Allen-Bradley POINT I/O 1734-VHSC24, User Manual, Page: 18 / 64

Publication 1734-UM003A-EN-P - August 2000
1-10 About the Very High Speed Counter Modules
Operating Mode Features
The following table summarizes which features are active in each
mode:
Operating Mode Features
The Z Gate/Reset Terminal will operate in one of four modes when
the Store Count feature is in use. The four figures below detail the
operation in each mode.
Store Count Mode 1: Store/Continue
In mode 1, the rising edge of a pulse input on the Z Gate/Reset
terminal will cause the current counter value to be read and stored in
the Read Data file. The counter will continue counting. The stored
count will be available in the Stored/Accumulated Count word. The
stored count information will remain until it is overwritten with new
data.
Store/Continue
Operating Feature Counter
Up / Down Encoder
X1, X2 & X4 Period
/Rate Continuous
/Rate Rate
Measurement PWM
Preset Y Y N N N N
Rollover Y Y N N N N
Software Reset Y Y Y Y Y Y
Store Count -
Z Gate / Reset
4 modes Y Y N N N N
Scale Input Count at
Z Gate / Reset N N Y Y N N
Z Gate / Reset Invert Bit Y Y Y Y N N
Enable /Force Outputs Y Y Y Y Y Y
Assign Outputs Y Y Y Y Y Y
Operate Outputs
(Based On) Y
(Count) Y
(Count) Y
(Count) Y
(Count) Y
(Count) Y
(PWM Value)
Sample Period N N N N Y Y
Read, Store Count,
and Continue Counting