发明名称 |
Reliability and workability test apparatus for an environmental monitoring system |
摘要 |
An environmental monitoring system in which a controller is arranged to test the workability and reliability of a plurality of detector units on a cyclic basis. Each unit has an analog sensor and an analog to digital converter for converting the analog sensor voltage to a digital value in a range of 0 to N. Each unit responds to a test instruction to cause the sensor analog output to assume an alarm value. The sensor output is limited to a maximum value that under a no drift condition of the analog to digital converter, its corresponding digital signal value will be intermediate a tolerance range of values, the upper limit of such range being less than N. The controller includes a test routine program for both issuing the test instruction and for determining if the digital signal test value is within the tolerance range and issuing a trouble output indicative of the test value being outside the range. The controller also includes a polling program which directs the polling of the detector units such that a test instruction is sent sequentially to the detector units on successive loop polls, where a loop poll is one poll of all the units coupled to the line.
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申请公布号 |
US4962368(A) |
申请公布日期 |
1990.10.09 |
申请号 |
US19890347543 |
申请日期 |
1989.05.04 |
申请人 |
GENERAL SIGNAL CORPORATION |
发明人 |
DOBRZANSKI, JOHN J.;MCCABE, JEFFREY J.;RIGHT, ROBERT W. |
分类号 |
G08B26/00;G08B29/14 |
主分类号 |
G08B26/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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