The 2502 module provides two high-speed 16-bit counter channels in a compact, single-wide module to fit in the 2500 Series® I/O base.

The 2553-A is designed for precise measurement of mag meter or turbine meter pulses both at low speeds and high speeds (Reflex Counter Mode). The 2553-A can also be used to compensate for measurement errors due to wheel wobble (N-tooth counting mode).

The 2554-A is an isolated 4-channel high-speed counter input module. Each channel can operate in one of three selectable modes: frequency, period, or general counter. In addition, two channels may be configured together for quadrature mode operation.