Patent ID: 6021357
Filing Date: 2000-02-01
Classification: G05B

Abstract:
A logic controller apparatus for solving ladder logic, said ladder logic including a ladder rung having including a power rail, a neutral rail, and a plurality of devices organized in a plurality of rows, with the rows being in said ladder rung and including at least one of the devices and with the devices having two ports, with power from said power rail to said neutral rail flowing from the left port to the right port of at least one of the devices, and with power flowing from the second port to the first port of at least another one of the devices in at least one of said rows, said apparatus comprising:means for storing representations of said ladder logic;means for storing a plurality of digital logic signals; andmeans employing at least some of the digital logic signals for solving said representations of said ladder logic independent of power flow direction in said at least one of said rows.