Red Lion LEGEND - Manual (Page 58)

NOTES:
1.
SENSOR VOLTAGE AND CURRENT
The +12 VDC (in/out) terminal can supply voltage to a sensor within a ±25%
variation, due to line and internal load variations. All RLC sensors will
accommodate this variation.
2. HI/LO FRQ SELECTION
The HI/LO FRQ selection switch must be set on “LO FRQ” when switch
contacts are used to generate count input signals. The “LO FRQ” mode also
provides very high immunity against electrical noise pickup. It is
recommended that this mode also be used, when possible, with electronic
sensor outputs. The “LO FRQ” mode can be used with any type of sensor
output, provided count pulse widths never decrease below 10 msec, and the
count rate frequency does not exceed 50 cps.
3. When shielded cable is used, the shield should be connected to “COMM.” at
the unit and left disconnected at the sensor end.
4. Inputs A and B can accept source pulses from other circuits up to +28 V in
amplitude. For voltages above +28 V, a limiting resistor and zener diode
should be used to limit the voltage at the input.
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