JP2581295B2 - Incorrect mounting detection structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erroneous mounting detection structure for detecting erroneous mounting of a substrate in an apparatus on which a large number of substrates are mounted.

[Prior Art] FIG. 2 shows a conventional example of this type. In the figure, packages 4, 5, and 6 are different types of packages, and are mounted at unique slot positions. The power and ground terminal positions of each package are common regardless of the type of the package. A loop 1 is provided in the internal circuit of the package.

One of the two terminals constituting this loop is connected to the ground in the backboard 2,
The other is connected to the control unit 3 in parallel. Although the positions of these two terminals (ground input terminals) are changed for each group of a plurality of substrates, they are common in a group of the same substrate regardless of the type of package.

Under the above configuration, when the same group of packages is mounted, the parallel signal 7 to the control unit goes to the ground level, so that the control unit recognizes the mounting of this package, but another group of substrates is mounted. Then, since the parallel signal 7 does not reach the ground level, erroneous mounting can be recognized.

[Problems to be Solved by the Invention] However, in such a conventional device, since the ground input terminals constituting the loop 1 are common regardless of the package, the package 5 is erroneously mounted at the mounting position of the package 4, for example. However, the control signal cannot recognize the erroneous mounting, and the control unit 3 recognizes that the package 4 is mounted, and may perform erroneous processing (unnecessary control, unnecessary alarm transmission, and the like). Was. In addition, there is a problem that erroneous mounting cannot be notified to the outside of the device.

Means for Solving the Problems The present invention provides a set of two terminals provided at a unique position for each type of package and forming a loop, a plurality of sets of two terminals not forming a loop, A package is provided with an AND circuit connected to one terminal of each set of terminals not forming a loop, and a lamp connected to an output terminal of the AND circuit. When each package is inserted in the correct position in the device, the monitoring device detects the ground through a set of terminals forming a loop, and the lamp is lit when each package is inserted in the wrong position in the device. Is what you do.

[Operation] If a different board is mounted, no ground signal is sent out, and it can be determined that the board is erroneously mounted or not mounted.

Embodiment FIG. 1 is a circuit diagram showing an embodiment of the present invention. The position of a ground input terminal forming a loop 1 for notifying a control unit 3 of the mounting of packages 4 to 6 is determined. It is unique for each type. In addition, of the terminals used as ground input terminals in other types of packages, the terminal connected to the ground on the backboard 2 is used to notify the erroneous mounting composed of the AND gate 8 and the lamp 9. The circuit 10 is provided in a package.

When the packages 4 to 6 are mounted in correct positions based on the above configuration, the parallel signal 7 transmitted to the control unit 3 through the back board 2 becomes the ground level, and the mounting of each package is recognized by the control unit 3. You.

Next, when the package is mounted in the wrong position, the parallel signal to the control unit 3 does not reach the ground level, so the control unit 3 recognizes that the package at the position where the package is erroneously mounted is not mounted. Therefore, it is possible to prevent the control unit 3 from performing unnecessary control on the package and issuing an unnecessary alarm about a failure in the apparatus caused by the control or erroneous mounting of the package. Further, when the package is erroneously mounted, the lamp 9 is turned on by the erroneous mounting notification circuit 10 to notify the erroneous mounting to the outside.

[Effects of the Invention] As described above, the structure of the present invention makes the ground input terminal for notifying the control unit of the package mounting unique to each package type, so that when the package is erroneously mounted. This has the effect of preventing the control unit from performing erroneous processing.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional structure. 1 ... loop, 2 ... backboard, 3 ... control unit, 4
-6: package, 7: parallel signal, 8: AND circuit, 9: lamp, 10: erroneous mounting notification circuit.

Claims (1)

(57) [Claims] In an erroneous mounting monitoring structure in which ground is sent to a monitoring device via an internal loop of a package inserted into a device, a loop is provided at a unique position for each type of package. One set of two terminals, a plurality of sets of two terminals not forming a loop, an AND circuit connected to one terminal of each set of terminals not forming the loop, and an output terminal of the AND circuit. And a package provided with a lamp, and when each package is inserted into the correct position in the device, the monitoring device detects the ground through a set of terminals forming a loop, and each package is placed in the wrong position in the device. An erroneous mounting detection structure characterized in that a lamp is turned on when inserted.