Red Lion LEGEND - Manual (Page 22)

COUNT MODES (CNT.INPUT) (Cont’d)
QUAD X2 (QUADRATURE X2)
When two edge counting is used, the quadrature mode works the same as with
single edge counting when Input B is low. But when Input B is a high level,
counts at Input A are no longer ignored. Instead, the logic rules for Input A are
complemented, allowing both edges of Input A to be counted. This doubles the
effective resolution of the encoded input.
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).
PROCESS RESET ACTION (PRC. RST.)
The Process 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 Process Counter Display value returns to Zero.
TO P2 (PRESET 2)
The Process Counter Display value returns to the Preset 2 value. Output 2
triggers when the count reaches zero.
TO CT LD (COUNTER LOAD)
The Process Counter Display value returns to the Counter Load value.
Note: The Counter Load reset action should be programmed for only one count
display, either the process count or the batch count.
PROCESS AUTOMATIC RESET (P AUTO.RS)
The Automatic reset mode can be enabled or disabled. The Process 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 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
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