Rockwell-automation 1746-HSCE High-Speed Counter Module Installation I Manual de usuario descargar pdf (Pagina 16)

16 High-Speed Counter Module

Publication 1746-IN011C-EN-P - April 2005

Single-Ended Encoder Wiring (Open Collector)

Single-Ended Encoder Output Waveforms

The figure below shows the single-ended encoder output waveforms. When the

waveform is low, the encoder output transistor is ON.

VS Value R Value Maximum Output Leakage

+5V dc 150 ohm 1/4W 5% 6.3 mA

+12V dc 1800 ohm 1/4W 5% 1.5 mA

+24V dc 4700 ohm 1/4W 5% 1.2 mA

A(+)

A(-)

B(+)

B(-)

Z(+)

Z(-)

1 2 3

+VDC

COM

GND

Belden 9503 or equivalent

305m (1000tft) max length

Power

Supply

Allen-Bradley

845H Series

single-ended

encoder

encoder connector housing

Earth

Shield

(2)

Module Inputs

SW1

OFF

(All switches OFF)

cable

(1)

(1) Refer to your encoder manual for proper cable type and length.

(2) Due to the topology of the module’s input circuits, terminating the shield at the encoder end provides the highest immunity

to EMI interference. Connect EARTH ground directly to the encoder connector housing.

(3) The pullup resistor (R) value depends on the power supply value (VS). The table below lists the resistor values for typical

power supply values. These resistors must be located at the encoder end of the cable.

(3)

low = transistor ON

high = transistor OFF

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Rockwell-automation 1746-HSCE High-Speed Counter Module Installation I Manual de usuario Pagina 16

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