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Up Next in Introduction to Allen Bradley PLCs - RSLogix 500

  • 10. Forcing File Concepts

    There are two special files, called forcing files, one for inputs and one for outputs.
    These files are used for troubleshooting or when I/O is not available, such as when a sensor fails.
    The forcing files allow the value supplied by the I/O subsystem to be over-written by the programmer in orde...

  • 11. RSLogix File Structure

    In the last lesson, we briefly described the data files. Now, we will describe these files in more depth and show how they are used.

    Note that each data file is described by a letter followed by a number.

    The letter indicates the type of data represented by that file, and the number represents ...

  • 12. Output Files

    Output file 0 and Input file 1 are defined to hold values from physical I/O cards.

    All of the data files are presented in much the same way. The Output file holds values that are associated with physical output cards. For a MicroLogix 1100, up to 64 outputs, or four 16-bit output words, can be ...