Method for emulating programmable logic controller by exchanging information between debug program which emulates I/O devices and ladder logic program
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United States of America Patent
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Jan 4, 1994
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N/A
app pub date -
Mar 31, 1993
filing date -
Jun 30, 1989
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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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