Red Lion LEGEND - Manual (Page 20)

COUNT MODES (CONT’D)
QUAD X4 (QUADRATURE X4) (Cont’d)
In another instance, Input A will be the quadrature input and Input B will
be the count input. This enables each edge, positive and negative going, of
both inputs, 1 and 2, 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 unit processes the count pulses into a
string of time separated pulses, so the internal counter will not lose 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 unit processes the count pulses into a
string of time separated pulses so the internal counter will not lose any
count pulses. Input A serves as an add input (count increments) and Input B
serves as an additional add input (count increments).
RESET ACTION
The count display can be reset to Zero, Preset 2, or to the Counter Load
value. The method of reset for the display can be automatic, or by a user input.
The type of reset from a user input can be a Maintained or Momentary reset
(Refer to Program User Module for details). Automatic reset is covered in the
next section.
Note: Response time for a manual reset is 10 msec maximum.
RESET TO ZERO
When reset, the Counter Display value will return to Zero.
RESET TO PRESET 2
When reset, the Counter Display value will return to the Preset 2 value.
Output 2 triggers when the count reaches zero.
RESET TO COUNTER LOAD
When reset, the Counter Display value will return to the Counter Load
value.
AUTOMATIC RESET
The Automatic reset mode can be enabled or disabled. The Counter display
will automatically reset to the programmed reset action when one of the
automatic reset modes is selected. A manual reset by a user input will cause
the count to reset regardless of the automatic reset mode. The following
choices are available:
OUT1 (Reset at Beginning Of Output 1)
In this mode, the counter will reset when the count equals the preset 1
value. Output 1 can be timed or latched.
OUT1END (Reset at End Of Timed Output 1)
In this mode, the counter will reset after output 1 has timed out.
OUT2 (Reset at Beginning Of Output 2)
In this mode, the counter will reset when the count equals the preset 2
value. Output 2 can be timed or latched.
OUT2END (Reset at End Of Timed Output 2)
In this mode, the counter will reset after output 2 has timed out.
OUT1&2 (Reset at Beginning Of Output 1 or Output 2)
In this mode, the counter will reset when the count equals either preset 1
or preset 2 value. Outputs 1 and 2 can be Timed or Latched.
OUT1&2E (Reset at End Of Timed Output 1 or Output 2)
In this mode, the counter will reset after output 1 or output 2 has timed out.
NOTES
1. For Auto Reset modes, when operating between approximately 1/2 to
maximum count rate, all other presets should not occur within 1 to 6 counts
following the count value at which auto reset occurs. In Reset to Zero modes
with positive preset values, this would apply to count values between 0 and
6. For Reset to Preset or Counter Load modes, it would apply to preset values
between 0 to 6 counts less than the Preset 2 value (when postive).
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 Count
Load mode). If they are, only the auto reset output will activate. If the counter
is set to Auto Reset at OUT1 & 2, and Preset 1 is the same as Preset 2 (or zero
for Reset to Preset mode), Output 2 will activate and Output 1 will not. If the
unit is set to Auto Reset at OUT1, only Outputs 1 and 2 will activate.
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