Type B2 Counter; Homing Sequence - GE VersaMax Manual

13
IC200MDD841
Mixed Module, 24VDC Positive Logic Input 20 Points / Output 12 Point /
(4) High Speed Counter, PWM, or Pulse Train Configurable Points

Type B2 Counter

The Type B2 counter uses two counter input signals for A-Quad-B counting and two other
counter input signals to perform a homing sequence. The operation of this counter is
identical to the Type B counter, except for the homing sequence.
The phase relationship between the counter inputs (A & B) determines whether the
accumulator is incremented or decremented on a transition of either counter input. The
count direction is up if A leads B. The count direction is down if A lags B.
The Type B counter has a Strobe register, a Preload register, a 16-bit Accumulator, and a
Counts-per-Timebase register. These operate as described for Type A counters.
The Type B counter can have one output that is activated based on selected On and Off
preset values.

Homing Sequence

The Type B2 counter uses two high-speed inputs to perform homing: Enable Home and
Marker. These inputs are normally assigned to Channel 3 Preload/Strobe and Channel 4
Preload/Strobe. Therefore, when the module is configured as a Type B2 counter, no other
counters are available.
GFK-1504K Chapter 13 Mixed Discrete/High-speed Counter Module 13-13