GE VersaMax IC200PWR001 User Manual page 453

13
IC200MDD841
Mixed Module, 24 V DC 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-1504N Chapter 13 Mixed Discrete/High-Speed Counter Module 13-13