EP 0090399 B1 19861120 - DIRECT CURRENT SIGNALLING INSTALLATION
Title (en)
DIRECT CURRENT SIGNALLING INSTALLATION
Publication
Application
Priority
DE 3211550 A 19820329
Abstract (en)
[origin: EP0090399A1] 1. A direct current signalling installation having at least one two-wire signalling line (ML) which emanates from a central unit (Z) and to which is connected a plurality of signal units (Ml to Mn), each with at least one series resistor (R) in the signalling line (ML) and a signalling switch (S) arranged parallel to the signalling line (ML), by means of which switch (S) the respective resistance value can be suddenly changed, where in order to determine the momentary resistance value of the respective signalling line (ML) the central unit (Z) is provided with a measuring device (ME) and an analysing device (AW) which follows the latter and which determines the alarm-triggering signal from the momentary resistance value of the respective signalling line (ML) and comparison values which correspond to the triggering of the individual signals, characterised in that each signal unit (M1 to Mn) only has one resistor (R) arranged in series in the signalling line (ML), that the signalling switch (S) is directly connected between the two wires of the signalling line (ML), that in the measuring and analysing device (ME/AW) each signal unit (Ml to Mn) is assigned a window discriminator (Dl to Dn), where the comparison value which corresponds to the triggering of the assigned signal unit (Ml to Mn) is formed by a comparison voltage connected to the reference input and a voltage which corresponds to the resistance value of the signalling line supplied to the measuring input, and that the output of each window discriminator (Dl to Dn) leads to a display device (ANZl to AnZn).
IPC 1-7
IPC 8 full level
G08B 25/00 (2006.01); G08B 25/01 (2006.01)
CPC (source: EP)
G08B 25/018 (2013.01)
Designated contracting state (EPC)
AT IT NL
DOCDB simple family (publication)
EP 0090399 A1 19831005; EP 0090399 B1 19861120; AT E23759 T1 19861215; DE 3211550 A1 19831013; DE 3211550 C2 19850214
DOCDB simple family (application)
EP 83103070 A 19830328; AT 83103070 T 19830328; DE 3211550 A 19820329