ELEC 255 Lecture 1: Timers and Counters- 255
Document Summary
Timers provide simple time based control, with multiple modes and adjustable timing ranges, discrete outputs, and a mechanical or electronic display. Timers can work in on delay and off delay modes. On delay relay with no contacts will wait 5 s (after being energized) before closing its contacts. When the relay is de energized, the contacts will open immediately. Off delay relay: the off delay relay provides a time delay when the coil is de energized. For example, an off delay relay with no contacts would close its contacts immediately when energized; when it is deenergized, however, the contacts would remain closed for 5 more seconds before opening. Counters can count numbers of parts, procedures, cycles.
