Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Reexamination Certificate
1999-07-22
2001-03-06
Sircus, Brian (Department: 2839)
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
C439S633000
Reexamination Certificate
active
06196881
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a device for coding plug receptacles.
BACKGROUND INFORMATION
A device for the connection of external lines to a programmable logic controller is described in German Patent No. 43 23 440 A1, the device being coupled to the programmable logic controller for signal transmission and being capable of being installed separately from it. The terminal unit allows for a modular structure in which a terminal is available for each actuator/sensor connection, it being correspondingly possible to provide each connection type with an electronic module for signal conversion. Input and output modules can thus be mixed as desired. This has an advantageous effect on project planning, installation, troubleshooting or expansion of the electronic device. At the same time, the terminal unit functions as a support unit for the electronic modules and has a plurality of identical plug receptacles for them. Both feeder and signal lines are connected to the electronic modules via a plug-in connector at the plug receptacle. Electronic modules with different operating voltages, e.g., 230 V alternating current or 24 V direct current, can be used. The wiring via the plug-in connector at the plug receptacle does indeed facilitate the replacement of electronic modules; however, at the same time. It also increases the risk of confusing them. This can result in problems, since the particular type of the electronic module to be inserted in a plug receptacle, its supply voltage in particular, is determined after wiring of the device for the connection of external lines has been completed.
SUMMARY
An object of the present invention is to create a device for the coding of plug receptacles which prevents electronic modules from being inserted into plug receptacles for which they are not suitable.
The present invention has the advantage that in addition to the support unit and electronic modules, no additional parts are needed for the coding. The coding slide is fixedly attached to the support unit and can thus not become lost during transport or startup of the device for the connection of external lines. Only one recess is provided on the electronic modules for coding at the time of manufacture, which causes no additional expense. If the wiring of the device is modified for the connection of external lines, the position of the slide can be adjusted easily so that the advantage of free interchangeability of electronic modules in the plug receptacles of the support unit is preserved even after modifications. Making it possible to adjust the slide only with a tool rules out unintentional manipulations when handling the support unit. A position of the coding slide in which no module can be inserted into the particular plug receptacle is advantageous. When the unit is delivered, all coding slides of the support unit are in this position. This ensures that the user must consciously match the coding slide to the selected wiring after the completion of wiring. After that, the correct module type can be inserted into the plug receptacles. In an advantageous manner, the device for coding plug receptacles requires no interfering parts projecting out of the support unit if the pins project into insertion slots on the plug receptacles.
In order to increase the number of code variants at a plug receptacle, coding slides with a plurality of lock-in positions, or several coding slides, can be used for one plug receptacle, offering a large number of possible combinations.
REFERENCES:
patent: 4307927 (1981-12-01), Mollman
patent: 4579412 (1986-04-01), Czeschka et al.
patent: 4595250 (1986-06-01), Joly et al.
patent: 5402320 (1995-03-01), Kielstra et al.
patent: 586 962 (1977-04-01), None
patent: 607 542 (1978-12-01), None
patent: 28 07 017 (1979-08-01), None
patent: 37 25 498 (1989-02-01), None
patent: 38 30 187 (1990-03-01), None
patent: 43 23 440 (1995-02-01), None
patent: 44 20 984 (1995-12-01), None
Abert Michael
Balzer Kurt
Morlock Siegfried
Kenyon & Kenyon
Nguyen Son V.
Siemens Aktiengesellschaft
Sircus Brian
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