Industrial controller with optimized execution of relay ladder l

Details Industrial controller with optimized execution of relay ladder l Industrial controller with optimized execution of relay ladder l

1995-08-16

1997-04-22

Gordon, Paul P.

Boots, shoes, and leggings

364191, G05B 1101, G06F 945

Patent

active

056234015

ABSTRACT:
A method of operating an industrial control system converts relay ladder logic programs into flow type programs expressed as `logical gates` connected with `wires` representing variables. This formulation is converted to an efficient code structure in which changes in state of the variables are evaluated and only changes are propagated in evaluating program outputs. The net effect is many steps of evaluation in the control program are avoided during real-time operation of the program connected to controlled equipment.

REFERENCES:
patent: 4722071 (1988-01-01), Gates et al.
patent: 5233697 (1993-08-01), Yamauchi
patent: 5265004 (1993-11-01), Schultz et al.
patent: 5504902 (1996-04-01), McGrath et al.
patent: 5586335 (1996-12-01), Utan

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