JPS5462798A - Centralized alarm and monitor device - Google Patents
Centralized alarm and monitor deviceInfo
- Publication number
- JPS5462798A JPS5462798A JP12943577A JP12943577A JPS5462798A JP S5462798 A JPS5462798 A JP S5462798A JP 12943577 A JP12943577 A JP 12943577A JP 12943577 A JP12943577 A JP 12943577A JP S5462798 A JPS5462798 A JP S5462798A
- Authority
- JP
- Japan
- Prior art keywords
- input
- trouble
- cpu1
- cpu2
- control 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
Landscapes
- Audible And Visible Signals (AREA)
- Alarm Systems (AREA)
- Selective Calling Equipment (AREA)
Abstract
PURPOSE: To display an alarm even for a trouble occurring and disappearing in a short period of time by providing read-only control device in the case of central control of a pair of trouble detector group and display device by sequential scanning method.
CONSTITUTION: A read-only control device CPU2 generates interrupt signals to a central control device CPU1 at proper intervals of time, and scans all input ports I of trouble detectors D1 to Dn at high speed within the interruption period, thereby recording presence or absence of input (trouble detection signals) to the corresponding addresses of memory RAM. The CPU1 sequentially reads the contents in each address of RAM during the interrupt signal period given by the CPU2, and sends control signals to corresponding display lamps L1 to Ln. The CPU2 counts the interrupt signals in a label counter of proper counting range, and when inputs are applied to input port I, the counting output, together with the input signal, is written into the corresponding address of RAM. Comparing with the counting output read out at each scanning, when the outputs are in coincidence, the address contents is made to 0, as far as there is no input in the corresponding input point. Therefore, the input is maintained during the period of several scannings, so that the input may not escape the reading of CPU1.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12943577A JPS5462798A (en) | 1977-10-27 | 1977-10-27 | Centralized alarm and monitor device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12943577A JPS5462798A (en) | 1977-10-27 | 1977-10-27 | Centralized alarm and monitor device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5462798A true JPS5462798A (en) | 1979-05-21 |
Family
ID=15009399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12943577A Pending JPS5462798A (en) | 1977-10-27 | 1977-10-27 | Centralized alarm and monitor device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5462798A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58116897A (en) * | 1981-12-29 | 1983-07-12 | Matsushita Electric Works Ltd | Time-division multiplex transmission system |
-
1977
- 1977-10-27 JP JP12943577A patent/JPS5462798A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58116897A (en) * | 1981-12-29 | 1983-07-12 | Matsushita Electric Works Ltd | Time-division multiplex transmission system |
JPS6340079B2 (en) * | 1981-12-29 | 1988-08-09 | Matsushita Electric Works Ltd |
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