JPH0397709U - - Google Patents
Info
- Publication number
- JPH0397709U JPH0397709U JP696690U JP696690U JPH0397709U JP H0397709 U JPH0397709 U JP H0397709U JP 696690 U JP696690 U JP 696690U JP 696690 U JP696690 U JP 696690U JP H0397709 U JPH0397709 U JP H0397709U
- Authority
- JP
- Japan
- Prior art keywords
- input
- output
- output circuit
- light emitting
- display device
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Programmable Controllers (AREA)
Description
第１図は本考案による入出力回路の表示装置の
一実施例を示す結線図、第２図は従来の入出力回
路の表示装置の結線図である。
１……出力回路、１ａ〜１ｎ……出力端、１ｏ
……ＬＥＤＭ端、４ａ〜４ｎ……発光ダイオード
、７ａ〜７ｎ……ダイオード、８……オープンコ
レクタトランジスタ、９……テストスイツチ。
FIG. 1 is a wiring diagram showing an embodiment of a display device for an input/output circuit according to the present invention, and FIG. 2 is a wiring diagram for a conventional display device for an input/output circuit. 1... Output circuit, 1a to 1n... Output end, 1o
...LEDM end, 4a to 4n...Light emitting diode, 7a to 7n...Diode, 8...Open collector transistor, 9...Test switch.
Claims (1)
の入力端または出力端にそれぞれ発光素子を接続
して前記入力端または出力端に現われる信号を前
記発光素子により表示する入出力回路の表示装置
であつて、前記各発光素子のカソードにそれぞれ
ダイオードのアノードを接続し、このダイオード
のカソードを共通に接続するとともにこの共通接
続点と前記入出力回路の１つの入力端または出力
端との間にオープンコレクタトランジスタを接続
し、前記共通接続点とアースとの間にテストスイ
ツチを接続したことを特徴とする入出力回路の表
示装置。 A display device for an input/output circuit, wherein a light emitting element is connected to each input end or output end of an input/output circuit having a plurality of input ends or output ends, and a signal appearing at the input end or output end is displayed by the light emitting element. An anode of a diode is connected to the cathode of each of the light emitting elements, and the cathodes of the diodes are connected in common, and an open collector is connected between this common connection point and one input terminal or output terminal of the input/output circuit. 1. A display device for an input/output circuit, characterized in that a transistor is connected and a test switch is connected between the common connection point and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP696690U JPH0397709U (en) | 1990-01-26 | 1990-01-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP696690U JPH0397709U (en) | 1990-01-26 | 1990-01-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0397709U true JPH0397709U (en) | 1991-10-08 |
Family
ID=31510635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP696690U Pending JPH0397709U (en) | 1990-01-26 | 1990-01-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0397709U (en) |
-
1990
- 1990-01-26 JP JP696690U patent/JPH0397709U/ja active Pending
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