EP0552619B1 - Meldungserfassungsschaltung für ein Meldesignal - Google Patents

Meldungserfassungsschaltung für ein Meldesignal Download PDF

Info

Publication number: EP0552619B1
Authority: EP; European Patent Office
Prior art keywords: signal; circuit; event; control; processing device
Prior art date: 1992-01-22
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.): Expired - Lifetime

Application number

EP93100224A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0552619A3 (en

EP0552619A2 (de

Inventor

Kurt Dipl.-Ing. Smutny

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Siemens AG

Original Assignee

Siemens AG

Priority date (The priority date 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 date listed.)

1992-01-22

Filing date

1993-01-08

Publication date

1997-07-30

1993-01-08 Application filed by Siemens AG filed Critical Siemens AG

1993-07-28 Publication of EP0552619A2 publication Critical patent/EP0552619A2/de

1993-12-15 Publication of EP0552619A3 publication Critical patent/EP0552619A3/de

1997-07-30 Application granted granted Critical

1997-07-30 Publication of EP0552619B1 publication Critical patent/EP0552619B1/de

2013-01-08 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
- H01H9/167—Circuits for remote indication

Definitions

the invention relates to a message detection circuit for a signal that can be generated by a signal contact, with a plurality of signal contacts supplied by a direct source, which are connected to a multiplexer circuit, which can be followed by a control and processing device.
a circuit arrangement of the type mentioned at the outset is known from EP 0 249 410 A1.
the circuit arrangement shown there does not have a potential separation point, so that use under interference voltage conditions, such as, for example, in medium-voltage or high-voltage systems, is not possible.
a reference voltage is compared with the potential via a make contact of the mains switch.
the invention is based on the object of specifying a detection circuit of the type mentioned at the outset in which the disadvantages mentioned above are avoided and despite reliable switching states at a signaling contact a reliable message detection is given.
a signal formed by the signaling contact which is unclear due to ambiguous switching states at the signaling contact, is converted into a unique signaling signal.
Unclear switching states on the signaling contact can result, for example, from aging and the formation of leakage resistances arise at the signaling contact.
the comparison circuit can be designed in the manner of a measuring bridge, the signaling contact being in a path of a resistance measuring bridge.
the reference signal is generated by the DC voltage source. This results in a particularly simple design of the detection circuit.
the signals formed by the signaling contacts are routed to a multiplexer circuit, the output of which is connected to the signal input of the comparison circuit.
the circuitry complexity is greatly reduced. Common processing is provided for all channels of the detection circuit.
the parallel structure of the registration is reduced to a series structure.
a DC signal generated by the DC source is also routed to a channel of the multiplexer circuit and serves as an information signal.
the DC signal can serve as an information pulse within the signal telegram formed by the multiplexer.
it can also serve as information as to whether the voltage supply required for the signaling contact, i.e. the direct signal, is present at all.
the multiplexer circuit can be followed by a potential isolator, which is led to a control and processing device. Compared to previous versions, only one potential isolator needs to be provided for all signaling channels in this way. This drastically reduces the number of optocouplers used. A failure of the potential isolating element can also be detected at the same time by scanning the DC signal.
a synchronization signal can be passed from the control and processing device to the multiplexer circuit via the first or a second potential isolating element. This also enables a synchronized detection of the alarm signals.
the detection circuit is preferably designed as a module, in particular as a digital input module of a signaling system or a programmable control device.
the control and processing device preferably has a processor.
the 1 shows a detection circuit 1a for a signaling channel a.
the signaling channel a has a signaling contact 3a, which is connected to a DC voltage source 5.
the area A can be assigned to a system, in particular a switchgear of a power supply network, in which a predetermined event or information is to be recorded by means of the signaling contact 3a.
the area B can be at a central point, separate from the location of the message acquisition, e.g. be arranged in a control room.
C denotes an interface which is designed, for example, as a distribution distributor.
a signal generated by the signaling contact 3a is fed to an input of a comparator 7.
a second entrance to the Comparator 7 is supplied with a reference signal.
the reference signal is generated by a voltage divider 9 formed by resistors. This can be supplied by a voltage supply 11 or alternatively also directly by the DC voltage source 5.
the signal of the signaling contact 3a can be routed to the comparator 7 via a network 13a.
the network 13a essentially comprises a voltage divider and / or an RC element.
Additional signaling contacts 3b to 3n with respective networks 13b to 13n are provided to form a plurality of signaling channels a to n.
7 switching elements 15a to 15n are arranged between the networks 13a to 13n and the input of the comparator and are cyclically switched through by a control unit 17.
the switching elements 15a to 15n together with the control unit 17 form a multiplexer circuit. In this way, only one comparator 7 needs to be used for n signaling channels.
message channel b is used to include the message voltage in the message processing. This also provides information as to whether the signaling voltage is present. It goes without saying, of course, that the other devices of the detection circuit are supplied by an energy supply that operates independently of the DC voltage source 5.
a comparator 7 is followed by a driver 19 which is connected to an optocoupler 21 serving as a potential isolator.
the optocoupler 21 separates the potential of the detection circuit 1a, which may be subject to interference signals, from the potential of the further processing devices.
the optocoupler 21 is on the output side with a Control and processing device 23 connected, which carries out the further processing of the received signal signals.
the control and processing device 23 preferably has a processor 24.
the control and processing device 23 receives a telegram-like signal.
the control and processing device 23 can transmit a synchronization signal to the plexer circuit. This is preferably done via a second optocoupler 25.
the two optocouplers 21 and 25 can also be formed by a common component.
control and processing device 23 can have an output 27, which can be designed, for example, as a serial interface or as a bus connection within a higher-level control system.
the detection circuit 1 a can preferably be designed as an input module 29, in particular as a digital input module of a processor system.
Such assemblies usually have, for example, 16 or 32 signaling channels. It is used in particular in control and signaling devices for medium and high voltage systems.

Landscapes

Circuits Of Receivers In General (AREA)
Monitoring And Testing Of Exchanges (AREA)
Alarm Systems (AREA)
Radar Systems Or Details Thereof (AREA)
Burglar Alarm Systems (AREA)
Arrangements For Transmission Of Measured Signals (AREA)
Analogue/Digital Conversion (AREA)
Facsimiles In General (AREA)

EP93100224A 1992-01-22 1993-01-08 Meldungserfassungsschaltung für ein Meldesignal Expired - Lifetime EP0552619B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE4201630		1992-01-22
DE4201630		1992-01-22

Publications (3)

Publication Number	Publication Date
EP0552619A2 EP0552619A2 (de)	1993-07-28
EP0552619A3 EP0552619A3 (en)	1993-12-15
EP0552619B1 true EP0552619B1 (de)	1997-07-30

Family

ID=6450020

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP93100224A Expired - Lifetime EP0552619B1 (de)	1992-01-22	1993-01-08	Meldungserfassungsschaltung für ein Meldesignal

Country Status (4)

Country	Link
EP (1)	EP0552619B1 (no)
AT (1)	ATE156297T1 (no)
DE (1)	DE59306987D1 (no)
NO (1)	NO306430B1 (no)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5488323A (en) *	1994-12-14	1996-01-30	United Technologies Corporation	True hysteresis window comparator for use in monitoring changes in switch resistance
DE10333911B3 (de) *	2003-07-25	2005-06-02	Diehl Ako Stiftung & Co. Kg	Kaskadierbare Anordnung von Schaltersätzen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS58141029A (ja) *	1982-02-16	1983-08-22	Fuji Facom Corp	受信回路
GB8614198D0 (en) *	1986-06-11	1986-07-16	Salplex Ltd	Information handling & control systems
US4777479A (en) *	1987-04-03	1988-10-11	Unisys Corporation	Switch position indicator

1993
- 1993-01-08 DE DE59306987T patent/DE59306987D1/de not_active Expired - Fee Related
- 1993-01-08 EP EP93100224A patent/EP0552619B1/de not_active Expired - Lifetime
- 1993-01-08 AT AT93100224T patent/ATE156297T1/de not_active IP Right Cessation
- 1993-01-21 NO NO930204A patent/NO306430B1/no unknown

Also Published As

Publication number	Publication date
NO930204D0 (no)	1993-01-21
EP0552619A3 (en)	1993-12-15
NO306430B1 (no)	1999-11-01
EP0552619A2 (de)	1993-07-28
DE59306987D1 (de)	1997-09-04
ATE156297T1 (de)	1997-08-15
NO930204L (no)	1993-07-23

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