Allen-Bradley MicroLogix 1200 Reference Manual page 71

1
Using the High-Speed Counter
The MicroLogix 1200 has one 20 kHz high-speed counter; the MicroLogix
1500 has two. Functionally, the counters are identical. Each counter has
four dedicated inputs that are isolated from other inputs on the controller.
HSC0 utilizes inputs 0 through 3 and HSC1 (MicroLogix 1500 only) utilizes
inputs 4 through 7. Each counter operates independently from the other.
HSC0 is used in this document to define how any HSC
NOTE
works. The MicroLogix 1500's HSC1 is identical in
functionality.
The HSC function can only be used with the controller's
IMPORTANT
embedded I/O. It cannot be used with expansion I/O
modules.
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 5-2.
• HSL - High-Speed Counter Load on page 5-26.
• RAC - Reset Accumulated Value on page 5-27.
5
Chapter
Publication 1762-RM001C-EN-P