JP2998802B2 - Mistake removal prevention system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 【Overview】

The present invention relates to an erroneous removal prevention system, which aims at facilitating confirmation of a part to be replaced by an operator and taking an aggressive measure to prevent erroneous removal. A plurality of functional blocks provided with engaging holes for engaging a drawing tool, and connected to the engaging holes via FG patterns wired to the respective functional blocks, and an abnormality in the functional blocks from the arithmetic processing unit. A switch circuit that switches to the OFF state when a signal is output, and is connected to the FG pattern of each functional block via the switch circuit, and when the input / output terminal voltage from the switch circuit goes to ground level, an alarm sound or light And an alarm unit that generates an alarm when a drawer tool is engaged with the engagement hole of the normal function block and the engagement hole and the housing are short-circuited. To configure.

[Industrial applications]

The present invention relates to an erroneous removal prevention system. Fault-tolerant computers, etc.
2. Description of the Related Art A highly reliable system is used in which important functional units are multiplexed in a system and components can be replaced and maintenance can be performed without stopping operation of the system. During hot-maintenance during operation, the highest attention is required for the replacement of parts. Workers are overwhelmed or accidentally removed.
There was a possibility that it would cause secondary disability. For this reason, there has been a demand for the development of a highly maintainable system while maintaining high reliability.

[Prior art]

Conventionally, in hot maintenance that continues to operate the entire device, the failed board is removed and replaced.
At that time, the following structure was adopted to prevent a normal substrate from being accidentally extracted. In other words, regarding the accidental removal prevention,
Regarding which part (board) is the target of work,
The display on the front panel or the failure board itself has a light emitting display function.

[Problems to be solved by the invention]

However, in the conventional system for preventing erroneous removal, it takes time for the operator to check the coincidence between the displayed portion and the failed portion, and the erroneous removal of the normal portion (substrate) is not noticed. And could cause more serious disability. The present invention has been made in order to eliminate the above-mentioned drawbacks, and provides an erroneous removal prevention system that facilitates confirmation of a replacement target portion by an operator and takes an aggressive measure to prevent erroneous removal. It is intended to be.

[Means for Solving the Problems]

The present invention will be described with reference to FIGS. 1 and 2. In an information processing apparatus having a plurality of functional blocks 3 connected by an arithmetic processing unit 8 and a bus circuit 9, the information processing apparatus includes: 15, 16, 17 that senses the alarm and the alarm 14 that can generate alarm sound and light
And the alarm unit 14 according to a command from the arithmetic processing unit 8.
Switch circuit for selectively setting the alarm transmission / release state
13 and.

[Action]

If the functional block 3 is normal, the processing unit 8 closes the switch circuit 13 and sets the alarm unit to a state in which an alarm can be transmitted. If the operator accidentally approaches or touches the normal function block 3 for replacement, the sensor unit (15, 16, 17)
Is transmitted to the alarm unit 14, and the buzzer sound and light flash. Thereby, the worker notices the erroneous removal and the replacement is prevented beforehand. If a failure has occurred in the functional block 3, the arithmetic processing unit 8 closes the switch circuit 13 (off).
The alarm unit 14 is set to the alarm release state. The operator can replace the faulty block accurately.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a printed circuit board 3 of a component is held on a metal housing 1 via an insulating rail 2. The printed circuit board 3 is connected to the bus function collective board 5 via the connector 4, and similarly, a large number of other boards having other functions are provided in the housing 1. It is a block. Thus, a spare board 7 is provided in the housing 1 in the same structure as described above, and when the printed board 3 fails, the spare board 7 is switched to take over the operation instead. The CPU 8 of the arithmetic processing unit controls the board 3 and the spare board 7, which are connected to each other by a bus circuit 9. The bus circuit 9 is substantially connected to each of the boards 3 and the spare board 7 via the bus function collecting function 5 and the connector 4, and the bus circuit 9 is logically selectively connected to the boards 3 and 7 by the bus control line 10. Connected to. The CPU 8 includes a failure determination logic unit 11 for each board 3, and outputs a coping signal via the bus control line 10 when each board 3 has a functional abnormality. A replacement target display section 12, a switch circuit 13, a buzzer alarm, and an alarm section 14 for emitting flashing light are provided at corresponding positions on each printed circuit board 3. The switch circuit 13 is opened / closed by an output signal of the bus control line 10 and when closed (ON), the alarm unit 14 is set to a standby state for alarm transmission, and opened (OFF).
At the time of alarm 14 is deactivated. Now, a pair of engaging holes (land pattern through holes) are formed in the printed circuit board 3 as a sensor unit for detecting approach or contact.
15 and a pair of wiring patterns 16 are formed.
The pulling tool 17 is removably engaged with the pulley. The pair of engagement holes 15 are exposed land pattern through holes formed near the upper and lower ends of the front surface of the printed circuit board 3. One end of each wiring pattern 16 is connected to the engagement hole 15. I have. The other end of each wiring pattern 16 is connected to one end of the switch circuit 13 via the connector 4. The housing 1 is connected to a frame ground (FG) at each of the upper and lower ends, and the shield side of the alarm unit 14 is also connected to the FG. On the other hand, the spare board 7 is provided with a switching display section 20, which is controlled by the bus control line 10, and the spare board 7 is provided so as to be logically connectable to the bus line 9. Next, the operation of the erroneous removal prevention system having the above configuration will be described with reference to the flowchart of FIG. First, the CPU 8 constantly monitors the normality of all the boards 3 in the system even during the execution of the data processing.
It has done a failure diagnosis of S _1. A fault in any of the substrate 3 in the step S ₂ is generated, the failure displayed in step S _3. In FIG. 1, the printed circuit board 3 in which the logic unit 11 of the CPU 8 has a failure is logically separated from the bus circuit 9 via the bus control line 10. At this time, the signal of the bus control line 10 to the switch circuit 13 in step S ₄ with lighting the light to the failure display unit 12 in an open (off) state. At the same time, the logic section 11 logically connects the spare board 7 to the bus circuit 9 and turns on the switching display section 20. Therefore, even if a failure has occurred in one printed circuit board 3, the entire system can continue processing by switching to the substitute spare board 7. Operator in step S ₅ confirms the failure location in the lighting of the fault indication unit 12 performs replacement of the defective substrate 3 in step S _6. While for normal printed board 3, the switching circuit 13 in step S ₁₀ since no signal from the bus control line 10 is not dispatched in a state of normally closed (ON). Then step S ₆
Proceeds incorrectly worker during replacement of the substrate 3 in step S ₁₁ when you try removed by mistake a normal printed circuit board 3, the alarm unit 14 is activated, it sounds an alarm buzzer, light flashes. As a result, the operator notices that he or she was trying to unplug the normal printed circuit board 3 by mistake, and the unplugging is prevented. This is shown in FIG.
When the tool 17 is engaged and rotated, the end of the tool 17 comes into contact with the housing 1 and FG → housing 1 → tool 17 → wiring pattern 16 → connector 4 → switch circuit 13 → ground to the alarm circuit 14. This is because a circuit is formed. Operator who has noticed misrecognition continue to work in step S _12, and re-check the failure point returns to step S _5, or immediately accurately removing the substrate 3 of the fault point at step S _7. And a new board 3 Insert exchange in step S _8, step
Logic unit 11 in S ₉ enters the reset state. After the replacement of the new component, that is, the board 3, the role of the spare board 7 ends, and the logic unit 11 switches the bus circuit 9 to the original printed board 3. In this way, the occurrence of a work error is prevented beforehand, and the reliability of the system is greatly improved. Note that the erroneous removal sensor is not limited to the FG short circuit by the tool 17, and may use a proximity sensor or a touch sensor.

【The invention's effect】

As described above, according to the present invention, the alarm is activated for the normal part and the proximity sensor is provided. Therefore, when the worker approaches the normal part for removal by misidentification or comes into contact with the normal part, a warning is issued by the alarm. Can occur. It is possible to improve from a passive situation, which relied on careful confirmation of the operator, to a positive system for notifying an erroneous operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an erroneous removal prevention system of the present invention, and FIG. 2 is a flowchart showing the operation of the present invention. In the figure, 1 is a housing, 2 is an insulating rail, 3 is a printed board, 4 is a connector, 5 is a bus function assembly board, 7 is a spare board, 8 is a CPU, 9 is a bus circuit, 10 is a bus control line, and 11 is a bus control line. Logic section, 12 is a failure display section, 13 is a switch circuit, 14 is an alarm section, 16 is a wiring pattern, 17 is a drawing tool, and 20 is a switching display section.

Claims (1)

(57) [Claims] 1. A plurality of functional blocks (3,...) Housed in a housing (1) and provided with engaging holes (15) for engaging a drawing tool (17) made of a conductive material; Connected to the engaging hole (15) via the FG pattern (16) wired to the functional block (3), and when an abnormal signal of the functional block (3) is output from the arithmetic processing unit (8) A switch circuit (13) that shifts to an OFF state, and an alarm unit (14) that is connected to the switch circuit (13) and generates an audible alarm or light when the input / output terminal voltage from the switch circuit (13) becomes the ground level. ), When the extraction tool (17) is engaged with the engagement hole (15) of the normal function block (3) and the engagement hole (15) and the housing (1) are short-circuited. , An accidental removal prevention system that activates the alarm unit (14).