Programmable controller module identification by interconnecting

Details Programmable controller module identification by interconnecting Programmable controller module identification by interconnecting

1990-07-06

1993-12-28

Lee, Thomas C.

Boots, shoes, and leggings

3649294, 36494061, 36494251, 3649464, 3649475, 364949, 3649494, 364DIG2, 395800, G06F 900

Patent

active

052747816

ABSTRACT:
A programmable controller includes a processor module and a number of input/output modules housed in a rack. Each input/output module contains a circuit that identifies characteristics of the module to the processor module. The circuit has a parallel input port and a parallel output port The outputs and inputs of the two ports are interconnected in a predefined manner according to the module characteristics. In addition, inputs of the input port are coupled to either a positive or negative voltage source to identify other module characteristics. By sequentially sending data to the output port and then reading data from the input port of each input/output module, the processor can identify the characteristics of the modules in the programmable controller.

REFERENCES:
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patent: 4165534 (1979-08-01), Dummermuth et al.
patent: 4263650 (1981-04-01), Bennett et al.
patent: 4442504 (1984-04-01), Dummermuth et al.
patent: 4807161 (1989-02-01), Comfort et al.
patent: 4849931 (1989-07-01), Ishii et al.

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