Red Lion LEGEND - Manual (Page 22)

COUNT MODES (CNT.INPUT) (Cont’d)
QUAD X4 (QUADRATURE X4)
This mode takes the quadrature mode, with two edge counting, one step
further. In quadrature times 4, both Input A and Input B serve as the count or
quadrature input, depending on their state. In one instance, Input A serves as
the count input and Input B serves as the quadrature input. In another instance,
Input A is the quadrature input and Input B is the count input. This enables each
edge, positive and negative going, of both inputs, A and B, to be counted. This
results in a resolution four times greater than in the basic quadrature X1 mode.
As in the other modes, Input A is also used for the rate input.
ADD/SUB (TWO INPUT ANTI/COINCIDENCE ADD/SUBTRACT)
This mode effectively separates count pulses that may simultaneously
appear at the two inputs. The Legend Plus processes the count pulses into a
string of time-separated pulses, so the internal counter does not miss any
count pulses. Input A serves as the add input (count increments) and Input B
serves as the subtract input (count decrements).
ADD/ADD (TWO INPUT ANTI/COINCIDENCE ADD/ADD)
This mode effectively sums count pulses that may simultaneously appear
at the two inputs. The Legend Plus processes the count pulses into a string of
time-separated pulses so the internal counter does not miss any count pulses.
Input A serves as an add input (count increments) and Input B serves as an
additional add input (count increments).
COUNTER RESET ACTION
The count display can be reset to Zero, Preset 2, or to the Counter Load
value. The display can be reset automatically or by a User Input. A User Input
can be programmed for a Maintained or Momentary reset (See Program User
Module for details). Automatic reset is covered in the next section.
RESET TO ZERO
The Counter Display value returns to Zero.
TO P2 (PRESET 2)
The Counter Display value returns to the Preset 2 value. Output 2 triggers
when the count reaches zero. This is not recommended for Boundary mode.
TO CT LD (COUNTER LOAD)
The Counter Display value returns to the Counter Load value.
COUNTER AUTOMATIC RESET (AUTO RST)
The Automatic reset mode can be enabled or disabled. The Counter display
automatically resets to the programmed reset action, when one of the automatic
reset modes is selected. A manual reset by a User Input causes the count to reset
regardless of the automatic reset mode. The following choices are available:
OUT1 (Reset at Beginning Of Output 1)
The counter resets when the count equals the preset 1 value. Output 1 can
be timed or latched.
OUT1END (Reset at End Of Timed Output 1)
The counter resets after output 1 has timed out.
OUT2 (Reset at Beginning Of Output 2)
The counter resets when the count equals the preset 2 value or zero (Reset
to P2). Output 2 can be timed or latched.
OUT2END (Reset at End Of Timed Output 2)
The counter resets after output 2 has timed out.
OUT1&2 (Reset at Beginning Of Output 1 or Output 2)
The counter resets when the count equals preset 1, preset 2,or zero (reset to
P2). Outputs 1 and 2 can be Timed or Latched.
OUT1&2E (Reset at End Of Timed Output 1 or Output 2)
The counter resets after output 1 or output 2 has timed out.
Notes:
1. For Auto Reset modes, when operating approximately ½ or greater than ½ of
the maximum count rate, all other presets should not be within 1 to 3 counts
(positive or negative) of the value to which Auto Reset resets. In Reset to Zero
modes this would apply to any presets within 0 to 3 counts (positive or negative)
of zero. For Reset to Preset 2 or Counter Load modes, it would apply to presets
within 0 to 3 counts (positive or negative) of Preset 2 or Count Load values.
2. For Auto Reset modes, no other count presets should be set to the same count
value at which Auto Reset occurs (Preset 2 or zero for Reset to Preset or
Counter Load mode). If they are, only the auto reset output will activate. If the
counter is set to Auto Reset at Out1&2, and other Presets are the same as
Preset 2(or zero for Reset to Preset mode), only Output 2 will activate.
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