Patent
1995-05-17
1997-02-18
Ray, Gopal C.
395281, G06F 1206, G06F 906, G06F 116
Patent
active
056048726
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns an arrangement with a plurality of plug points and a plurality of plug-in functional units.
In stored-program controls, generally one or more central subassemblies and a plurality of functional subassemblies, for example subassemblies for digital or analog input and output of signals, are interconnected via a system bus having address, data, and control lines. The subassemblies are fitted into plug points of a central or expansion unit, and means for address coding and decoding are provided in order for the functional subassemblies to be addressed by the central subassemblies during read or write functions.
To allow address coding to be dispensed with, it is proposed in European Patent Application 0 486 818 to provide one line each between a control unit and individual modules of a control system. The control unit addresses the modules by transmitting different data words over these lines. An addressing system of this kind, in an arrangement with plug-in functional units, means that a special plug-in position which executes read and write accesses to other functional units must be provided for the functional unit.
SUMMARY OF THE INVENTION
The present invention provides an arrangement of the aforesaid kind in which a functional unit executing read and write accesses can be fitted into any plug point.
In accordance with the present invention such an arrangement includes a plurality of plug points that are interconnected via a system bus having data and control lines; address lines taken to connections of the plug points, one of which is connected respectively to a selector terminal of a plug point; and plug-in functional units, at least one of which has means for connecting the address lines to this unit, and each of the remaining functional units has means for connecting the unit to the selector terminal of the plug point.
In an embodiment of the invention, in order to transfer subaddresses the plug-in positions are interconnected via an address bus. As a result, for example, different memory regions of the functional units are addressable.
The arrangement according to the present invention is used in particular in a stored-program control, preferably in a stored-program control with a central unit and at least one expansion unit, which are interconnected via a connecting cable which has the system and address bus, the address lines, and further address lines for addressing the expansion unit.
BRIEF DESCRIPTION OF THE DRAWING
The invention and its embodiments and advantages will be explained further with reference to the drawing, in which an exemplary embodiment of the invention is illustrated.
The FIGURE shows a schematic circuit diagram of an arrangement with plug points.
DETAILED DESCRIPTION
SP1-SP4 designate plug-in positions which are interconnected via a system bus SYB having eight data lines and eight control lines. Address lines AL1-AL4 are taken from plug-in position to plug-in position at connecting means of these plug-in positions, of which first address line AL1 is connected, via a line SL1, to a selector terminal AN1 of plug-in position SP1. Address lines AL2, AL3, and AL4 are correspondingly connected via lines SL2, SL3, and SL4 to selector terminals AN2, AN3, and AN4 of plug-in positions SP2, SP3, and SP4. Functional units FE1-FE4 can be fitted arbitrarily into plug points SP1, . . . , for which purpose functional units executing read and write functions must be connectable to all address lines AL1-AL4 in order to address the remaining functional units. In the present example, functional units FE1, FE3 access units FE2, FE4 for read or write purposes. For this purpose, functional units FE1 and FE3 have means, for example in the form of blade or spring contacts, of making a connection V1, V3 to the connection means of the plug points and thus to address lines AL1-AL4. The addressable functional units FE2 and FE4 also have means in the form of a spring or blade contact, by means of which selector terminal AN2, AN4 of plug poin
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Abert Michael
Block Siegfried
Bozenhardt Johannes
Leigsnering Franz
Pfatteicher Werner
Ray Gopal C.
Siemens Aktiengesellschaft
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