Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 44)

Hardware Description
Chapter 5
5Ć7
Jog Reverse
In the manual mode, the module accepts the signal at terminal 9 of the left
wiring arm as a low-true jog reverse signal. When the module receives
this signal, it moves the axis in the negative direction at the rate
established through block transfer.
Home
The module accepts the signal at terminal 10 of the left wiring arm as a
low-true home signal. The module considers the first marker pulse after
the home signal as the home position.
Hardware Stop
The module accepts the signal at terminal 11 of the left wiring arm as a
high-true hardware stop signal. Unless this input is pulled low, the
module holds the velocity command output signal at zero and disables the
servo drive by turning off the drive disable circuit.
Encoder Inputs
Terminals 2, 3, 4, 5, 6, and 7 on the left wiring arm provide connection
points for input signals from the encoder. Through jumpers on the
module, you can select each channel individually for either single-ended
or differential, and for either high-true of low-true input signals.
If you use a single-ended encoder, limit the input pulse rate to 20k Hz. If
you use a differential encoder, limit the input pulse rate to 250k Hz.
The 1771-ES expander is compatible with Allen-Bradley Incremental
Differential Line Driver Encoders (cat. no. 845N-SJDN4-C) and with
other encoders having current-sinking (5-30V dc) line-driver outputs,
totem-pole (TTL) outputs, or open-collector outputs.
You must provide at least two external dc power supplies to provide
power for the input and output circuits.
External Power Supplies