JPS61160587U - - Google Patents
Info
- Publication number
- JPS61160587U JPS61160587U JP4256385U JP4256385U JPS61160587U JP S61160587 U JPS61160587 U JP S61160587U JP 4256385 U JP4256385 U JP 4256385U JP 4256385 U JP4256385 U JP 4256385U JP S61160587 U JPS61160587 U JP S61160587U
- Authority
- JP
- Japan
- Prior art keywords
- zener diode
- zener
- voltage
- line
- diode
- 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.)
- Granted
Links
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Alarm Systems (AREA)
- Fire Alarms (AREA)
Description
図面は本考案の実施例の回路図であり、１は監
視部、ＩＮ１，ＩＮ２は入力端子、ＯＵＴは出力
端子、Ｔｒ１，Ｔｒ２はトランジスタ、Ｌ１，Ｌ
２，Ｌ３は回線、ＺＤ１，ＺＤ１′，ＺＤ２，Ｚ
Ｄ２′，ＺＤ３はエナーダイオード、Ｓ１，Ｓ２
はスイツチ接点、Ｖｃｃは直流電源である。
The drawing is a circuit diagram of an embodiment of the present invention, where 1 is a monitoring section, IN1 and IN2 are input terminals, OUT is an output terminal, Tr 1 and Tr 2 are transistors, and L 1 and L
2 , L 3 are lines, ZD 1 , ZD 1 ′, ZD 2 , Z
D 2 ′, ZD 3 are ener diodes, S 1 , S 2
is a switch contact, and Vcc is a DC power supply.
Claims (1)
定常時に出力端子を“Ｌ”に、断線監視時に“Ｈ
”に夫々設定する監視部と、第１の回線の終端と
第２の回線の終端との間に接続される第１のツエ
ナーダイオードと、入力端子に対して並列に接続
された第２のツエナーダイオードと、出力端子が
“Ｈ”のときオンするスイツチ素子と、該スイツ
チ素子のオン時に第１の回線、第１のツエナーダ
イオードを介して第２のツエナーダイオードに電
圧を印加する直流電源と、上記スイツチ素子がオ
フ時に第１の回線、第１のツエナーダイオードを
介して第２のツエナーダイオードに並列に接続さ
れるとともに上記直流電源電圧を所定電圧に降圧
する第３のツエナーダイオードとを備えるととも
に、両回線間に感知器等のスイツチ接点を接続し
、上記直流電源電圧に対して第１のツエナーダイ
オードのツエナー電圧を低く設定し、第３のツエ
ナーダイオードのツエナー電圧を第１のツエナー
ダイオードのツエナー電圧以下に設定し、更に第
２のツエナーダイオードのツエナー電圧を第３の
ツエナー電圧より低く設定し且つ第１のツエナー
ダイオードのツエナー電圧と第２のツエナーダイ
オードのツエナー電圧との和の値よりと直流電源
電圧を大きく設定し、定常時及び断線監視時に入
力端子のレベルによりスイツチ接点の状態及び回
線の状態を監視部で監視することを特徴とする回
線監視回路。 An output terminal and at least one input terminal are provided, and the output terminal is set to "L" during normal operation, and set to "H" during disconnection monitoring.
a first Zener diode connected between the end of the first line and the end of the second line, and a second Zener diode connected in parallel to the input terminal. a diode, a switch element that is turned on when the output terminal is "H", and a DC power supply that applies voltage to the second Zener diode through the first line and the first Zener diode when the switch element is turned on; and a third Zener diode that is connected in parallel to the second Zener diode via the first line and the first Zener diode when the switch element is off, and that reduces the DC power supply voltage to a predetermined voltage; , a switch contact such as a sensor is connected between both lines, the Zener voltage of the first Zener diode is set lower than the DC power supply voltage, and the Zener voltage of the third Zener diode is set to be lower than that of the first Zener diode. The Zener voltage of the second Zener diode is set lower than the Zener voltage of the second Zener diode, and the Zener voltage of the second Zener diode is set lower than the Zener voltage of the first Zener diode and the Zener voltage of the second Zener diode. A line monitoring circuit characterized in that a DC power supply voltage is set to a large value, and a monitoring unit monitors the state of a switch contact and the state of a line according to the level of an input terminal during steady state and during disconnection monitoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4256385U JPH0342540Y2 (en) | 1985-03-25 | 1985-03-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4256385U JPH0342540Y2 (en) | 1985-03-25 | 1985-03-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61160587U true JPS61160587U (en) | 1986-10-04 |
| JPH0342540Y2 JPH0342540Y2 (en) | 1991-09-05 |
Family
ID=30553434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4256385U Expired JPH0342540Y2 (en) | 1985-03-25 | 1985-03-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0342540Y2 (en) |
-
1985
- 1985-03-25 JP JP4256385U patent/JPH0342540Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0342540Y2 (en) | 1991-09-05 |