alarm and displaying the DC output down by a display device which shows the input/output down. CONSTITUTION:A power unit 1 detects an output current by a through-current detection means contained at the output side of the unit 1. Then the unit 1 outputs an alarm signal at 100%-120% rated output current. Thus an alarm LED 8 provided on the surface of the unit 1 blinks to warn that a system stop may occur by a through-current higher than the 100%-120% rated current level. Furthermore, a sudden system stop can be prevented with use of the pre-alarm signal. Thus the through-load of the output side is previously detected by a pre-alarm function. As a result, the system stop can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply unit device for a programmable controller.

[Prior Art] Figure 3 shows an example of the system configuration of a conventional programmable controller. In the figure, (1) is a power supply unit, (2) is a CPU unit, (3) is an input unit,
(4) is a crab unit, (5) is a special unit, (6)
indicates the base unit, and (7) indicates the POWERLED.

In the above configuration, the power supply unit (1) c, as shown in FIG.
It is converted to DC by C/formula-ta, and the CPU unit (2
), input crab unit (3), output crab unit (4), special unit (5), etc. are supplied with DC current, and the CPU unit (2), input crab unit (3), output crab unit (
4) and the special unit (5), etc., the system was operated by detecting that the total of the seven current values used in the power supply unit (1) was less than the rated output current capacity of the power supply unit (1).

And the CPU unit (2) and crab knit (3)
When the current capacity consumed by the output unit (4), special unit (5), etc. exceeds the rated capacity of the power supply unit (1), an overcurrent detection means (not shown) detects this and reduces the DC output. Stop the system operation, and turn off the POWERLE on the front of the power supply unit (1).
D (7) was turned off. In addition, when the AC input voltage falls below the specified voltage, this is detected by an AC voltage detection means (not shown), and the AC input is lowered to stop the system operation.
ERLED (7) was turned off.

[Problem to be solved by the invention]

The conventional power supply unit device is configured as described above, so the CPU unit (2), the human crab unit (3)
There was a problem in that the system suddenly stopped when the current value consumed by the output unit (4), the special unit (5), etc. exceeded the rated capacity of the power supply unit (1).

Furthermore, the system also stops when the AC input voltage drops, and since there is only one display device, the POWERLED (7), there is a problem that it takes time to investigate the cause of the system stoppage and restore it.

Furthermore, Japanese Patent Application Laid-Open No. 82-154101 discloses a technique for cutting off the power supply by varying the overcurrent setting value according to the load circuit of the programmable controller.
It was not possible to predict and deal with system outages due to overload in advance. In addition, Japanese Patent Laid-Open No. 81-257090 discloses a technology that displays the operating status of each device with blinking LEDs, but by simply displaying the ON and OFF status, system stoppage due to overload can be prevented in advance. could not be displayed.

This invention was made to solve the above-mentioned problems, and makes it possible to predict and deal with system stoppages due to overcurrent in advance, and also makes it easier to investigate the cause of system stoppages when the system stops. The object is to obtain a power supply unit device for a programmable controller.

[Means to solve the problem]

A power supply unit device for a programmable controller according to the present invention is a power supply unit device for a programmable controller that operates an electronic circuit by inputting alternating current from the outside and outputting direct current. It is equipped with a pre-alarm function that issues an alarm.

(Operation) In the present invention, a system stop can be prevented in advance by detecting an overload on the output side in advance using the pre-alarm function and taking appropriate measures.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is a system configuration diagram of a programmable controller, and the same parts as in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, (8) indicates an alarm LEI whose lighting is controlled based on the control of the power supply unit (1);
RLE;l) (7) and is controlled according to the flowchart shown in FIG.

That is, FIG. 2 shows a control system diagram of the power supply unit (1), and the operation will be explained below with reference to this.

When AC is input to the power supply unit (1), the input voltage is detected by the AC voltage detection means (not shown) built into the power supply unit (1).521.522) If the input voltage is within the specified voltage range (S23), the power supply The AC/DCC/type controller (not shown) built into the unit (1) outputs DC and lights up the POWERLED (7) (S2
5) If the input terminal is smaller or larger than the specified input terminal (523),
By outputting an alarm signal and turning off the POWERLED (7) (524), it is possible to know that the AC input is not being supplied or that the system has stopped due to a drop in the input terminal during system operation.

In addition, the power supply unit (1) has a CP as shown in FIG.
U unit (2), crowded crab unit (3), (4)
It supplies direct current to the special unit (5), etc., detects the output current with a built-in overcurrent detection means on the output side (not shown), and outputs a pre-alarm signal at 100% to 120% of the rated output current, Make the alarm LED (8) on the surface of the power supply unit (1) blink (525-528).

The alarm LED (8) flashes to warn you in advance that the system will stop due to overcurrent if any more current flows, and by using a pre-alarm signal, it is possible to prevent a sudden system stop. .

On the other hand, by issuing an alarm signal at 120% or more of the rated output current and lighting up the alarm LED (8) (S29), it is possible to know that the system has stopped due to an overcurrent on the output side.

Note that when the current is less than 100% of the rated output current, that current is output as is.

In the above embodiment, a case has been described in which the output current is detected and a pre-alarm output is performed, but the output voltage may also be detected, and the same effects as in the above embodiment can be obtained.

(Effects of the Invention) As described above, according to the present invention, a system stop is prevented by detecting a DC output down in advance and having a pre-alarm function to issue an alarm and displaying the input/output down on a display device. Not only can this be known in advance, but it also has the effect of making it easier to investigate the cause of a system outage.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of a programmable controller according to an embodiment of the present invention, Fig. 2 is a control flowchart of a power supply unit, Fig. 3 is a system configuration diagram of a conventional programmable controller, and Fig. 4 is a system configuration diagram of a programmable controller unit. It is a power supply system diagram. In the figure, (1) is the power supply unit, (2) is the CPU unit, (3) is the input crab unit, (4) is the output crab unit, (5) is the special unit, (6) is the base unit, (
7) is POWERLE[l, (8) is an alarm LED. In addition, in the figures, the same reference numerals refer to the same or corresponding parts as shown in the attached sheet. 7. Catalog of attached documents (self-motivated) June 1, 1990, Indication of the case Patent application No. 95658/1990 Name of the invention Person who amends power supply unit device for programmable controller Relationship to the case Patent applicant Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo
Name (601) Moriya Shiki, Representative of Mitsubishi Electric Corporation

Claims (1)

[Claims] A power supply unit device for a programmable controller that operates an electronic circuit by inputting AC from the outside and outputting DC, is characterized by a pre-alarm function that detects system stoppage due to overload in advance and issues an alarm. A power supply unit device for programmable mat rollers.