Data processing: generic control systems or specific application – Generic control system – apparatus or process – Sequential or selective
Reexamination Certificate
2007-09-18
2007-09-18
Pham, Thomas K. (Department: 2121)
Data processing: generic control systems or specific application
Generic control system, apparatus or process
Sequential or selective
C710S013000, C710S023000, C711S115000
Reexamination Certificate
active
11000148
ABSTRACT:
The work memory of a programmable logic controller (PLC) is loaded with only one instruction at a time from the PLC's load memory which contains the entire instruction set to control a process. Each instruction has a format which contains at least one option code which must be evaluated to be true by the PLC interpreter before the corresponding instruction can be executed. If the interpreter evaluates the at least one option code to be false, the instruction is not executed and the next instruction is transferred from the load memory to the work memory and its corresponding option codes are then evaluated.
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Bauer Jeffery Van
Dax William John
Air Products and Chemicals Inc.
Morris-Oskanian Rosaleen P.
Pham Thomas K.
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