Programmable controller module identification system

Details Programmable controller module identification system Programmable controller module identification system

G - Physics

06

F

354/230.3

G06F 13/10 (2006.01) G05B 19/04 (2006.01) G05B 19/05 (2006.01) G06F 15/177 (2006.01)

Patent

CA 1318406

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.

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