JPH05243764A - Mounting error prevention device - Google Patents

Abstract

PURPOSE:To prevent operation error and defects by providing a second means which, when a first means detects inconsistance, stops outputting information transfer signal to a back wiring board, in response to the signal coming from the first means. CONSTITUTION:If a plug-in package 2 is inserted into a wrong mounting position when it is inserted into a back wiring board 1, a tri-state buffer 21, if the signal indicating mounting error is inputted into a disable terminal from a comparisor circuit 20 through a signal line e, makes an output into a suspension state (high impedence). Therefore, the information transfer signal inputted through a signal line c is not outputted to a signal line d, and so, the information transfer signal from the plug-in package 2 is not transferred to the back wiring board 1. As a result, collision with the outputs from respective plug-in packages is avoided, so occurrence of malfunction or defect is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incorrect mounting protection device,
In particular, the present invention relates to an erroneous mounting protection device when a plug-in package is plugged into a back wiring board for use in a digital telecommunications device.

[0002]

2. Description of the Related Art Referring to FIG. 2, in order to detect erroneous mounting, a back wiring board 3 and a back wiring board 3 are mounted on the back wiring board 3 and a signal bus (not shown) in the back wiring board 3 is used. A plurality of plug-in packages 4 for transmitting / receiving signals to / from other plug-in packages (not shown) connected to the back wiring board 3 are provided. Here, one plug-in package 4 is shown as a representative. More specifically, when the plug-in package 4 is plug-in mounted on the back wiring board 3, the back wiring board 3 supplies a package type designation signal to the plug-in package 4 via the signal line f, and the comparison circuit 40 Is input to one of the input sections. A package type identification signal for recognizing the type of its own package is input to the other input section of the comparison circuit 40 from another circuit (not shown) in the plug-in package 4 via the signal line g. The comparison circuit 40 compares the signal pattern of the package type designation signal with the signal pattern of the package type identification signal to determine a match / mismatch, and when detecting the mismatch, outputs a signal indicating the mismatch via the signal line m. That is, the fact that the plugged-in position of the plug-in package 4 is wrong is notified. Here, the package type identification signal is a pattern code given in advance so that several types of packages having different functions can be identified, and is different for each package. Further, the package type designation signal has a pattern code defined in advance for each mounting position corresponding to some mounting positions on the back wiring board 3, and varies depending on the mounting positions. In addition, the plug-in package 4 has a drive buffer 41 at the output section.
And outputs an information transmission signal input from another circuit (not shown) in the plug-in package 4 through the signal line h to the signal line k through the drive buffer 41, and a signal bus in the back wiring board 3 Via the back wiring board 3 to each of the other plug-in packages mounted on the back wiring board 3.

[0003]

When a plurality of plug-in packages 4 having different functions are plug-in mounted on the back wiring board 3, generally, the plug-in positions of the respective plug-in packages 4 are different from each other. It is predetermined and is used by being plugged in at each designated position. Further, in a digital telecommunications device, when a plurality of plug-in packages 4 having different functions are used by being plug-in mounted on a common back wiring board 3, when signals are transmitted and received between the plurality of plug-in packages 4. In general, the signal lines used share a signal bus in the back wiring board 3, and information transmission signals are mutually transmitted and received according to a predetermined transmission procedure. When the plug-in package 4 used in such a state is plugged into the back wiring board 3 and the plug-in package 4 is plugged in at a different position due to a wrong mounting position, the comparison circuit 40 determines that the plug-in package 4 is wrong. Signal line m to inform that the plug-in
However, this signal is only used for alarm display or alarm recording. Therefore, since the information transfer signal is sent from the drive buffer 41 to the signal bus in the back wiring board 3 via the signal line k, it collides with the information signal from another plug-in package which is being output to the signal bus at that time. It is unavoidable that malfunctions or failures of mutual packages or the entire system will occur.

[0004]

An erroneous mounting protection device according to the present invention mounts a plurality of plug-in packages, outputs a type designation signal designating a package type to each of the plug-in packages, and outputs the type designation signal of the plug-in package. Each of the plug-in packages includes a back wiring board that receives an information transfer signal from each of the plug-in packages and transfers the information to each of the plug-in packages, and each of the plug-in packages includes a type identification signal and a type identification signal for identifying its own package type. Is input to detect the coincidence state with the type designation signal, and the back wiring board in response to the signal input from the first means when the first means detects a mismatch. Second means for stopping the output of the information transmission signal to the.

[0005]

The present invention will be described below with reference to the drawings. Referring to FIG. 1 showing an embodiment of the present invention, a back wiring board 1 and a signal bus (not shown) in the back wiring board 1 which are respectively mounted on the back wiring board 1 are provided for protection against erroneous mounting. A plurality of plug-in packages 2 for transmitting / receiving signals to / from other plug-in packages (not shown) connected to the back wiring board 1 via the back wiring board 1 are provided. here,
One plug-in package 2 is illustrated as a representative. When multiple plug-in packages with different functions are plugged into the back wiring board, the plug-in position of each plug-in package is generally determined in advance, and Used by being plugged in. In addition, when using multiple plug-in packages with different functions in a digital telecommunications device by mounting them on a common back wiring board, the signal lines used for transmitting and receiving signals between the multiple plug-in packages. In general, the signal bus in the back wiring board is shared, and information transmission signals are mutually transmitted and received according to a predetermined transmission procedure. When the plug-in package 2 is plug-in mounted on the back wiring board 1, the back wiring board 1 sends a signal line a to the plug-in package 2.
A package type designation signal is supplied via the comparator circuit 2
0 is input to one input unit. A package type identification signal for recognizing the type of its own package is input to the other input section of the comparison circuit 20 from another circuit (not shown) in the plug-in package 2 via the signal line b. The comparison circuit 20 compares the signal pattern of the package type designation signal with the signal pattern of the package type identification signal to determine a match / mismatch, and when a mismatch is detected, a signal indicating the mismatch via the signal line e, that is, a plug-in package. A signal indicating that the mounted position of 2 is wrong is output to the tri-state buffer 21. Here, the package type identification signal is a pattern code given in advance for each package so that several types of plug-in packages 2 having different functions can be identified, and is different for each package. Further, the package type designation signal has a pattern code defined in advance for each mounting position corresponding to several mounting positions on the back wiring board 1, and varies depending on the mounting positions. In addition, the plug-in package 2 has a tri-state buffer 2 at the output section.
1 and normally outputs an information transmission signal input from another circuit (not shown) in the plug-in package 2 through the signal line c to the signal line d through the tri-state buffer 21. It is transmitted to each of the other plug-in packages mounted on the back wiring board 1 via the signal bus inside. Here, when the plug-in package 2 is plugged into the back wiring board 1 and the plug-in package 2 is plugged into another position by mistake in the mounting position, the comparison circuit 20 determines that the plug-in package 2 is mounted in the wrong position. A signal indicating that is output to the signal line e. When a signal indicating erroneous mounting is input to the disable terminal A from the comparison circuit 20 via the signal line e, the tri-state buffer 21 puts the output in a stopped state (that is, high impedance). Therefore, the information transmission signal input through the signal line c is not output to the signal line d,
The information transmission signal from the plug-in package 2 is not transmitted to the back wiring board 1. Therefore, the erroneously mounted plug-in package 2 can be prevented from affecting the surrounding electrical condition, and the plug-in package 2 from each of the other plug-in packages connected to the same signal bus in the back wiring board 1 can be prevented. Since it is possible to avoid the collision with the output of the plug-in package 4, it is possible to prevent the malfunction or failure of the plug-in package 4 or the entire system that mutually transmits and receives the information transmission signal.

[0006]

As described above, according to the present invention,
Even when the plug-in package is plugged into the back wiring board by mistake in the mounting position, it is possible to avoid a collision with the output signal from another plug-in package. As a result, malfunctions and failures can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing an erroneous mounting protection device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an erroneous mounting protection system of a conventional example.

[Explanation of symbols]

 1 back wiring board 2 plug-in package 20 comparison circuit 21 tri-state buffer A disable terminal a, b, c, d, e signal line

Claims (1)

[Claims] 1. A plug-in that mounts a plurality of plug-in packages, outputs a type designation signal for designating a package type to each of the plug-in packages, and receives an information transmission signal from each of the plug-in packages. Each of the plug-in packages is provided with a back wiring board for transmitting to each of the packages, and each of the plug-in packages receives the type designation signal and a type identification signal for identifying its own package type, and detects a coincidence state with the type designation signal. And a second means for stopping the output of the information transmission signal to the back wiring board in response to the signal input from the first means when the first means detects a mismatch. An erroneous mounting protection device comprising: