1
George D Maskovyak: Programmable controller with module identification and diagnostic mechanism. Allen Bradley Company, Quarles & Brady, December 28, 1993: US05274767 (44 worldwide citation)

A programmable controller has a chassis which removably holds a plurality of functional modules. The chassis has a backplane with conductors and connectors that electrically connect the modules. These conductors carry module enable, read, and write control signals, as well as byte addresses and data ...


2
George D Maskovyak: Method and circuit for automatically communicating in two modes through a backplane. Allen Bradley Company, Quarles & Brady, November 12, 1991: US05065314 (27 worldwide citation)

A method and circuitry for communicating both byte transfer I/O data and file transfer I/O data to an individual I/O module through an equipment chassis backplane in a programmable controller. The byte transfer data is real time I/O data representing the status of I/O devices on an industrial machin ...


3
George D Maskovyak, Robert Lantzy Jr: I/O module with multi-function integrated circuits and an isolation interface for multiplexing data between a main processor and I/O devices. Allen Bradley Company, Quarles & Brady, September 13, 1988: US04771403 (26 worldwide citation)

The density of I/O circuits on input and output modules in a programmable controller is doubled, while the number of optically coupled circuits is reduced, by transmitting data serially through one of the optically coupled circuits. Optically coupled circuits are also used for address and test signa ...


4
George D Maskovyak, Nedyalko V Ivanov: Apparatus and method for fast FET switching in a digital output device. Rockwell Automation Technologies, Himanshu S Amin, Alexander M Gerasimow, William R Walbrun, April 29, 2003: US06555935 (11 worldwide citation)

An industrial control output device is provided which provides electrical isolation between device power and field power. The device includes two isolation devices, one of which is adapted to energize a power switching device, and the other is adapted to de-energize the switching device. The output ...


5
George D Maskovyak, John F Dodds: Simplified protocol for expanding a fixed width bus in an industrial controller. Allen Bradley Company, Keith M Baxter, John M Miller, John J Horn, October 8, 1996: US05564059 (7 worldwide citation)

The present invention provides an efficient method of transferring multi-word data across a fixed width parallel bus normally transmitting a single word at a time by allocating part of the bus word to the transmission of a fractional address dividing the given addressing space into subaddresses or " ...


6
George D Maskovyak, John F Dodds: System for data transfer where multi-word data transmission from industrial controller to I/O module is performed using I/O image table-based handshaking protocol. Allen Bradley Company, Keith Baxter, John J Horn, Alex M Gerasimow, March 28, 2000: US06044410 (5 worldwide citation)

A communication protocol employing dummy input and output values is used in communicating blocks of data between an industrial controller and its I/O modules while preventing premature use of partially transmitted data by the I/O modules yet without the need for special handshaking type circuitry or ...


7
George D Maskovyak, Nedyalko V Ivanov: Apparatus and method for isolating a field power source and a control power source in a controlled process. Rockwell Automation Technologies, R Scott Speroff, Amin & Turocy, July 6, 2004: US06759767 (3 worldwide citation)

An industrial control output device is provided which provides electrical isolation between device power and field power. The device includes two isolation devices, one of which is adapted to energize a power switching device, and the other is adapted to de-energize the switching device. The output ...


8
George D Maskovyak, Nedyalko V Ivanov: Apparatus and method for isolating a field power source and a control power source in a controlled process. Susam M Donahue, Rockwell Automation, August 14, 2003: US20030151312-A1

An industrial control output device is provided which provides electrical isolation between device power and field power. The device includes two isolation devices, one of which is adapted to energize a power switching device, and the other is adapted to de-energize the switching device. The output ...