JPH06164092A - Method for protecting insertion and drawing of printed board - Google Patents

Method for protecting insertion and drawing of printed board

Info

Publication number
JPH06164092A
JPH06164092A JP30912992A JP30912992A JPH06164092A JP H06164092 A JPH06164092 A JP H06164092A JP 30912992 A JP30912992 A JP 30912992A JP 30912992 A JP30912992 A JP 30912992A JP H06164092 A JPH06164092 A JP H06164092A
Authority
JP
Japan
Prior art keywords
circuit
printed board
state holding
holding circuit
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP30912992A
Other languages
Japanese (ja)
Inventor
Takekuni Onoe
建国 尾上
Masanori Toda
雅宣 戸田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP30912992A priority Critical patent/JPH06164092A/en
Publication of JPH06164092A publication Critical patent/JPH06164092A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/14—Structural association of two or more printed circuits
    • H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters

Landscapes

  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)

Abstract

PURPOSE:In a method for protecting the insertion and drawing of a printed board having a state holding circuit, to provide a method for protecting the insertion and drawing of a printed board which doubly protects the circuit from the insertion and drawing of the printed board, by also restoring the circuit to an initial value when the printed board is drawn out. CONSTITUTION:In a printed board having at least pins for supplying an earth potential and for supplying a predetermined voltage, and having mounted thereon a state holding circuit 500, and a reset circuit 100 having a function of initializing the state holding circuit 500 when the printed board is connected to a device, the length of the pin for supplying an earth potential is set shorter than other pins by a predetermined amount. Further, in the reset circuit 100, is provided a control means 900 connected to the pin for supplying an earth potential for outputting a signal to initialize the state holding circuit 500 when the printed board is removed from the device, whereby the state holding circuit 500 is also initialized when the printed board is removed from the device.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は状態保持回路を搭載した
プリント板の挿抜保護方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insertion / removal protection system for a printed circuit board having a status holding circuit.

【０００２】保持型リレー（ラッチリレー等）を使用し
た状態保持回路を搭載したプリント板においては、プリ
ント板挿抜の際にも状態を保持する機能を有する。この
ラッチリレーがマイクロコンピュータにより制御される
場合に、例えばプリント板を修理のために抜いた後あら
ためて挿入した間に制御命令を変えてしまった時、前回
の状態と違い、制御信号が来るまで不確定動作をするお
それがあり、それを防止する必要がある。A printed circuit board equipped with a status holding circuit using a holding type relay (latch relay or the like) has a function of holding the status even when the printed board is inserted or removed. When this latch relay is controlled by a microcomputer, for example, when the control command is changed while inserting the printed circuit board for repair and then inserting it again, unlike the previous state, it does not wait until the control signal arrives. There is a risk of a confirmation operation, and it is necessary to prevent this.

【０００３】[0003]

【従来の技術】図３は従来例のプリント板の回路構成図
である。図３において、プリント板を装置のコネクタか
ら抜いて所定の修理を行った後再びコネクタに挿入した
場合、電源電圧Ｖccが状態保持回路５内のリセット用の
リレー駆動回路６及びセット用のリレー駆動回路７の一
端に加えられるとともに、リセット回路１内の比較器３
の一方の入力端子（＋）とタイマ２に加えられる。タイ
マ２は例えば充電回路で構成され、一定時間経過後この
電源電圧（Ｖcc）を比較器３の他方の入力端子（−）に
加える。比較器３では、（＋）入力端子に電源電圧Ｖcc
を加えた直後から"L" レベル信号を出力し、タイマ２で
決まる一定時間後２つの入力レベルが等しくなった時
"H" レベル信号を出力する。2. Description of the Related Art FIG. 3 is a circuit diagram of a conventional printed board. In FIG. 3, when the printed board is pulled out from the connector of the apparatus and repaired for a predetermined period and then inserted again into the connector, the power supply voltage Vcc causes the reset relay drive circuit 6 in the state holding circuit 5 and the set relay drive The comparator 3 in the reset circuit 1 is added to one end of the circuit 7.
One input terminal (+) and the timer 2 are added. The timer 2 is composed of, for example, a charging circuit, and after a certain period of time has passed, this power supply voltage (Vcc) is applied to the other input terminal (-) of the comparator 3. In the comparator 3, the power supply voltage Vcc is applied to the (+) input terminal.
"L" level signal is output immediately after adding, and when the two input levels become equal after a fixed time determined by timer 2.
Output "H" level signal.

【０００４】この比較器３の出力を論理積回路（以下Ａ
ＮＤ回路と称する）４を介して前述した状態保持回路５
内のリセット用のリレー駆動回路６の他端に加える。リ
レー駆動回路６ではこの"L" レベル信号が加えられる期
間中駆動電流が流れ、リレーの接点８をリセットする。
"L" レベルの期間はリレー駆動回路６がリレーの接点８
を駆動するために要する時間よりも大きく設定してお
く。尚、マイクロコンピュータ（図示しない）からの制
御信号によりリレーの接点８をリセット、又はセットす
る時には、それぞれリレー駆動回路６又は７により行
う。The output of the comparator 3 is connected to an AND circuit (hereinafter referred to as A
(Hereinafter referred to as ND circuit) 4 via the state holding circuit 5 described above.
It is added to the other end of the relay drive circuit 6 for reset. In the relay drive circuit 6, a drive current flows during the period in which the "L" level signal is applied, and the contact 8 of the relay is reset.
During the "L" level period, the relay drive circuit 6 contacts the relay contacts 8
It is set to be longer than the time required to drive the. When the contact 8 of the relay is reset or set by a control signal from a microcomputer (not shown), it is performed by the relay drive circuit 6 or 7, respectively.

【０００５】このようにして従来は、リセット回路を用
い、プリント板に電源が加えられてからある一定時間リ
セット出力を行うことで状態保持回路を初期値に戻して
いた。As described above, conventionally, the reset circuit is used to reset the state holding circuit to the initial value by performing reset output for a certain period of time after power is applied to the printed board.

【０００６】[0006]

【発明が解決しようとする課題】しかしながら上述した
回路構成においては、プリント板を抜く時にはなにも制
御を行っていないため、例えばプリント板を修理のため
に抜いた後あらためて挿入した間に制御命令を変えてし
まった場合、制御信号が来るまでの間不確定動作をする
おそれがあるという問題点があった。However, in the above circuit configuration, since no control is performed when the printed board is removed, for example, a control command is issued while the printed board is removed for repair and then reinserted. If is changed, there is a problem that an uncertain operation may occur until the control signal arrives.

【０００７】したがって本発明は、プリント板を抜く時
にも回路を初期値に戻すことにより、プリント板の挿抜
に対し二重に保護をかけプリント板を初期値に固定させ
ることが可能なプリント板の挿抜保護方式を提供するこ
とを目的とする。Therefore, according to the present invention, the circuit is returned to the initial value even when the printed board is removed, so that the printed board can be fixed to the initial value by providing double protection against insertion and removal of the printed board. The purpose is to provide a mating / unmating protection system.

【０００８】[0008]

【課題を解決するための手段】上記問題点は図１に示す
回路の構成によって解決される。即ち図１において、少
なくともアース電位及び所定電圧を供給するためのピン
を有し、ピンを介して装置に接続されるプリント板であ
って、制御信号により設定された状態を保持する状態保
持回路500 と、プリント板を装置に接続した時状態保持
回路500 を初期化する機能を有するリセット回路100 と
を搭載するプリント板において、前記アース電位を供給
するためのピンの長さを他のピンの長さよりも一定量だ
け短く設定し、前記アース電位を供給するためのピンに
接続され、前記プリント板を前記装置からはずした時前
記状態保持回路500 を初期化するための信号を出力する
制御部900 を前記リセット回路100 に設け、前記プリン
ト板を前記装置からはずした時にも前記状態保持回路50
0 を初期化するように構成する。The above problems can be solved by the circuit configuration shown in FIG. That is, in FIG. 1, a printed circuit board which has at least a pin for supplying a ground potential and a predetermined voltage, and which is connected to the apparatus through the pin, and which holds a state set by a control signal 500. And a reset circuit 100 having the function of initializing the state holding circuit 500 when the printed board is connected to the device, the length of the pin for supplying the ground potential is set to the length of other pins. A control unit 900 which is set to be shorter than the above by a certain amount, is connected to a pin for supplying the ground potential, and outputs a signal for initializing the state holding circuit 500 when the printed board is removed from the apparatus. Is provided in the reset circuit 100, and the state holding circuit 50 is provided even when the printed board is removed from the device.
Configure to initialize 0.

【０００９】[0009]

【作用】図１において、アース電位を供給するためのピ
ンの長さを他のピンの長さよりも一定量だけ短く設定し
てあるため、プリント板を装置からはずした時、所定電
圧を供給するためのピンは装置に接続された状態でアー
ス電位を供給するためのピンだけがまずはずれる。制御
部900 でこれを検知して制御部900 から状態保持回路50
0 を初期化するための信号を出力する。この結果、プリ
ント板を装置からはずした時にも状態保持回路500 を初
期化することができる。In FIG. 1, since the length of the pin for supplying the ground potential is set to be shorter than the length of the other pins by a fixed amount, a predetermined voltage is supplied when the printed board is removed from the apparatus. Only the pin for supplying the ground potential is disconnected when it is connected to the device. The control unit 900 detects this and the control unit 900 sends the status holding circuit 50.
Output a signal to initialize 0. As a result, the state holding circuit 500 can be initialized even when the printed board is removed from the device.

【００１０】[0010]

【実施例】図２は本発明の実施例のプリント板の回路構
成図である。全図を通じて同一符号は同一対象物を示
す。FIG. 2 is a circuit diagram of a printed board according to an embodiment of the present invention. The same reference numerals denote the same objects throughout the drawings.

【００１１】図２において、まずプリント板を装置のコ
ネクタに接続する場合について説明する。この場合、従
来例で説明したと同様にして、電源電圧Ｖccが長ピン
（ａ）を介して状態保持回路５内のリセット用のリレー
駆動回路６及びセット用のリレー駆動回路７の一端に加
えられるとともに、比較器３の一方の入力端子（＋）、
タイマ２及び抵抗Ｒを介してインバータ９に加えられ
る。一方、アース電位が短ピン（ｂ）を介してインバー
タ９に加えられ、反転されて"H" レベル信号となってＡ
ＮＤ回路10の一方の端子に加えられる。Referring to FIG. 2, first, the case where the printed board is connected to the connector of the apparatus will be described. In this case, in the same manner as described in the conventional example, the power supply voltage Vcc is applied to one end of the reset relay drive circuit 6 and the set relay drive circuit 7 in the state holding circuit 5 via the long pin (a). And one input terminal (+) of the comparator 3,
It is applied to the inverter 9 via the timer 2 and the resistor R. On the other hand, the ground potential is applied to the inverter 9 via the short pin (b) and inverted to become the "H" level signal.
It is added to one terminal of the ND circuit 10.

【００１２】タイマ２は例えば充電回路で構成され、一
定時間経過後この電源電圧（Ｖcc）をＡＮＤ回路10を介
して比較器３の（−）入力端子に加える。比較器３で
は、（＋）入力端子に電源電圧Ｖccを加えた直後から
"L" レベル信号を出力し、タイマ２で決まる一定時間後
２つの入力レベルが等しくなった時"H" レベル信号を出
力する。The timer 2 is composed of, for example, a charging circuit, and after a lapse of a fixed time, this power supply voltage (Vcc) is applied to the (-) input terminal of the comparator 3 via the AND circuit 10. In the comparator 3, immediately after the power supply voltage Vcc is applied to the (+) input terminal,
The "L" level signal is output and the "H" level signal is output when the two input levels become equal after a fixed time determined by timer 2.

【００１３】この比較器３の出力をＡＮＤ回路４を介し
て前述した状態保持回路５内のリセット用のリレー駆動
回路６の他端に加える。リレー駆動回路６ではこの"L"
レベル信号が加えられる期間中駆動電流が流れ、リレー
の接点８をリセットする。"L" レベルの期間はリレー駆
動回路６がリレーの接点８を駆動するために要する時間
よりも大きく設定しておく。尚、マイクロコンピュータ
（図示しない）からの制御信号によりリレーの接点８を
リセット、又はセットする時には、それぞれリレー駆動
回路６又は７により行う。The output of the comparator 3 is applied to the other end of the reset relay drive circuit 6 in the state holding circuit 5 via the AND circuit 4. In the relay drive circuit 6, this "L"
The drive current flows during the period when the level signal is applied, and the contact 8 of the relay is reset. The "L" level period is set to be longer than the time required for the relay drive circuit 6 to drive the contact 8 of the relay. When the contact 8 of the relay is reset or set by a control signal from a microcomputer (not shown), it is performed by the relay drive circuit 6 or 7, respectively.

【００１４】次に、プリント板を装置のコネクタから抜
く場合について説明する。図２において、インバータ９
に接続される短ピン（ｂ）の長さを予め他のピン（長ピ
ン（ａ）、（ｃ）等）より一定寸法だけ短くしておく。
このプリント板を装置のコネクタから抜く時他の長ピン
（ａ）、（ｃ）がコネクタに接続されている時でもこの
短ピン（ｂ）だけ先に（今の場合）アース電位からはず
れる。その結果、インバータ９の出力はそれまで"H" レ
ベルであったものが電源電圧Ｖccにより"L" レベルとな
り、ＡＮＤ回路10を介して比較器３の（−）入力端子に
この"L" レベル信号が入力される。Next, the case where the printed board is pulled out from the connector of the apparatus will be described. In FIG. 2, the inverter 9
The length of the short pin (b) connected to is shorter than the other pins (long pins (a), (c), etc.) by a certain size.
Even when other long pins (a) and (c) are connected to the connector when the printed board is pulled out from the connector of the device, only the short pin (b) is deviated from the ground potential earlier (in the present case). As a result, the output of the inverter 9 which has been at "H" level until then becomes "L" level due to the power supply voltage Vcc, and this "L" level is applied to the (-) input terminal of the comparator 3 via the AND circuit 10. A signal is input.

【００１５】一方、比較器３の（＋）入力端子には電源
電圧Ｖccが入力されているため、比較器３からは"L" レ
ベル信号を出力し、ＡＮＤ回路４を介してリレー駆動回
路６の一方の端子に加える。リレー駆動回路６の他方の
端子には電源電圧Ｖccが加えられているため、リレー駆
動回路６には駆動電流が流れ、リレーの接点８をリセッ
トし初期化を行う。その後、他のピン（ａ）、（ｃ）も
コネクタからはずれるため、リレー駆動回路６には電流
が流れなくなり、回路の動作を停止する。On the other hand, since the power source voltage Vcc is input to the (+) input terminal of the comparator 3, the comparator 3 outputs an "L" level signal, and the relay drive circuit 6 is supplied via the AND circuit 4. Add to one terminal. Since the power supply voltage Vcc is applied to the other terminal of the relay drive circuit 6, a drive current flows through the relay drive circuit 6 to reset and initialize the contact 8 of the relay. After that, the other pins (a) and (c) also come off the connector, so that no current flows in the relay drive circuit 6 and the operation of the circuit is stopped.

【００１６】尚、リレーの接点を駆動するための時間を
例えば７ｍｓ、長ピン（ａ）、（ｃ）の長さを１cmとし
た時、短ピン（ｂ）の長さとして１ｍｍ程度短くして
（９ｍｍ程度に）しておけば十分と考えられる。When the time for driving the contacts of the relay is 7 ms and the length of the long pins (a) and (c) is 1 cm, the length of the short pin (b) is shortened by about 1 mm. It is considered to be sufficient if it is set (about 9 mm).

【００１７】この結果、状態保持回路を有するプリント
板を装置のコネクタに挿入する時、あるいは抜く時のど
ちらの場合にも状態保持回路を初期値に戻すことができ
る。As a result, the state holding circuit can be returned to the initial value either when the printed board having the state holding circuit is inserted into the connector of the apparatus or when it is removed.

【００１８】[0018]

【発明の効果】以上説明したように本発明によれば、状
態保持回路を有するプリント板の挿抜時のどちらの場合
にも状態保持回路を初期値に戻すことにより、二重に回
路を保護し不確定動作をなくするという顕著な効果を有
する。As described above, according to the present invention, the circuit is doubly protected by returning the state holding circuit to the initial value in both cases of insertion and removal of the printed circuit board having the state holding circuit. It has a remarkable effect of eliminating the uncertain operation.

【図面の簡単な説明】[Brief description of drawings]

【図１】は本発明の原理図、FIG. 1 is a principle diagram of the present invention,

【図２】は本発明の実施例のプリント板の回路構成図、FIG. 2 is a circuit configuration diagram of a printed board according to an embodiment of the present invention,

【図３】は従来例のプリント板の回路構成図である。FIG. 3 is a circuit configuration diagram of a conventional printed board.

【符号の説明】[Explanation of symbols]

100 はリセット回路、500 は状態保持回路、900 は制御
部を示す。Reference numeral 100 is a reset circuit, 500 is a state holding circuit, and 900 is a control unit.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 少なくともアース電位及び所定電圧を供
給するためのピンを有し、該ピンを介して装置に接続さ
れるプリント板であって、制御信号により設定された状
態を保持する状態保持回路(500) と、該プリント板を該
装置に接続した時該状態保持回路(500) を初期化する機
能を有するリセット回路(100) とを搭載するプリント板
において、 前記アース電位を供給するためのピンの長さを他のピン
の長さよりも一定量だけ短く設定し、 前記アース電位を供給するためのピンに接続され、前記
プリント板を前記装置からはずした時前記状態保持回路
(500) を初期化するための信号を出力する制御部(900)
を前記リセット回路(100) に設け、 前記プリント板を前記装置からはずした時にも前記状態
保持回路(500) を初期化する構成としたことを特徴とす
るプリント板の挿抜保護方式。1. A state holding circuit for holding a state set by a control signal, the printed circuit board having a pin for supplying at least an earth potential and a predetermined voltage, and being connected to an apparatus through the pin. (500) and a reset circuit (100) having a function of initializing the state holding circuit (500) when the printed board is connected to the device, The pin length is set to be shorter than the other pins by a certain amount, the pin is connected to the pin for supplying the ground potential, and the state holding circuit is provided when the printed board is removed from the device.
Control unit (900) that outputs a signal to initialize (500)
Is provided in the reset circuit (100), and the state holding circuit (500) is initialized even when the printed board is removed from the apparatus.
JP30912992A 1992-11-19 1992-11-19 Method for protecting insertion and drawing of printed board Withdrawn JPH06164092A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30912992A JPH06164092A (en) 1992-11-19 1992-11-19 Method for protecting insertion and drawing of printed board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30912992A JPH06164092A (en) 1992-11-19 1992-11-19 Method for protecting insertion and drawing of printed board

Publications (1)

Publication Number Publication Date
JPH06164092A true JPH06164092A (en) 1994-06-10

Family

ID=17989250

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30912992A Withdrawn JPH06164092A (en) 1992-11-19 1992-11-19 Method for protecting insertion and drawing of printed board

Country Status (1)

Country Link
JP (1) JPH06164092A (en)

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