Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral configuration
Patent
1997-05-07
1999-08-10
Kizou, Hassan
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral configuration
710 46, 370340, 34082508, G06F 300
Patent
active
059352221
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for identifying installed plug-in devices, and in particular to an arrangement for identifying installed plug-in devices attached to a decentralized peripheral system.
BACKGROUND OF THE INVENTION
In modular automation systems, it is desirable to adapt the input and output components of the system to the conditions prevailing in a given industrial process with regard to the use of actuators and sensors. To do so, the CPU of the system must determine the type of configuration to determine the consistency between a projected structure assumed in the user program and the actual structure, e.g. for diagnostic purposes. International patent application WO 94/15299 describes an arrangement with a CPU that detects whether functional units have been plugged into the module slots of the arrangement. For this purpose, the plug-in units have level switching devices that switch the level of the address line assigned to them in the event the units receive a module slot identification signal from the CPU during the read access time.
To reduce the number of input and output components installed in automation systems despite a high degree of expansion, decentralized peripheral systems are used, e.g., in the form of an "active terminal." A case with peripheral modules is moved to the process actuators and sensors, and only one interface module, which is connected to the decentralized peripheral system by a cable, is necessary in the automation unit. The arrangement proposed in international patent application WO 94/15299 can detect whether the interface connection is plugged into a module slot in the automation unit, but it cannot recognize whether the peripheral modules are present in the decentralized peripheral system.
The object of the present invention is to create an arrangement of the type defined in the preamble, wherein an installed or plug-in functional unit can be identified. In addition, an identifiable functional unit is to be created that can be identified even if it is set up at a separate location from its signal processing connection.
Additional embodiments of the present invention are derived from the subclaims.
The device of the functional unit may be designed to be active or passive. An active device has the means for producing an identification signal from a voltage generated in the device itself. A passive device, however, converts a voltage supplied by the signal processing connection into an identification voltage. The voltage of the interface connection and the identification voltage are preferably transmitted over the available signal line.
The present invention as well as embodiments and advantages are explained in greater detail below with reference to the figures, which illustrate one embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a decentralized peripheral system according to the present invention.
FIG. 2 shows a schematic diagram of the signal processing connection of an automation unit according to the present invention with digit input/output unit connected thereto.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a case 1 of a decentralized peripheral system equipped with three rows of orifices 2. These orifices 2 have, for example, screwless spring terminals for connecting external lines that can be released by control orifices 3. Inside case 1 there are installed digital input and output modules 5 whose inputs are connected to cable terminal 4 and whose outputs are connected to orifices 2 by a circuitboard (not shown here) in case 1. Orifices for potential conductors designated as L- and L+ are provided, for example at the left end of a row of orifices 2 and serve to run the potential conductors to a fuse module with a fuse that can be replaced from the front. A ribbon cable that can be connected to cable terminal 4 connects decentralized peripheral system 1 to a signal processing interface connection 7 (FIG. 2) of an automation unit. Each digital input and output module
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Hossain Abu
Kizou Hassan
Siemens Aktiengesellschaft
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