JPH0415849A - Fault alarm informing device - Google Patents

Abstract

PURPOSE:To reduce the wiring quantity of a system itself and to simplify system constitution by providing an alarm output line outputting an alarm when there is abnormality in power circuits or I/O controllers. CONSTITUTION:In a system where the power card of an I/O unit 7 is made redundant, the power circuits 5 have means giving the fault alarm to respective I/O controllers 4 in the unit when the fault occurs in one power circuit. When the fault occurs in one power card, the power card outputs the fault alarm to the alarm output line 9. Respective I/O controllers 4 in the same unit 7 detect the fault alarm and respective controllers 4 inform a main controller 2 of the abnormality of a power source by a transmission line 3. Thus, the detection of the fault in the power card which is made redundant does not require an external processing, system constitution becomes simple and reliability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a failure alarm notification device for a redundant power supply card.

(Prior Art) A main controller, a device (generally a CRT display) that displays various data handled by the main controller, and one or more I/O units connected to a transmission bus from the main controller. In a plant control system consisting of an O controller, a dedicated power supply card within an I/O unit is often made redundant to increase system reliability.

In this case, a function is required to detect and display failures of redundant power supply cards. Otherwise, you would not know if one of the redundant power supply cards fails, so in the worst case scenario, if the other power supply card fails, all I/O controllers in the same unit will fail.
That function will be lost. Therefore, the power supply cart needs a function to feed back and monitor its own output voltage, and when the output voltage falls below a certain determination level, to notify the main controller of a failure alarm and display a message to that effect.

In the conventional system, a power card failure alarm is assigned to the terminal block or connector that connects the input power to the power card, and the failure information of each power card is collected in a dedicated terminal.
Methods such as notifying the main controller or wiring directly to the main controller are used.

(Problems to be Solved by the Invention) According to the prior art, a dedicated terminal block is required to collect the failure alarms of each redundant power supply card, and cables and connectors are also required for wiring the terminal block. becomes.

Therefore, the amount of wiring in the system itself increases.

Moreover, this leads to the complication of the system.

The present invention provides a failure alarm notification device that solves these problems.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a transmission line drawn out from a main control circuit, a plurality of I/O units connected to this transmission line, and a plurality of I/O units connected to this transmission line.
The I/O controller that configures the unit and mounts the I/O control card;
This failure alarm notification device includes a power supply circuit that inputs and outputs power for the O unit, and an alarm output line that outputs an abnormality in the power supply circuit or the machine/O controller.

(Function) The failure alarm of the power supply card is output as a contact, open collector, or logic level. This output is output on the motherboard in the work/O unit, and this failure alarm is assigned to the symbol with the jack connector of each slot. And also,
The 1/O controller reads the signal assigned to this jack connector as a status.

(Example) Next, an example of the present invention will be described. FIG. 1 shows a transmission line 3 drawn out from the main controller 2, a plurality of I/O units 7 connected to the transmission line 3, and an I/O unit that constitutes the I/O unit 7 and has an I/O control card mounted thereon. /
Built-in I/O controller 4 and I/O unit 7
A failure alarm notification device is shown that includes a power supply circuit 5 that inputs and outputs power for the O unit, and an alarm output line 9 that outputs an abnormality in the power supply circuit 5 or the I/O controller 4.

That is, a main controller 2, a CRT display device 1 that displays its various data, and a plurality of I/O units that can be mounted with a plurality of I/O control cards connected to a transmission line 3 extending from the main controller 2. In a control system consisting of the unit 7, or in a system in which the power supply cart for the I/O unit 7 is redundant, if a failure occurs in one of the power supply cards, a failure alarm is sent to each I/O unit in the unit. The figure shows a control system device consisting of a power supply circuit 5 having means for notifying the O controller 4, and an I/O controller having means for reading the failure alarm from the motherboard, and the I/O unit includes a power supply card. has been made redundant. This power supply card monitors its own output voltage, and when the output voltage reaches a certain determination level, it outputs a failure alarm to the motherboard in the I/O unit. Each I/O unit
The /O controller 4 constantly monitors this signal at regular intervals as a power failure alarm status.

If a failure occurs in either of the redundant power supply cards, the power supply cart outputs a failure alarm. Each I/O controller 4 in the same unit detects this failure alarm, and each controller receives the main controller 2.
Notifies the power supply abnormality by transmission.

The main controller 2 receives all these power failures. The main controller 2 performs an OR logic on the power supply abnormality data, combines them into one, and displays this on the CR1 display device 1.

〔Effect of the invention〕

According to the present invention, failure detection of redundant power supply cards can be performed by
No external treatment is required, resulting in a very simple system configuration and improved reliability.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a failure alarm notification device showing an embodiment of the present invention. 1... CRT display device 2... Main controller 3... Transmission line 4... I/O controller 5... Power supply circuit 7... I/O unit

Claims (1)

[Claims] A transmission line drawn out from the main control circuit, a plurality of I/O units connected to this transmission line, an I/O controller that configures this I/O unit and mounts an I/O control card, and Built into the I/O unit, the I/O
A failure alarm notification device comprising a power supply circuit that inputs and outputs power for an O unit, and an alarm output line that outputs an abnormality of the power supply circuit or the I/O controller.