Circuit arrangement for the automatic function-che

专利名称：Circuit arrangement for the automatic

function-checking of a monitoring device

发明人：WENTER, PETER申请号：EP88106147.7申请日：19880418公开号：EP0287991A1公开日：19881026

专利附图：

摘要：The arrangement is for optical signal systems with a test system (PRS) whichsimulates faults by appropriately influencing (BE) the monitoring unit (UWE). An alarm(ALA) thereby triggered is suppressed during the period of the test. The circuit

arrangement consists of a fail-safe exclusive OR circuit (EXOR) which has a locking (Kl)alarm relay (K) and two pump circuits (A and B) each with an associated capacitor (C3, C4),and an RC element (RI, Cl and R14, C2) fitted in the input circuit and switching transistors(Tl to T6). The pump circuits (A, B) generate the excitation voltage for the alarm relay (K).The first pump circuit (A) receives the alarm signal (ALA) and the second pump circuit (B)receives the alarm suppression signal (ALU). In each case, one pump circuit (A or B)charges its capacitor (C3 or C4) whilst the other pump circuit (B or A) discharges itscapacitor (C4 or C3) via the alarm relay (K), the alarm relay (K) dropping out when thenegative capacitor voltage goes below the drop-out voltage.

申请人：SIEMENS AKTIENGESELLSCHAFT BERLIN UND MUNCHEN

地址：Wittelsbacherplatz 2 80333 München DE

国籍：DE

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