Extended relay ladder logic for programmable logic controllers

Details Extended relay ladder logic for programmable logic controllers Extended relay ladder logic for programmable logic controllers

1997-08-21

1999-10-05

Gordon, Paul P.

Boots, shoes, and leggings

36414006, 36414007, 36414008, 364188, 364189, 364190, 364191, 364192, 395701, G05B 1101

Patent

active

059634464

ABSTRACT:
A digital computer implemented software system is provided for programming industrial logic controllers using a software package of the type utilizing relay ladder logic to represent control programs. The control program is executable by the controller to control the operation of one or more industrial devices. Using relay ladder logic, the control programmer is provided with a system to replace a coil with an ACTION block containing at least one complex expression. When the left side of the ACTION block is energized, the expression is evaluated. In a further embodiment, the programmer is able to replace a contact with a DECISION block containing a Boolean expression. When the left side of the DECISION block is energized, the Boolean expression is evaluated. If the expression evaluates as TRUE, the right side of the DECISION is energized.

REFERENCES:
patent: 5349518 (1994-09-01), Zifferer et al.
patent: 5553297 (1996-09-01), Yonezawa et al.
patent: 5717588 (1998-02-01), Yamane et al.

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