Ronald C Mitchell

Address:

575 Croft Ml Rd, Aiken, SC 29801

Phone:

(803)6482660

VIN:

3GNEC12077G311213

Make:

CHEVROLET

Model:

AVALANCHE

Year:

2007

US Patent:

57271704, Mar 10, 1998

Filed:

Dec 29, 1994

Appl. No.:

8/365646

Inventors:

Ronald Mitchell - Johnson City TN
Temple L. Fulton - Elizabeth TN

Assignee:

Siemens Energy & Automation, Inc. - Alpharetta GA

International Classification:

H01J 1300

US Classification:

395285

Abstract:

The PLC has a user configurable protocol port attached thereto. Briefly stated, at the PLC communication port or as a result of a user program or I/O event, a special flag bit may be set which thereby allows the communication port to be activated. This is done by the flag bit causing an interrupt to occur in the PLC user program which allows a user to communicate with a user specified protocol scheme rather than the normal communication/programming protocol when this special bit is not set.

US Patent:

57650004, Jun 9, 1998

Filed:

Dec 29, 1994

Appl. No.:

8/365658

Inventors:

Ronald Mitchell - Johnson City TN
Mark Boggs - Johnson City TN
Robert J. Palermo - Johnson City TN
Temple Fulton - Elizabeth TN

Assignee:

Siemens Energy & Automation, Inc. - Alpharetta GA

International Classification:

G06F 1326
G06F 946

US Classification:

395739

Abstract:

The scan cycle in a programmable logic controller is constructed so as to allow the PLC users program to execute an instruction to assign a user program section to which the PLC system is to transfer control upon the occurance of an instruction-specified event. Also allowed is the de-assignment of a user program section from an instruction-specified event. Moreover, the interrupt may happen at any portion of the PLC scan cycle and not merely at compilation time. This thereby allows for dynamically presetting values of characters and the like as well as pipelining of interrupts in the PLC.