Horner APG XLt OCS - Manual (Page 40)

CH. 10 MAN0878-04-EN
August 12, 2009 Page 40 of 100 ECN # 979
Three different options are available to reset the current count. They are:
• Configured reset value
When configuring the Totalize function, a value may be specified under the Counts per Rev
column. When the totalizer accumulator reaches this value - 1, the accumulator will reset to zero
on the next count. Specifying zero for this value allows the totalizer to count through the full 32-
bit range before resetting.
• Ladder control
Setting registers %Q17-20 reset HSC1-4 (respectively) with no additional configuration. When
these registers are asserted, the associated totalizer accumulator is reset and held at zero (level
sensitive). See also Section 10.6.
• Direct digital input control (HSC1 and HSC2 only)
HSC3 (%I11) and HSC4 (%I12) may be configured as hardware digital reset signals for HSC1
and HSC2 (respectively). To enable these inputs as reset signals, specify the type as Totalize
Reset (note that the corresponding Totalize HSC must be previously configured before this option
is available). The direct digital reset controls are edge sensitive with the edge polarity
configurable.
Maximum direct digital reset latency is 100 µs.
The totalize function also supports an option which compares the current accumulator value with a
supplied Preset Value (PV), which is provided through a %AQ, and drives a physical digital output based
on the that comparison.
• This option (available for HSC1 and HSC2 only) drives Q1 or Q2 output point (respectively) once
the associated totalizer accumulator reaches (or exceeds) the PV value. To enable this function,
the corresponding PWM function output (Q1 or Q2) must be configured for HSCx Output.
Note that Q1 and Q2 are PWM function outputs that may be configured independently as
one of the following: standard digital output, PWM, HSCx or stepper output.
Preset values may be modified during run-time. A preset value of zero disables (resets) the
totalizer compare function output causing the output to remain low.
10.2.3 Pulse
In pulse mode, the high-speed input can measure the width or period of a pulse stream in one of four
modes and provides a continuous indication of the last sampled value.
Width High 1 µs Counts – In this sub-mode the accumulator value will contain the number of 1 µs
counts the pulse is high.
Width High