JPH05122043A - Input device - Google Patents

Input device

Info

Publication number
JPH05122043A
JPH05122043A JP28158991A JP28158991A JPH05122043A JP H05122043 A JPH05122043 A JP H05122043A JP 28158991 A JP28158991 A JP 28158991A JP 28158991 A JP28158991 A JP 28158991A JP H05122043 A JPH05122043 A JP H05122043A
Authority
JP
Japan
Prior art keywords
external
power supply
power source
photocoupler
input
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.)
Pending
Application number
JP28158991A
Other languages
Japanese (ja)
Inventor
Shigezo Kuriyama
茂三 栗山
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP28158991A priority Critical patent/JPH05122043A/en
Publication of JPH05122043A publication Critical patent/JPH05122043A/en
Pending legal-status Critical Current

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  • Programmable Controllers (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To prevent a malfunction of an input device due to potential difference between a power source on an input device side and the power source on the external part device side. CONSTITUTION:Input terminals I and G for inputting a signal from an external device, a photocoupler 4 being an insulation elemant for insulating and transmitting the signal inputted the input terminals I and G and the internal power source 6 for pressing the primaly side of the photocoupler 4 are provided in the input device which is characterized by providing an external power source terminal P for pressing the first side of the photocoupler 4 by the external power source 12 provided in the external device and a power source selecting circuit which is provided between the external power source terminal P and the internal power source 6 and where the element having a one-direction continuity characteristic is serially connected so as to change the direction into the reverse direction and also the primaly side of the photocoupler 4 is connected with the connection point 13.

Description

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

【0001】[0001]

【産業上の利用分野】この発明は、外部装置からの信号
を絶縁して取り込む入力装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input device which receives a signal from an external device in an insulated manner.

【0002】[0002]

【従来の技術】図4は、従来の入力装置を示す回路図で
ある。図において、I,Gは外部より指令信号等の信号
を入力するための入力端子で、端子台またはコネクター
の端子である。4は入力した信号を、絶縁して伝送する
絶縁素子であるフォトカプラー、6はそのフォトカプラ
ーの1次側に対し電源を供給するための電源、3はフォ
トカプラーに流れる電流を制限する抵抗である。5はフ
ォトカプラーの2次側の電流を制限する抵抗である。
2. Description of the Related Art FIG. 4 is a circuit diagram showing a conventional input device. In the figure, I and G are input terminals for inputting signals such as command signals from the outside, which are terminals of a terminal block or a connector. 4 is a photocoupler that is an insulating element that insulates and transmits the input signal, 6 is a power supply for supplying power to the primary side of the photocoupler, and 3 is a resistor that limits the current flowing through the photocoupler. is there. Reference numeral 5 is a resistor that limits the current on the secondary side of the photocoupler.

【0003】図5は、従来の入力装置に外部指令装置が
接続された例を示す回路図である。外部指令装置のオー
プンコレクタ出力のトランジスター10がオフ(OF
F)の時は、フォトカプラー4に電流が流れないが、外
部指令装置のトランジスター10がオン(ON)する
と、フォトカプラー4の1次側に電流が流れる。即ち、
フォトカプラー4の1次側が付勢される。これにより2
次側出力7が変化し、指令信号が取り込まれる。
FIG. 5 is a circuit diagram showing an example in which an external command device is connected to a conventional input device. The transistor 10 of the open collector output of the external command device is turned off (OF
In the case of F), no current flows through the photocoupler 4, but when the transistor 10 of the external command device is turned on (ON), current flows through the primary side of the photocoupler 4. That is,
The primary side of the photocoupler 4 is energized. This makes 2
The secondary output 7 changes and the command signal is taken in.

【0004】なお、上述の外部指令装置は、例えばプロ
グラマブルコントローラで、入力装置はプログラマブル
コントローラにより制御される装置、例えばインバータ
装置に設けられた入力装置であるが、図は指令信号の出
力とその指令信号の入力に関する部分のみ図示してあ
る。
The above-mentioned external command device is, for example, a programmable controller, and the input device is a device controlled by the programmable controller, for example, an input device provided in an inverter device. However, the figure shows the output of a command signal and its command. Only the part related to signal input is shown.

【0005】[0005]

【発明が解決しようとする課題】従来の入力装置では、
例えば、図6に示すように、外部指令装置にトランジス
ターの破損を防止するダイオード11が入っている場
合、外部指令装置の電源12の電圧が入力装置側の内部
電源6の電圧よりも低いとき、外部指令装置のトランジ
スター10がONしていないにもかかわらず、2つのダ
イオード、即ちフォトカプラーのダイオード及びダイオ
ード11を通ってフォトカプラー4に電流が流れ、指令
信号が入るという不具合が発生する場合があった。
In the conventional input device,
For example, as shown in FIG. 6, when the external command device includes a diode 11 for preventing transistor damage, when the voltage of the power supply 12 of the external command device is lower than the voltage of the internal power supply 6 of the input device, Although the transistor 10 of the external command device is not turned on, a current may flow to the photocoupler 4 through the two diodes, that is, the diode of the photocoupler and the diode 11, and a command signal may be input. there were.

【0006】この発明は、上記のような問題点を解決す
るためになされたもので、外部電源電圧が低い場合で
も、確実に指令を伝える入力装置を得ることを目的とし
ている。
The present invention has been made to solve the above problems, and an object thereof is to obtain an input device which surely transmits a command even when the external power supply voltage is low.

【0007】[0007]

【課題を解決するための手段】この発明に係る入力装置
は、外部装置より信号を入力するための入力端子と、こ
の入力端子に入力された信号を絶縁して送るための絶縁
素子と、この絶縁素子の1次側を付勢するための内部電
源とを有する入力装置において、絶縁素子の1次側の付
勢を外部装置が有する外部電源により行なうための外部
電源端子と、この外部電源端子と内部電源との間に設け
られ、一方向に導通特性を有する素子をその方向が逆方
向となるように直列に接続すると共にその接続点に絶縁
素子の1次側が接続された電源選択回路とを備えたもの
である。
An input device according to the present invention includes an input terminal for inputting a signal from an external device, an insulating element for insulating and transmitting a signal input to the input terminal, In an input device having an internal power supply for energizing the primary side of an insulating element, an external power supply terminal for energizing the primary side of the insulating element by an external power supply included in an external device, and this external power supply terminal A power supply selection circuit that is provided between the power supply circuit and an internal power supply, and that has elements having conduction characteristics in one direction connected in series so that the directions are opposite to each other, and the primary side of the insulation element is connected to the connection point. It is equipped with.

【0008】[0008]

【作用】この発明においては、外部電源端子に外部装置
側の外部電源を接続することができ、その場合、電源選
択回路は外部電源を選択して絶縁素子の1次側に供給す
る。入力端子に電源をもたない外部装置を接続したとき
は、電源選択回路は内部電源を選択して絶縁素子の1次
側に供給する。
According to the present invention, an external power source on the external device side can be connected to the external power source terminal. In this case, the power source selection circuit selects the external power source and supplies it to the primary side of the insulating element. When an external device having no power supply is connected to the input terminal, the power supply selection circuit selects the internal power supply and supplies it to the primary side of the insulating element.

【0009】[0009]

【実施例】実施例1.図1はこの発明の一実施例を示す
回路図である。図1において、図4〜図6と同一符号を
付した部分は同一部分を示し、Pは外部電源端子で、外
部指令装置より電源を供給するための端子台またはコネ
クターの端子である。1,2はダイオードで、互いに逆
極性で直列に接続されている。また、その接続点13に
はフォトカプラー4の1次側の電流を制限する抵抗3が
接続されている。このダイオード1,2は、端子P,I
に外部電源と外部指令を接続したときは、フォトカプラ
ー4の1次側に対する電源の供給を外部電源12からと
し、端子I,Gに外部指令を接続したときは、フォトカ
プラー4の1次側に対する電源の供給を内部電源6から
とする機能を有する。即ち、電源供給を選択する機能を
有する。また、誤って端子P,Gに外部より電源を供給
した場合、内部電源6と外部電源12の短絡を防止する
機能を有するものである。
EXAMPLES Example 1. FIG. 1 is a circuit diagram showing an embodiment of the present invention. In FIG. 1, the parts denoted by the same reference numerals as those in FIGS. 4 to 6 indicate the same parts, and P is an external power supply terminal, which is a terminal block or a terminal of a connector for supplying power from an external command device. Reference numerals 1 and 2 are diodes, which have opposite polarities and are connected in series. A resistor 3 that limits the current on the primary side of the photocoupler 4 is connected to the connection point 13. These diodes 1 and 2 have terminals P and I
When an external power source and an external command are connected to, the power supply to the primary side of the photocoupler 4 is from the external power source 12, and when an external command is connected to the terminals I and G, the primary side of the photocoupler 4 is connected. It has a function to supply power to the internal power source 6. That is, it has a function of selecting power supply. Further, it has a function of preventing a short circuit between the internal power supply 6 and the external power supply 12 when the power is externally supplied to the terminals P and G by mistake.

【0010】次に、動作を説明する。図2は、トランジ
スター10の破損を防止するダイオード11をもった外
部指令装置を接続した例である。端子P,Iに外部電源
と外部指令を接続する。このときは、フォトカプラー4
の1次側に対する電源は、ダイオード1を介して外部指
令装置の電源12より供給される。即ち、フォトカプラ
ー4の1次側は外部電源12により付勢される。従っ
て、外部指令装置の電源電圧が、内部電源電圧より低い
ときでも問題なく、トランジスター10のON,OFF
のみで、フォトカプラー4の1次側の電流状態が決定で
きる。図3は、電源をもたない外部指令装置を接続した
例である。端子I,Gに外部指令を接続する。このとき
は、フォトカプラー4の1次側電源は、ダイオード2を
介して内部電源6より供給され、従来例と同様に機能を
発揮する。なお、上記実施例は、入力信号を絶縁して送
るための素子としてフォトカプラーを用いたが、リレー
を用いても同様の効果を奏する。
Next, the operation will be described. FIG. 2 is an example in which an external command device having a diode 11 for preventing damage to the transistor 10 is connected. Connect an external power supply and external command to terminals P and I. At this time, photo coupler 4
The power source for the primary side of is supplied from the power source 12 of the external command device via the diode 1. That is, the primary side of the photocoupler 4 is energized by the external power supply 12. Therefore, even when the power supply voltage of the external command device is lower than the internal power supply voltage, there is no problem and the transistor 10 is turned on and off.
Only by this, the current state on the primary side of the photocoupler 4 can be determined. FIG. 3 is an example in which an external command device without a power supply is connected. Connect an external command to terminals I and G. At this time, the primary power supply of the photocoupler 4 is supplied from the internal power supply 6 via the diode 2, and functions similarly to the conventional example. Although the photocoupler is used as the element for insulating and transmitting the input signal in the above-mentioned embodiment, the same effect can be obtained by using the relay.

【0011】[0011]

【発明の効果】この発明は以上説明したとおり、外部電
源端子に外部装置側の外部電源を接続することができ、
その場合、電源選択回路は外部電源を選択して絶縁素子
の1次側に供給する。入力端子に電源をもたない外部装
置を接続したときは、電源選択回路は内部電源を選択し
て絶縁素子の1次側に供給するから、端子への配線の仕
方だけで、絶縁素子の1次側への電源の供給を内部電源
からとするか、外部指令装置の電源からとするか、使い
分けることができ、外部電源と内部電源との電圧電位差
による回り込みによって生ずる誤動作を防止することが
できる。
As described above, according to the present invention, it is possible to connect the external power source on the external device side to the external power source terminal,
In that case, the power supply selection circuit selects an external power supply and supplies it to the primary side of the insulating element. When an external device that does not have a power supply is connected to the input terminal, the power supply selection circuit selects the internal power supply and supplies it to the primary side of the insulation element. Power can be supplied to the secondary side from the internal power supply or from the power supply of the external command device, and it is possible to prevent malfunction due to sneaking due to the voltage potential difference between the external power supply and the internal power supply. ..

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

【図1】この発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention.

【図2】この発明の一実施例における外部指令装置の接
続例を示す回路図である。
FIG. 2 is a circuit diagram showing a connection example of an external command device according to an embodiment of the present invention.

【図3】この発明の一実施例における外部指令装置の接
続の他の例を示す回路図である。
FIG. 3 is a circuit diagram showing another example of connection of the external command device in the embodiment of the present invention.

【図4】従来の入力装置を示す回路図である。FIG. 4 is a circuit diagram showing a conventional input device.

【図5】従来の入力装置における外部指令装置の接続例
を示す回路図である。
FIG. 5 is a circuit diagram showing a connection example of an external command device in a conventional input device.

【図6】従来の入力装置における外部指令装置の接続の
他の例を示す回路図である。
FIG. 6 is a circuit diagram showing another example of connection of an external command device in a conventional input device.

【符号の説明】[Explanation of symbols]

1 ダイオード 2 ダイオード 4 フォトカプラー 6 内部電源 10 トランジスター 11 ダイオード 12 外部電源 I,G 入力端子 P 外部電源端子 1 diode 2 diode 4 photo coupler 6 internal power supply 10 transistor 11 diode 12 external power supply I, G input terminal P external power supply terminal

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 外部装置より信号を入力するための入力
端子と、この入力端子に入力された信号を絶縁して送る
ための絶縁素子と、この絶縁素子の1次側を付勢するた
めの内部電源とを有する入力装置において、 前記絶縁素子の1次側の付勢を前記外部装置が有する外
部電源により行なうための外部電源端子と、この外部電
源端子と前記内部電源との間に設けられ、一方向に導通
特性を有する素子をその方向が逆方向となるように直列
に接続すると共にその接続点に前記絶縁素子の1次側が
接続された電源選択回路とを備えたことを特徴とする入
力装置。
1. An input terminal for inputting a signal from an external device, an insulating element for insulating and transmitting a signal input to the input terminal, and an energizing primary side of the insulating element. In an input device having an internal power supply, an external power supply terminal for energizing the primary side of the insulating element by an external power supply of the external device, and provided between the external power supply terminal and the internal power supply. A power supply selection circuit in which elements having conduction characteristics in one direction are connected in series so that the directions thereof are opposite directions, and the primary side of the insulating element is connected to the connection point. Input device.
JP28158991A 1991-10-28 1991-10-28 Input device Pending JPH05122043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28158991A JPH05122043A (en) 1991-10-28 1991-10-28 Input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28158991A JPH05122043A (en) 1991-10-28 1991-10-28 Input device

Publications (1)

Publication Number Publication Date
JPH05122043A true JPH05122043A (en) 1993-05-18

Family

ID=17641259

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28158991A Pending JPH05122043A (en) 1991-10-28 1991-10-28 Input device

Country Status (1)

Country Link
JP (1) JPH05122043A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005089035A1 (en) * 2004-03-17 2005-09-22 Daikin Industries, Ltd. Controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005089035A1 (en) * 2004-03-17 2005-09-22 Daikin Industries, Ltd. Controller

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