Processor for a programmable controller

Details Processor for a programmable controller Processor for a programmable controller

1992-12-29

1993-11-23

Smith, Jerry

Boots, shoes, and leggings

364136, 3649269, 364949, 364DIG2, G05B 1900

Patent

active

052650057

ABSTRACT:
A programmable controller has a rack that electrically connects a number of I/O modules to a processor module. The processor module includes a external device communication interface section and a general purpose processor section electrically coupled together by a set of common buses. Both of these module sections include a microprocessor and memory connected by an internal set of buses which are isolatable from the set of common buses. The isolation capability permits the different sections to perform their operations simultaneously. A shared system memory and an rack interface are coupled to the common buses for the exchange of data with the I/O modules. A unique ladder logic processor also is connected directly to the common buses. The ladder logic processor includes a hardwired Boolean bit logic processor and a custom microcoded processor to execute instructions of a ladder type control program. Program instructions which are too complex for execution by the ladder logic processor are executed by the general purpose processor section.

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Excerpt from Motorola MC86020 32-Bit Microprocessor User's Manual, Second Edition, 1985, pp. 1-1, 1-2.
Motorola MC68881 Floating-Point Coprocessor User's Manual, First Edition, 1985, pp. 1-6-1-7.

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