Patriot Sensors & Controls, Inc.

Michael S McGrath

Jack C Pattee

Lonny C McKinnon

Kenneth G Maxwell

Jeffrey A Millinton

Gerald C Wieczerza

A method and system for generating a control program executable by an industrial controller, wherein a source program is displayed using a variable width ladder diagram. Instructions of a source program are received by a host computer, wherein the source program is compilable into the control program. A ladder diagram representative of at least one of the instructions of the source program is displayed on a display device. The ladder diagram comprises a graphical interconnection of schematic elements, at least one of which having a corresponding display width which is variable. The corresponding display width is varied in dependence upon the greater of a corresponding symbol display width and a corresponding label display width. A method and system for data communication with the industrial controller uses a hybrid error detection code. Each transmitted packet of data is augmented with either a Fletcher checksum code if the length of the packet is less than a predetermined packet length threshold, or a CCITT-16 cyclic redundancy check code if the length of the packet is greater than or equal to the predetermined packet length threshold.

Method and systems for use with an industrial controller

A method and system for generating a control program executable by an industrial controller, wherein the control program is formed using instructions from a high-level text-based language and instructions from a ladder-based language. A source program is received by a host computer. At least one instruction of the source program in the high-level text-based language is displayed on a display device along with a corresponding ladder diagram of the source program in the ladder-based language. The source program is edited in either the high-level text-based language using a first editor or the ladder-based language using a second editor. Modifications of the source program made using the first editor and the second editor are converted to a lower-level language representation. The lower-level language representation is convertible to both the high-level text-based language and the ladder-based language, so that modifications made in the high-level text-based language dynamically update the ladder diagram display and modifications made in the ladder-based language dynamically update at least one line of displayed text.

Growing community of inventors

Royal Oak, MI, United States of America

Michael S McGrath