1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

Using the High-Speed Counter and Programmable Limit Switch 101The HSC is extremely versatile; the user can select or configure the masterHSC for any one of ten (10) modes and the sub HSC for any one of five(5) modes of operation.Operating Modes are discussed later in this chapter. See the section HSCMode (MOD) on page 116. Some of the enhanced capabilities of theHigh-Speed Counters are:• 100 kHz operation• High-speed direct control of outputs• 32-bit signed integer data (count range of ± 2,147,483,647)• Programmable High and Low presets, and Overflow and Underflowsetpoints• Automatic Interrupt processing based on accumulated count• Run-time editable parameters (from the user control program)The High-Speed Counter function operates as described in the followingdiagram.Overflow+2,147,483,647 maximumHigh Preset0Low PresetUnderflow-2,147,483,648 minimumPublication 1766-RM001A-EN-P - October 2008