Rockwell Automation 1771-QB Linear Pos. - Manual (Page 36)

Hardware Description
Chapter 4
4Ć7
Hardware Stop Input
The module accepts the signal at the STOP terminal (17/18) as a low-true
hardware stop input. A low signal at the hardware stop input disables the analog
output and stops axis movement. Unless the discrete inputs are disabled via the
parameter block, this input must be high for normal operation. If the connection
breaks, axis movement stops.
Example: If the loop fault output of one axis is connected to the hardware stop
input of another axis, the movement of both axes will stop if a fault occurs.
Jog Forward Input
In manual mode, the module accepts a high signal at the JOG FWD terminal
(19/20) as a high-true jog forward signal. When the module receives this signal,
it moves the tool or workpiece forward until it reaches the software limit or
until the input goes low. Forward is the direction of positive movement relative
to the zero-position offset. Chapter 7 explains how to define the zero-position
offset in the parameter block.
Jog Reverse Input
In manual mode, the module accepts a high signal at the JOG REV terminal
(21/22) as a high-true jog reverse signal. When the module receives this signal,
it moves the tool or workpiece in the reverse direction until it reaches the
software limit or until the input goes low. Reverse is the direction of negative
movement relative to the zero-position offset.
Important: If the module detects a feedback fault, the jog inputs will perform
open-loop jogs only. This means that the module can send velocity commands
to the servo valve (at the low jog rate), but can’t monitor axis position.
Therefore, software travel limits are ignored.
General Purpose Inputs
There are two general purpose inputs for each control loop of the module at
terminals INPUT 1 (23/24) and INPUT 2 (25/26). You can monitor the state of
the signal at these terminals through the status block. These inputs can also be
configured as programmable as described in Chapter 9.
The module’s analog outputs, terminals 29 through 32, connect to a hydraulic
valve for each axis that the module controls. These outputs supply up to +100
mA for direct servo valve control or up to +10 V for proportional valve
amplifiers or other voltage controlled devices.
Analog Output Interface