Allen-Bradley micrologix 1500 Reference Manual

1 Publication 1762-RM001C-EN-P
Chapter 5
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.
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.
NOTE
HSC0 is used in this document to define how any HSC
works. The MicroLogix 1500’s HSC1 is identical in
functionality.
IMPORTANT
The HSC function can only be used with the controller’s
embedded I/O. It cannot be used with expansion I/O
modules.

Allen-Bradley micrologix 1500 Specifications

General

Processor Type	16-bit
Programming Language	Ladder Logic
Mounting	DIN rail or panel mount
Programming Software	RSLogix 500
Communication Ports	RS-232
Power Supply	24V DC
Operating Temperature	0°C to 55°C (32°F to 131°F)
Controller Type	Programmable Logic Controller (PLC)