Rockwell Automation 1771-QA Stepper Positioning Assembly User Manual - Manual (Page 19)

2–9 Assembly and Installation
Publication 1771-UM002A–EN–P – May 2000
•
EXPANDER COMMUNICATIONS FAULT (Red)
This indicator is normally off. If a communications fault between
the stepper controller module and any one of the pulse output
expander modules is detected, or a hardware fault in any one of
the pulse output expander modules is detected, this indicator will
illuminate.
Important: If both red indicators illuminate simultaneously at
power-up, the stepper controller module has a hardware
fault.
•
ACTIVE (Green)
This indicator illuminates unless a hardware fault on the stepper
controller module is detected causing it to turn off. At power-up
this LED will not illuminate until the PC processor is in run
mode. This indicator will flash on/off if, after power-up, an
invalid expander address is detected, no expander module is
present and/or another stepper controller module is detected in the
same I/O rack.
Expander Module Indicators
Five LED indicators are located on the upper front panel of the pulse
output expander module (Figure 2.4). They perform the following
functions:
•
MODULE FAULT (Red)
This LED is normally off. If an expander module hardware fault
is detected, it will illuminate.
•
OUTPUT PULSE RATE (Green)
This LED is normally on or flashing at the output pulse rate
whenever an output is present.
•
STOP INPUT (Orange)
This LED illuminates when a hardware stop input is asserted.
•
JOG FORWARD (Orange)
This LED illuminates when a hardware jog forward input is
asserted.
•
JOG REVERSE (Orange)
This LED illuminates when a hardware jog reverse input is
asserted.
The stepper positioning system is susceptible to electrical noise
unless the equipment is properly grounded, the cabling is properly
shielded and the power supply(ies) is properly filtered. If not, an
incorrect number of position pulses could result.
Installation