AE series counters are available in 2, 3, 4, 5, and 6 digit versions with digit sizes ranging from 1-inch high to 12 inches high. Standard signal types for COUNT and RESET include dry contacts from limit switches, proximity detectors, or relays; DC voltage signals from PLC's, TTL outputs (NPN or PNP) from instruments and detectors; and AC voltage signals from PLC's or other control equipment. The opto-isolated inputs allow the controls to be up to 1000 feet away from the display.