Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 465)

MicroLogix 1000 and PLC-500 A.I. Series Software Reference
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Using Masks
You may want to “mask” out certain bits of a word, forcing the histogram to ignore
these bits.
To create a mask:
1. Begin a Histogram. (Mask values can only be entered when a histogram is
running.)
2. From the Histogram screen, press [F4] Mask . At the top of the screen, the system
displays a prompt asking you to enter a mask value.
3. Type a number in hexadecimal notation for the mask value, and press [Enter] . A
zero bit in the mask will prevent data at that bit from being monitored. A one bit
in the mask will allow data at that bit to be monitored. For example, entering a
mask of FFFF will cause all bits in the word to be examined. A mask of FFF0
would cause the low four bits to be ignored. See Appendix D - Number Systems in
the Instruction Set Reference for more information on numbering systems and Hex
masks.
Printing Histogram Data
To log histogram data to a printer or file:
1. From the histogram screen, press [F9] Prntdev . The system prompts you for a
print device.
2. Type the name of your print device (e.g. LPT1, COM1, etc.) or the name of a disk
file.
3. To start logging histogram data, press [F3] Log . Press [F1] Begin , if the
histogram is not already running. To stop logging data, press [F3] Log again.