Method for emulating programmable logic controller by exchanging

Details Method for emulating programmable logic controller by exchanging Method for emulating programmable logic controller by exchanging

1993-03-31

1994-01-04

Lee, Thomas C.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

364243, 3649269, 364949, 364DIG2, 364191, 345700, 345500, G06F 9455, G06F 9305

Patent

active

052768112

ABSTRACT:
The present invention discloses a software package for developing ladder logic programs for Programmable Logic Controllers (PLCs). The present invention provides a method of troubleshooting ladder logic programs for a programmable logic controller. The ladder logic program is debugged using an emulator executing on a computer. The emulator executes a second ladder logic program. The second ladder logic program generates the inputs that drive the ladder logic program being debugged. The second ladder logic program is comprised of output instructions that drive input instructions in ladder logic program being debugged. Thus, the emulator simulates the operation of the programmable logic controller.

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