MAN0964-13-EN_XL4_UM
A u g u s t 6 , 2 0 2 1 P a g e 95 | 194
9.3.7 HSC Functions
The high-speed input on the XL4 contains many optional tasks. All of which can be disabled, or
set to an internal pre-assigned register (Assigned %Q) or to one of the external high speed
inputs (External Input #1, 2, 3, or 4), or they can be set as an “overflow interrupt” or
“underflow interrupt” meaning that they will occur when either the Overflow or Underflow
input has been activated.
Disable: When the Disable function is active, it will “disable” the high-speed inputs and no
longer count pulses until it is re-enabled
Latch: When the Latch function is active, it takes the current value of the Accumulator and
moves it into the “Latch Value” register.
Preload: When the pre-load function is active, it will take the value from the “Preload” register
and put it into the “Accumulator” for the corresponding Counter.
Clear: When the clear function is active, it will move a value of zero (0) into the “Accumulator”
for the corresponding counter.
Marker: When the marker function is enabled, it acts as a dynamic enable/disable for the
Disable, Latch, Preload, and Clear functions. Therefore, if the marker is enabled and “Assigned
%Q” is selected, then both the “Disable” and the “Disable Marker” bits need to be set high in
order to disable the high-speed input. If the Marker is set for one of the inputs, then the input
will need to be “High” to use any of the Disable, Clear, Preload, or Latch functions.
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