Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 43)

Hardware Description
Chapter 5
5Ć6
Each discrete input has an internal pull-up resistor. In chapter 6, we will
show you how to select an internal pull-up resistor of 1.2k or 11.2k. You
select each input individually through a switch setting.
For a high signal, the input device you connect to a discrete input does not
have to source current. For a low signal, the input device you connect to a
discrete input has to sink current through the pull-up resistor.
Hardware Start
In the auto mode, the module accepts a high-to-low transition at terminal
8 of the left wiring arm as a low-true hardware start input signal.
After completing a halt move, the 1771-ES expander will not execute the
next move until it receives a start command. The start command could
come through block transfer of a control block or through the hardware
start signal.
Feedrate Override Enable
In the auto mode, the module accepts a high-to-low transition at terminal
9 of the left wiring arm as a low-true feedrate override enable signal.
After setting a feedrate override value for the axis through the command
block and enabling external synchronization of feedrate override through
the parameter block, you can enable the feedrate override through this
input. Do this by setting bit 16 of word 17 in the parameter block ON
(Axis 1). (Set bit 16 of words 36 and 55 for axis 2 and 3, respectively.).
This allows you to activate a preloaded feedrate override value to change
speed on several axes at the same instant.
Jog Forward
In the manual mode, the module accepts the signal at terminal 8 of the left
wiring arm as a low-true jog forward signal. When the module receives
this signal, it moves the axis in the positive direction at the rate
established through block transfer.