Method for checking the syntax of an instruction list program to

Details Method for checking the syntax of an instruction list program to Method for checking the syntax of an instruction list program to

1989-10-16

1991-10-15

Heckler, Thomas M.

Boots, shoes, and leggings

36492693, 364949, 3649457, G06F 1100

Patent

active

050580523

ABSTRACT:
A method is provided by which a programmable logic controller checks each statement of an instruction list (IL) program to determine if any such statement or the order of statements violates one of a set of syntax rules which are stored in a memory in the controller. If a rule violation is found, an error indication is generated to signify that the particular IL program under test by the controller can not be accurately converted or translated into a relay ladder diagram. However, if no rule violation is found by the controller, then the controller accepts the IL program.

REFERENCES:
patent: 3975622 (1976-08-01), Horn et al.
patent: 4162536 (1979-07-01), Morley
patent: 4213174 (1980-07-01), Morley et al.
patent: 4648064 (1987-03-01), Morley
patent: 4841434 (1989-06-01), Mathewes, Jr. et al.
patent: 4853851 (1989-08-01), Horsch

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