Red Lion LEGEND - Manual (Page 7)

When power is turned off, the unit automatically saves the settings and data
in its no power memory. When power is restored, the LGM restores the
parameters it had at power down. The EPROM’s life expectancy is at least
100,000 power cycles.
The LGM offers a choice of seven programmable counting modes for use
in applications requiring Bi directional, Anti coincidence, and Quadrature
counting. A separate Inhibit terminal can be used for any of the count modes.
Input A accepts a signal for the Count and Rate display. Input B accepts a
signal for the Count display or direction control. In the Anti coincidence
mode, both inputs are monitored simultaneously, so that no counts are lost,
and the final count can be chosen as the sum or difference of the two inputs.
Rate and Count displays have separate scaling and decimal point
placement, for the readouts in different units.
The Counter Load feature enables the operator to modify the count value
under circumstances that occur when flawed material has been counted and it
is necessary to adjust the count value accordingly.
The rate operates in the time interval method (1/tau) to calculate the rate
value. This method insures high resolution at all input rates. Averaging can be
accomplished by programming the Minimum and Maximum Update Time for
the desired response. Extensive scaling capabilities allow practically any
reading at very slow input rates.
Solid state outputs one through four are assigned to the count display and
outputs five and six can be assigned to either the Counter or Rate indicator.
The programmable outputs can be set for a variety of functions.
The construction of the Legend LGM unit is a lightweight, high impact
plastic case with a clear viewing window. The sealed front panel with the
silicone rubber keypad meets NEMA 4X/IP65 specifications for wash down
and/or dusty environments, when properly installed. Plug in style terminal
blocks simplify installation and wiring change outs.
SAFETY SUMMARY
All safety related regulations, local codes and instructions that appear in
the manual or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
Do not use this unit to directly command motors, valves, or other actuators
not equipped with safeguards. To do so, can be potentially harmful to persons
or equipment in the event of a fault to the unit.
BASIC OPERATION
The Legend has a counter that keeps track of the input pulse Count. The
unit takes the actual number of pulses counted (internal count value) and
multiplies them by the Count Scale Factor and Count Scale Multiplier. This
results in the desired reading value for the count display. The unit can count
on both edges of the pulse if desired. Input A accepts the signal for the count
and Input B is used for quadrature or for anti coincidence counting, or to
control up or down counting. There is a separate Inhibit terminal that can be
used with any of the count modes.
The Counter has three Reset Action modes associated with the display;
Reset to Zero (up count modes), Reset to Preset (down count modes), or
Reset to the Counter Load value. A Reset can be a manual reset, using a
programmable user input, or it can be one of the seven programmable
automatic reset modes. Both the reset action and automatic reset modes are
programmed in the Program Counter Module.
The Counter will display the scaled number of pulses that have been
entered. When the count equals a Preset, the appropriate output will activate.
The count can be programmed to automatically reset if desired. The internal
precision of the Counter is maintained to 9 digits.
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