JPS6340032U - - Google Patents
Info
- Publication number
- JPS6340032U JPS6340032U JP13411786U JP13411786U JPS6340032U JP S6340032 U JPS6340032 U JP S6340032U JP 13411786 U JP13411786 U JP 13411786U JP 13411786 U JP13411786 U JP 13411786U JP S6340032 U JPS6340032 U JP S6340032U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- input terminal
- input
- prevention diode
- power supply
- 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
- 230000002265 prevention Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
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- Electronic Switches (AREA)
- Dc Digital Transmission (AREA)
- Communication Control (AREA)
Description
第１図は本考案の基本実施例である接点入力用
インターフエースの回路図、第２図はその応用実
施例を示す回路図である。第３図は、従来の接点
用入力用インターフエースを示す回路図である。
２１，３１…接点用入力インターフエース、２
２ａ…入力端子、２３…判定回路、２４…電源、
２５…第１の抵抗、２８…逆流防止ダイオード、
２９…第２の抵抗。
FIG. 1 is a circuit diagram of a contact input interface which is a basic embodiment of the present invention, and FIG. 2 is a circuit diagram showing an applied embodiment thereof. FIG. 3 is a circuit diagram showing a conventional contact input interface. 21, 31...Contact input interface, 2
2a...input terminal, 23...judgment circuit, 24...power supply,
25...First resistor, 28...Backflow prevention diode,
29...Second resistance.
Claims (1)
の入力側、及びツエナーダイオードを、この順に
直列接続して構成した判定回路と、 上記入力端子と上記第１の抵抗のアース側との
間に、入力端子から見て逆方向に接続された逆流
防止ダイオードと、 第１の抵抗の数倍以上の抵抗値を持ち、上記逆
流防止ダイオードの入力端子側と電源間に接続さ
れた第２の抵抗とを具備したことを特徴とする接
点用入力インターフエース。[Scope of Claim for Utility Model Registration] A determination circuit comprising a first resistor, the input side of a photocoupler, and a Zener diode connected in series in this order between an input terminal that receives input from an external contact, a power supply, and ground. , a backflow prevention diode connected in the opposite direction when viewed from the input terminal between the input terminal and the ground side of the first resistor, and a backflow prevention diode having a resistance value several times or more than the first resistor, and A contact input interface comprising a second resistor connected between the input terminal side of the prevention diode and a power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13411786U JPS6340032U (en) | 1986-09-01 | 1986-09-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13411786U JPS6340032U (en) | 1986-09-01 | 1986-09-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6340032U true JPS6340032U (en) | 1988-03-15 |
Family
ID=31035058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13411786U Pending JPS6340032U (en) | 1986-09-01 | 1986-09-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6340032U (en) |
-
1986
- 1986-09-01 JP JP13411786U patent/JPS6340032U/ja active Pending