JPH08114466A - Wire breakdown detector for encoder - Google Patents
Wire breakdown detector for encoderInfo
- Publication number
- JPH08114466A JPH08114466A JP6275816A JP27581694A JPH08114466A JP H08114466 A JPH08114466 A JP H08114466A JP 6275816 A JP6275816 A JP 6275816A JP 27581694 A JP27581694 A JP 27581694A JP H08114466 A JPH08114466 A JP H08114466A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- encoder
- light
- receiving element
- signal
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/18—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type
- C04B28/186—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type containing formed Ca-silicates before the final hardening step
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Optical Transform (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はコンプリメンタリ方式の
エンコーダの断線検出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 a disconnection detecting device for a complementary type encoder.
【０００２】[0002]
【従来の技術】エンコーダの、断線検出装置の第１の従
来例は、例えば特開平１−２８４７７０号公報のように
断線時の入力信号の中間電位を検出すれば断線と判断す
るものである。ハイあるいはローの２値からなるエンコ
ーダ出力を伝送する信号線と、この信号線の断線時の電
位を設定する断線電位設定手段と、この断線電位と前記
エンコーダ出力のハイ電位間に位置した高電位の基準レ
ベルを設定する高電位基準レベル設定手段と、前記断線
電位と前記エンコーダ出力のロー電位間に位置した低電
位の基準レベルを設定する低電位基準レベル設定手段
と、前記高電位の基準レベルに比べて該信号線の電位が
低いことを検出する第１の信号線電位検出手段と、前記
低電位の基準レベルに比べて該信号線の電位が高いこと
を検出する第２の信号線電位検出手段と、前記第１、第
２の信号線電位検出手段のアンド条件が成立した時から
所定時間経過後もアンド条件が成立した時から所定時間
経過後もアンド条件が成立する場合に断線検出信号を出
力する断線検出手段とを具備したエンコーダの断線検出
回路である。第２の従来例は、例えば特開平２−２９７
０１８号公報のように入力間に断線時のみ発光しない構
成にて発光素子を設けて受光素子が受光しなければ断線
と判断するものである。2. Description of the Related Art A first conventional example of a wire breakage detecting device for an encoder is to judge wire breakage by detecting an intermediate potential of an input signal at the time of wire breakage as disclosed in Japanese Patent Laid-Open No. 1-284770. A signal line for transmitting an encoder output consisting of binary values of high and low, a disconnection potential setting means for setting a potential when the signal line is disconnected, and a high potential positioned between the disconnection potential and the high potential of the encoder output. High potential reference level setting means for setting the reference level of the low potential, low potential reference level setting means for setting the reference level of the low potential located between the disconnection potential and the low potential of the encoder output, and the high potential reference level And a second signal line potential detecting means for detecting that the potential of the signal line is lower than that of the first potential, and a second signal line potential for detecting that the potential of the signal line is higher than the reference level of the low potential. When the AND condition of the detecting means and the first and second signal line potential detecting means is satisfied after the lapse of a predetermined time from the time when the AND condition is satisfied, and when the AND condition is satisfied even after the lapse of the predetermined time from the time when the AND condition is satisfied. A disconnection detecting circuit of encoders and a disconnection detecting means for outputting a disconnection detection signal. The second conventional example is disclosed in, for example, JP-A-2-297.
As disclosed in Japanese Patent No. 018, a light emitting element is provided between the inputs so that light is not emitted only when the wire is broken, and if the light receiving element does not receive light, it is determined that the wire is broken.
【０００３】[0003]
【発明が解決しようとする課題】ところが第１の従来技
術では、回路構成が複雑であることが問題である。特に
エンコーダがコンプリメンタリ方式のエンコーダの場合
は中間電位を設定する抵抗値の精度が要求される。第２
の従来技術ではエンコーダがコンプリメンタリ方式のエ
ンコーダの場合、入力信号レベルにより断線していなく
ても受光素子が受光しない場合があるため、断線を検出
できない。そこで本発明はエンコーダがコンプリメンタ
リ方式の場合において動作時及び停止時いずれの場合で
も常に断線及び信号検出ができ、且つ回路構成の簡単な
エンコーダの断線検出装置を提供することを目的とす
る。However, the first prior art has a problem that the circuit configuration is complicated. Especially when the encoder is a complementary encoder, the accuracy of the resistance value for setting the intermediate potential is required. Second
In the related art, when the encoder is a complementary encoder, the light receiving element may not receive light even if the wire is not broken depending on the input signal level, and therefore the wire break cannot be detected. Therefore, it is an object of the present invention to provide an encoder disconnection detection device which can always detect disconnection and a signal when the encoder is of the complementary type, both when operating and when stopped, and which has a simple circuit configuration.
【０００４】[0004]
【課題を解決するための手段】本発明は上記問題を解決
するため、コンプリメンタリ方式のエンコーダにおい
て、発光部の一端を第１の電源Ｖ１に接続し、前記発光
部の他端をエンコーダの信号線の一端Ｔ3 に接続した第
１の発光受光素子１と、発光部の一端を前記第１の電源
Ｖ１に接続し、前記発光部の他端を前記エンコーダの信
号線の他端Ｔ2 に接続した第２の発光受光素子２と、発
光部の両端をそれぞれ前記エンコーダの信号線の他端Ｔ
2 、一端Ｔ3 に接続した第３の発光受光素子３と、前記
第１の発光受光素子１と前記第２の発光受光素子２と前
記第３の発光受光素子３の各々の受光部端子Ｔ5 、Ｔ
6 、Ｔ7 に共通に接続された第２の電源Ｖ２と、前記第
２の発光受光素子２の受光部端子Ｔ6 と前記第３の発光
受光素子３の受光部端子Ｔ7 とを入力端子とするＡＮＤ
回路と、前記第１の発光受光素子１の受光部端子Ｔ5 と
前記ＡＮＤ回路の出力端子とを入力端子とするＮＯＲ回
路とからなる。In order to solve the above problems, the present invention is directed to a complementary type encoder in which one end of a light emitting portion is connected to a first power source V1 and the other end of the light emitting portion is connected to an encoder signal line. Of the first light emitting / receiving element 1 connected to one end T 3 of the light source, one end of the light emitting portion is connected to the first power source V 1, and the other end of the light emitting portion is connected to the other end T 2 of the signal line of the encoder. The second light emitting / receiving element 2 and the both ends of the light emitting portion are respectively connected to the other end T of the signal line of the encoder.
2 , the third light emitting / receiving element 3 connected to one end T 3 , the first light emitting / receiving element 1, the second light emitting / receiving element 2, and the light receiving terminal T of each of the third light emitting / receiving element 3 5 , T
6, a second power supply V2, which are connected in common to T 7, the second input and the light receiving unit terminal T 6 of the light-emitting light-receiving element 2 and the light receiving portion terminal T 7 of the third light-emitting light-receiving element 3 terminal AND AND
It comprises a circuit and a NOR circuit having the light receiving portion terminal T 5 of the first light emitting and receiving element 1 and the output terminal of the AND circuit as input terminals.
【０００５】[0005]
【作用】上記手段によりコンプリメンタリ方式のエンコ
ーダにおいて、信号線２が断線していない場合、電源Ｖ
１から信号線２を介してＧＮＤへ電流が流れる事により
発光受光素子１の発光素子が発光し受光素子は光を受け
る。受光素子が光を受けない状態でハイの論理信号が出
力されるので発光受光素子１の出力レベルにより断線を
検出できる。発光受光素子２は信号線１が断線していな
い場合エンコーダからの入力信号レベルがハイの時前記
受光素子の論理信号がハイになる。一方エンコーダ検出
信号は入力信号がハイの時ローレベルとなるため発光受
光素子２の出力レベルとエンコーダ検出信号レベルが共
にハイであれば断線であると判断できる。又前記発光受
光素子はすべてエンコーダ出力回路から電気的に絶縁さ
れており、信号線からのノイズを受けない。With the above-mentioned means, in the complementary type encoder, when the signal line 2 is not broken, the power source V
When a current flows from 1 to GND through the signal line 2, the light emitting element of the light emitting and receiving element 1 emits light and the light receiving element receives light. Since a high logic signal is output when the light receiving element does not receive light, disconnection can be detected by the output level of the light emitting and receiving element 1. In the light emitting / receiving element 2, when the signal line 1 is not broken, the logic signal of the light receiving element becomes high when the input signal level from the encoder is high. On the other hand, since the encoder detection signal is at the low level when the input signal is high, if the output level of the light emitting / receiving element 2 and the encoder detection signal level are both high, it can be determined that the wire is broken. Further, all the light emitting and receiving elements are electrically insulated from the encoder output circuit, and noise from the signal line is not received.
【０００６】[0006]
【実施例】次に、本発明の一実施例におけるエンコーダ
の断線検出装置を、図に基づいて説明する。図１は断線
検出回路とエンコーダ検出回路の結線例を示す。１は第
１の発光受光素子、２は第２の発光受光素子、３はエン
コーダからの入力信号を検出する第３の発光受光素子、
Ｖ１は第１の電源で、エンコーダに給電され、Ｖ２は信
号線から絶縁された第２の電源、Ａ、Ｂは断線検出回
路、Ｃはエンコーダ信号検出回路でありエンコーダから
の入力信号を反転しエンコーダ検出信号を出力する。一
対のエンコーダ信号線の一端Ｔ3 は、第１の発光受光素
子１の発光部端子を介して第１の電源Ｖ１に接続され、
エンコーダ信号線の他端Ｔ2 は、第２の発光受光素子２
の発光部端子を介して前記第１の電源Ｖ１に接続されて
いる。第１の発光受光素子１と第２の発光受光素子２の
受光部端子Ｔ5 、Ｔ6 は各々第２の電源Ｖ２と論理回路
Ｄに接続されている。前記第３の発光受光素子３の受光
部端子Ｔ7 は前記第２の電源Ｖ２と論理回路Ｄに接続さ
れている。論理回路Ｄは、ＡＮＤ回路とＮＯＲ回路から
なっている。前記第２の発光受光素子２の受光部端子Ｔ
6 と前記第３の発光受光素子３の受光部端子Ｔ7 とを入
力端子とするＡＮＤ回路と、前記第１の発光受光素子１
の受光部端子Ｔ5 と、前記ＡＮＤ回路の出力端子とを入
力端子とするＮＯＲ回路とからなる。前記ＮＯＲ回路出
力で断線検出する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An encoder disconnection detecting device according to an embodiment of the present invention will now be described with reference to the drawings. FIG. 1 shows an example of connection between the disconnection detection circuit and the encoder detection circuit. 1 is a first light emitting / receiving element, 2 is a second light emitting / receiving element, 3 is a third light emitting / receiving element for detecting an input signal from an encoder,
V1 is a first power supply for supplying power to the encoder, V2 is a second power supply insulated from the signal line, A and B are disconnection detection circuits, and C is an encoder signal detection circuit for inverting the input signal from the encoder. Output encoder detection signal. One ends T 3 of the pair of encoder signal lines are connected to the first power supply V1 via the light emitting unit terminal of the first light emitting and receiving element 1.
The other end T 2 of the encoder signal line is connected to the second light emitting / receiving element 2
Is connected to the first power source V1 via the light emitting unit terminal of the. The light receiving portion terminals T 5 and T 6 of the first light emitting / receiving element 1 and the second light emitting / receiving element 2 are connected to the second power source V2 and the logic circuit D, respectively. The light receiving portion terminal T 7 of the third light emitting / receiving element 3 is connected to the second power source V2 and the logic circuit D. The logic circuit D is composed of an AND circuit and a NOR circuit. Light receiving terminal T of the second light emitting / receiving element 2
AND circuit having 6 and the light receiving portion terminal T 7 of the third light emitting and receiving element 3 as input terminals, and the first light emitting and receiving element 1
A light receiving unit terminal T 5 of, and a NOR circuit to the input terminal and the output terminal of the AND circuit. A disconnection is detected by the output of the NOR circuit.
【０００７】次に動作を説明する。Ｅはエンコーダ出力
回路でありＴＲ１が、ＯＮでＴＲ２がＯＦＦの時、信号
線１、２間の論理レベルがハイになり発光受光素子３が
ＯＮしてエンコーダ検出信号の論理レベルがローにな
る。ＴＲ１がＯＦＦでＴＲ２がＯＮの時、信号線１、２
間の論理レベルがローになり発光受光素子がＯＦＦして
エンコーダ検出信号の論理レベルがハイになる。Ａは信
号線２に接続しており信号線２が断線した場合、発光受
光素子１がＯＦＦして断線検出信号１の論理レベルがハ
イになる。Ｂは信号線１に接続しており信号線１が断線
した場合と信号線１、２間がハイになった時に断線検出
信号２の論理レベルがハイになる。従って断線検出の条
件は前記断線検出信号１がハイまたは前記エンコーダ検
出信号と前記断線検出信号２が共にハイの場合となる。
論理回路Ｄは上記断線検出の条件を、組み合わせ回路に
て実現している。図２は本発明における各部の動作波形
を示す。ＮＯＲ回路出力の断線検出信号３は論理レベル
がローの時、断線検出状態である。Next, the operation will be described. E is an encoder output circuit, and when TR1 is ON and TR2 is OFF, the logic level between the signal lines 1 and 2 becomes high, the light emitting and receiving element 3 becomes ON, and the logic level of the encoder detection signal becomes low. When TR1 is OFF and TR2 is ON, signal lines 1 and 2
The logic level between them becomes low, the light emitting and receiving elements are turned off, and the logic level of the encoder detection signal becomes high. A is connected to the signal line 2, and when the signal line 2 is disconnected, the light emitting and receiving element 1 is turned off and the disconnection detection signal 1 has a high logic level. B is connected to the signal line 1 and the logic level of the disconnection detection signal 2 becomes high when the signal line 1 is disconnected and when the signal lines 1 and 2 become high. Therefore, the disconnection detection condition is that the disconnection detection signal 1 is high or both the encoder detection signal and the disconnection detection signal 2 are high.
The logic circuit D realizes the above disconnection detection condition by a combination circuit. FIG. 2 shows operation waveforms of each part in the present invention. The disconnection detection signal 3 output from the NOR circuit is in the disconnection detection state when the logic level is low.
【０００８】[0008]
【発明の効果】以上述べたように本発明によればコンプ
リメンタリ方式のエンコーダにおいて動作時、及び停止
時いずれの場合でも、常に少なくともいずれか一方の入
力線が断線すれば断線検出が可能であり、しかも簡単な
回路構成で信号線からのノイズを受けないエンコーダの
断線検出装置を提供することができる。As described above, according to the present invention, the disconnection can be detected if at least one of the input lines is always disconnected, regardless of whether the complementary type encoder is operating or stopped. Moreover, it is possible to provide an encoder disconnection detection device that does not receive noise from the signal line with a simple circuit configuration.
【図１】本発明の実施例を示すエンコーダの断線検出装
置。FIG. 1 is a disconnection detection device for an encoder according to an embodiment of the present invention.
【図２】本発明における入力及び出力信号の動作状態を
示す波形図。FIG. 2 is a waveform diagram showing operating states of input and output signals in the present invention.
１ 第１の発光受光素子 ２ 第２の発光受光素子 ３ 第３の発光受光素子 Ｔ1 、Ｔ4 エンコーダの電源端子 Ｔ2 、Ｔ3 エンコーダの出力信号線端子 Ｔ5 第１の発光受光素子の受光部端子 Ｔ6 第２の発光受光素子の受光部端子 Ｔ7 第３の発光受光素子の受光部端子 Ａ、Ｂ 断線検出回路 Ｃ エンコーダの信号検出回路 Ｄ 論理回路 Ｅ エンコーダ出力回路 Ｖ１ 第１の電源 Ｖ２ 第２の電源1 First light emitting / receiving element 2 Second light emitting / receiving element 3 Third light emitting / receiving element T 1 , T 4 Encoder power supply terminal T 2 , T 3 Encoder output signal line terminal T 5 First light emitting / receiving element Light receiving section terminal T 6 Light receiving section terminal of second light emitting and receiving element T 7 Light receiving section terminal of third light emitting and receiving element A, B Disconnection detection circuit C Encoder signal detection circuit D Logic circuit E Encoder output circuit V1 First Power supply V2 Second power supply
Claims (1)
いて、 発光部の一端を第１の電源Ｖ１に接続し、前記発光部の
他端をエンコーダの信号線の一端Ｔ3 に接続した第１の
発光受光素子１と、 発光部の一端を前記第１の電源Ｖ１に接続し、前記発光
部の他端を前記エンコーダの信号線の他端Ｔ2 に接続し
た第２の発光受光素子２と、 発光部の両端をそれぞれ前記エンコーダの信号線の他端
Ｔ2 、一端Ｔ3 に接続した第３の発光受光素子３と、 前記第１の発光受光素子１と前記第２の発光受光素子２
と前記第３の発光受光素子３の各々の受光部端子Ｔ5 、
Ｔ6 、Ｔ7 に共通に接続された第２の電源Ｖ２と、 前記第２の発光受光素子２の受光部端子Ｔ6 と前記第３
の発光受光素子３の受光部端子Ｔ7 とを入力端子とする
ＡＮＤ回路と、 前記第１の発光受光素子１の受光部端子Ｔ5 と前記ＡＮ
Ｄ回路の出力端子とを入力端子とするＮＯＲ回路とから
なるエンコーダの断線検出装置。1. In a complementary encoder, a first light emitting / receiving element 1 in which one end of a light emitting portion is connected to a first power source V1 and the other end of the light emitting portion is connected to one end T 3 of a signal line of the encoder. A second light emitting / receiving element 2 in which one end of the light emitting portion is connected to the first power source V1 and the other end of the light emitting portion is connected to the other end T 2 of the signal line of the encoder, and both ends of the light emitting portion A third light emitting / receiving element 3 connected to the other end T 2 and one end T 3 of the signal line of the encoder, the first light emitting / receiving element 1 and the second light emitting / receiving element 2 respectively.
And a light receiving portion terminal T 5 of each of the third light emitting and receiving elements 3,
T 6, T 7 and a second power supply V2, which are connected in common to the said second light receiving section terminal T 6 of the light-emitting light-receiving element 2 3
AND circuit using the light receiving portion terminal T 7 of the light emitting and receiving element 3 as an input terminal, the light receiving portion terminal T 5 of the first light emitting and receiving element 1 and the AN
A disconnection detecting device for an encoder, which comprises a NOR circuit having an output terminal of the D circuit as an input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6275816A JPH08114466A (en) | 1994-10-14 | 1994-10-14 | Wire breakdown detector for encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6275816A JPH08114466A (en) | 1994-10-14 | 1994-10-14 | Wire breakdown detector for encoder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08114466A true JPH08114466A (en) | 1996-05-07 |
Family
ID=17560829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6275816A Pending JPH08114466A (en) | 1994-10-14 | 1994-10-14 | Wire breakdown detector for encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08114466A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267840A (en) * | 2007-04-16 | 2008-11-06 | Fuji Electric Holdings Co Ltd | Encoder wire break detector |
-
1994
- 1994-10-14 JP JP6275816A patent/JPH08114466A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008267840A (en) * | 2007-04-16 | 2008-11-06 | Fuji Electric Holdings Co Ltd | Encoder wire break detector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1296301B1 (en) | Fire alarm system, fire sensor, fire receiver, and repeater | |
| US6225912B1 (en) | Light-emitting diode array | |
| US6888454B2 (en) | Fault diagnosis circuit for LED indicating light | |
| ES2325691T3 (en) | APPARATUS AND METHOD FOR INTERCONNECTION VERIFICATION. | |
| JPH05196677A (en) | Fault detecting device of driving circuit | |
| US6236036B1 (en) | Multi-optical-path photoswitch with capability of detecting multiple light emission | |
| JPH08114466A (en) | Wire breakdown detector for encoder | |
| CN108958141B (en) | Real-time detection method and circuit for broken line of digital input circuit | |
| KR101950604B1 (en) | Disconnection detection apparatus | |
| KR20000005782A (en) | Test arrangement for bonding pad | |
| US6696851B2 (en) | Reception line break detection apparatus | |
| JP2002122626A (en) | State monitor | |
| JPH0831788B2 (en) | Two-terminal network optical sensor | |
| KR200306492Y1 (en) | Digital input line disconnection check circuit | |
| JPS6145494Y2 (en) | ||
| JPH0342538Y2 (en) | ||
| JPH0887422A (en) | Digital signal circuit | |
| JPH01302180A (en) | Disconnection detecting system | |
| JP2561503B2 (en) | Lamp driver | |
| KR19990066996A (en) | Failure of electronic sensor | |
| JPH08102363A (en) | Lighting system | |
| JP2000134291A (en) | Trunk line state detection device | |
| JPH0376712B2 (en) | ||
| JP3704560B2 (en) | Multi-axis projector | |
| JPH06500675A (en) | Circuit device equipped with means for detecting disconnection in a load circuit |