Rockwell Automation 1794-VHSC 1794 FLEX I/O Very High Speed Counter Module User Manual User Manual
Page 15
Rockwell Automation Publication 1794-UM010D-EN-E - July 2013
7
Overview of the Very High Speed Counter Module
the counter to be read and stored. The counter will continue counting. The
stored count will be available in the Read Data file. The stored count information
will remain in the block transfer read file until it is overwritten by new data.
Store/Continue
In mode 2, store/wait/resume (see Figure
), a rising
edge of a pulse input on the Z input (gate/reset) terminal reads and stores the
current counter value in the Read Data file, and inhibits counting while the gate/
reset input is high. Counting resumes when the input goes low.
Mode 2 does not reset the counter, although it does store the count value. The
stored count is available in the Read Data file. The stored count remains in the
Read Data file until it is overwritten with new data.
Store/Wait/Resume
In mode 3, store-reset/wait/start (see Figure
Store-Reset/Wait/Start on page 7
),
the rising edge of the pulse on input Z (gate/reset) terminal causes the counter to
stop counting, store the current count value in the Read Data file and reset the
count to zero. The counter does not count while the Z input on the gate/reset
terminal remains high. Counting resumes from zero on the falling edge of the
pulse at the Z (gate/reset) terminal. The stored count is available in the Read
Data file. The stored count remains in the Read Data file until it is overwritten
with new data.
Store-Reset/Wait/Start
In mode 4, store-reset/start (see Figure
), on the rising
edge of a pulse input at the Z (gate/reset) terminal causes the counter to store the
accumulated count value in the Read Data file, and reset the counter to zero. The
counter continues counting while the Z gate/reset input is high. The stored count
Read, Store Count and
continue counting.
Store Count
Stop counting
Resume counting
Stop count, store
and reset to zero
Counter has stopped counting
Start counting
from zero