89 Publication 1763-RM001C-EN-P - October 2009
Chapter
4
Using the High-Speed Counter and
Programmable Limit Switch
High-Speed Counter
Overview
All MicroLogix 1100, except the 1763-L16AWA, have one 20 kHz (40
kHz
(1)
) high-speed counter. The counter has four dedicated inputs that
are isolated from other inputs on the controller. HSC0 utilizes inputs 0
through 3.
This chapter describes how to use the HSC function and also contains
sections on the HSL and RAC instructions, as follows:
• High-Speed Counter (HSC) Function File on page 90.
• HSL - High-Speed Counter Load on page 118.
• RAC - Reset Accumulated Value on page 119.
Programmable Limit
Switch Overview
The Programmable Limit Switch function allows you to configure the
High-Speed Counter to operate as a PLS (programmable limit switch) or
rotary cam switch. See page 120 for more information.
(1) OS Series B FRN 4 or later
TIP
HSC0 is used in this document to define how any HSC
works.
IMPORTANT
The HSC function can only be used with the controller’s
embedded I/O. It cannot be used with expansion I/O
modules.
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