JPS61227000A - Controller with substrate module misinsertion preventing function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a control device in which a plurality of board modules are housed in a control unit, and particularly to a control device having a function of preventing incorrect insertion of each board module into the control unit. Regarding equipment.

[Technical background of the invention and its problems]

In general, in a control device that includes multiple board modules (printed wiring boards) inserted and housed in a control unit, the functions of each board module are combined by interconnecting each board module with wiring or a backboard. This enables it to perform its original control function as a control device.

Therefore, in order for the control device to function properly, each board module must be connected correctly to each other, and for this purpose each board module must be placed in its proper position, which is predetermined by the control unit's wiring and backboard. It must be inserted and fixed without any problem. However, for inspection and maintenance of this type of control device, there are many occasions when the board module is removed from the control unit during testing, etc., and it is reassembled each time. The unit may be inserted in the wrong position, and in such an incorrectly inserted state, the control device will not function properly, and the wrong signal voltage will be applied to the input/output section of the incorrectly inserted board module. This may cause damage to the elements within the substrate module.

Therefore, in the past, as a measure to prevent incorrect insertion of a board module, a keyway 3 is formed at a unique position that differs for each board module in the connector connection part 2 of a board module 1, as shown in FIG. Each connector 5 provided on the chassis 4, which is the backboard on the control unit side, is provided with a key 6 that can fit into the keyway 3 of the connector connection part 2 only when the correct board module 1 is inserted. It is designed to prevent insertion.

However, in this method of preventing erroneous insertion using the keyway 3 and the key 6, there is a problem that as the board module 1 is repeatedly inserted and removed, the key may fall off, making it impossible to obtain the function of preventing erroneous insertion. In addition, the key groove 3 of each board module 1 is formed during the board outline processing during board manufacture.
Later, it is difficult to change the position of the keyway 3, and even if the same board is used, a board module with different functions may be obtained depending on internal memory, jumper wire connections, element mounting, etc. However, there was a problem in that it was impossible to position the key grooves of each board module at different positions.

In addition, as another method, as shown in FIG. 3, marks 7 are attached with paint or the like on the side surface of the opposite connector connection part of each board module 1 at different positions, and the arrangement of the marks 7 is visually observed. Misinsertion is prevented by checking whether each board module 1 is inserted in the correct position.

However, in this method of preventing erroneous insertion using the mark 7, visual confirmation becomes difficult due to staining or peeling of the mark 7, or illumination conditions, and the effect of preventing erroneous insertion is significantly reduced. Furthermore, if the insertion positions of the lower board modules are not equidistant, or if there are spare board module insertion positions, it is difficult to confirm using the mark 7, and there is a problem in that no erroneous insertion effect can be expected.

[Purpose of the invention]

This invention has been made in view of the above circumstances, and aims to provide a very simple control device that can satisfactorily solve all of the conventional problems described above and can reliably prevent incorrect insertion of each board module. purpose.

[Summary of the invention]

In order to achieve the above object, the control device with the function of preventing incorrect insertion of a board module of the present invention has a plurality of board modules arranged on the front and back surfaces of each connector connection part of a plurality of board modules housed in a control unit, and in pairs with each other on the front and back sides. Among the many pairs of front and back connecting conductors that are electrically connected to each other, a pair of front and back connecting conductors at different specific positions for each board module is electrically disconnected from each other and used as an alignment key, while each board A board module that detects incorrect insertion when the connector side of the module is connected to the front and back connection conductors other than the above-mentioned front and back alignment keys on the connector side into which it is fitted, preventing power supply to the control unit and warning of incorrect board module insertion. An erroneous insertion detector is provided to electrically and reliably detect erroneous insertion of each board module, thereby increasing the effect of preventing erroneous insertion.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. In the figure, 11 is a board module inserted into the control unit, 12 is a power supply for the control unit, 13 is a power switch, and 14 is a power line that supplies power to each board module 11 when the power switch 13 is turned on. . Here, each of the board modules 11 has connection conductors 118. on the front and back surfaces of the connector connection part, in order to prevent poor contact between the connection conductors (conductor foil) arranged in large numbers at the connector connection part and the respective connection terminals of the connector, as in the conventional case. 11b are arranged and are electrically connected to each other in pairs on the front and back sides.

6- Among the many pairs of front and back connecting conductors 11a and 11b of the connector connection portion of each board module 11, a pair of front and back connecting conductors at different unique positions for each board module 11 is aligned by cutting off electrical connection with each other. Keys 11C, 11d
Toshiru.

On the other hand, on the connector side of the backboard of the control unit into which the connector connection portions of each board module 11 are fitted, connection terminals (not shown) are provided for connecting to the multiple pairs of front and back connection conductors 11a and 11b. At the same time, detection lines 15 each consisting of a pair of detection terminal wires 158, 15b are provided, positioned corresponding to the insertion position of each board module 11 predetermined by the backboard or wiring, and each pair of detection terminal wires 158, 15b Terminal wire for detection 15
For the board module 11 (the one shown other than the third from the outside in FIG. 1) in which the board modules a and 15b are correctly inserted, the positioning keys 11c are cut off from electrical connection on the front and back sides.
, 11d, and the alignment key 11a for the incorrectly inserted board module 11 as shown in the third from the left above.

11b, but are connected to the front and back connecting conductors 11a and 11b, which form a pair and are electrically connected. An erroneous insertion detector 16 is provided connected to the detection line 15.

This incorrect insertion detector 16 detects whether the electrical circuit of each detection line 15 is open or closed and determines whether the insertion position of each board module 11 is correct or incorrect. The power switch 13 is turned on via the switch command line 17, and conversely, when incorrect insertion is determined, the switch ON command is not generated, the power switch 13 is kept in the OFF state, and a warning signal is sent to the incorrect insertion warning section 18. is output to issue an incorrect insertion warning sound or turn on a lamp to display an incorrect insertion warning. Note that 19 is a power line to the erroneous insertion detector 16.

In the above-described configuration, when all the board modules 11 are inserted into the correct positions of the control unit, the front and back alignment keys 11c and 11d cut off the electrical connection of the connector connection parts of the board modules 11 to each other. By connecting the detection terminal wires 15a and 15b of the detection lines 15 to the terminal lines 15a and 15b, the electrical circuits of all the detection lines 15 remain open.

When the incorrect insertion detector 16 electrically detects this, it is determined that all the board modules 11 have been correctly inserted, and the power switch 13 is turned on via the switch command line 17 to control the control unit 1. The normal control function is activated by supplying power to the

In addition, if even one of the board modules 11 is inserted in the wrong position, for example, if the board module 11 shown third from the outside in FIG. 1 is inserted incorrectly, the incorrectly inserted board The detection lines 15 connected to other than the module 11 have the same electrical circuits open as described above, but the incorrectly inserted board module 1
The detection line 15 connected to 1 is the detection terminal wire 15
a.

Connecting conductor 1.18゜1 where 15b is electrically conductive on the front and back sides
By connecting it to 1b, it is electrically short-circuited and the circuit is closed. By electrically detecting this open state, the erroneous insertion detector 16 determines that there is a 9-board module 11 inserted in an incorrect position. Based on this determination of incorrect insertion, a switch ON command is not issued, the power switch 13 is kept in an OFF state, and power supply from the power source 12 to the control unit is blocked, thereby preventing malfunction of the control unit due to the incorrect insertion. In addition to preventing the elements from being destroyed, the erroneous insertion warning section 18 is activated to warn the operator. That is, an incorrect insertion warning sound or lamp is turned on to display an incorrect insertion warning, and the operator is prompted to quickly find the incorrectly inserted board module 11 and reinsert it into the correct position.

In addition, with such a configuration, the alignment keys 11c and 11d on the front and back sides of the connector connection portion of each board module 11 can be placed at arbitrary positions among the many connecting conductors arranged in front and back pairs after the board module 11 is manufactured. Since it can be easily obtained by selecting a single board and cutting off electrical continuity, when obtaining various board modules 11 from the same board, it can be used as a mere connecting conductor by establishing electrical continuity with each other. Therefore, the settings can be easily changed to other positions, and for this reason, even when different functions are shared on the same board module 11, each positioning key position can be set differently for each board module. Become.

Furthermore, this method electrically detects incorrect insertion of the board module 11, but when the board module 11 is incorrectly inserted, the connection terminal wires 15a and 15b of the detection line 15 are short-circuited by the front and back connection conductors 118, 11b, so the detection signal is used to detect the incorrect insertion. Board module 11
This will not cause damage to the internal elements of the device.

〔Effect of the invention〕

As described above, the present invention includes a large number of pairs of front and back connecting conductors that are arranged on the front and back surfaces of each connector connection part of a plurality of board modules housed in a control unit, and that are electrically connected to each other on the front and back sides. Among them, a pair of front and back connecting conductors at unique positions that differ for each board module are electrically disconnected from each other and used as alignment keys, while a pair of front and back connecting conductors at the above front and back positions are placed on the connector side into which the connector connection part of each board module is fitted. The structure is equipped with a board module misinsertion detector that detects incorrect insertion when connected to the front and back connection conductors other than the mating key, prevents power supply to the control unit, and warns of incorrect insertion of the board module. All the problems of the erroneous insertion prevention method using keys or marks can be successfully solved, the erroneous insertion of each board module can be electrically detected reliably, and the malfunction of the control unit and destruction of the board module can be prevented. This makes it possible to quickly discover and correct incorrect insertion of the board module, which is very effective and simple in preventing incorrect insertion.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of a conventional method for preventing incorrect insertion using a keyway and key, and Fig. 3 is an illustration of a method for preventing incorrect insertion using a conventional mark. FIG. 11... Board module, 118. 11b... Front and back connection conductor, 11G, 11d... Positioning key, 12.
... Power supply, 13... Power switch, 14... Control unit power line, 15... Detection line, 15a. 15b... Connection terminal wire, 16... Misinsertion detector, 1
7... Switch command line, 18... Misinsertion warning section, 19... Misinsertion detector power line. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 3

Claims (1)

[Claims] In a control device in which a plurality of board modules are housed in a control unit, a large number of pairs of front and back connections are arranged on the front and back surfaces of the connector connection portion of each board module and are electrically connected to each other on the front and back sides. Of the conductors,
A pair of front and back connecting conductors at different unique positions for each board module are electrically disconnected from each other and used as alignment keys.
When the connector connection part of each board module is connected to the front and back connecting conductors other than the above front and back alignment keys on the connector side into which it is fitted, incorrect insertion detection is activated to prevent power supply to the control unit and warn of incorrect board module insertion. A control device with a function to prevent incorrect insertion of a board module, characterized in that it is configured with a board module incorrect insertion detector.