2711PRW7 A-B Communication Processor

2711PRW7 A-B  Communication Processor

This chapter explains how to program the MicroLogix 1000 programmable controller. Read this chapter for basic information about: • principles of machine control • understanding file organization and addressing • understanding how processor files are stored and accessed • applying ladder logic to your schematics • a model for developing your program Program files contain controller information, the main ladder program, interrupt subroutines, and any subroutine programs. These files are: • System Program (file 0) - This file contains various system related information and user–programmed information such as processor type, I/O configuration, processor file name, and password. • Reserved (file 1) - This file is reserved. • Main Ladder Program (file 2) - This file contains user–programmed instructions defining how the controller is to operate. • User Error Fault Routine (file 3) - This file is executed when a recoverable fault occurs. • High–Speed Counter Interrupt (file 4) - This file is executed when an HSC interrupt occurs. It can also be used for a subroutine ladder program. • Selectable Timed Interrupt (file 5) - This file is executed when an STI occurs. It can also be used for a subroutine ladder program. • Subroutine Ladder Program (files 6 - 15) - These are used according to subroutine instructions residing in the main ladder program file or other subroutine files.

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