Rockwell Automation 1771-QC , D17716.5.25 SER/B SERVO POS - Manual (Page 38)

Chapter
5
5Ć1
Hardware Description
The previous chapter described how the servo positioning assembly fits
into a positioning system as part of a programmable controller. This
chapter describes specific hardware of the servo positioning assembly and
lists its specifications. This chapter also describes other hardware items
you need for a positioning system.
There are three indicators on the 1771-M3 controller. With the PC
processor operating in the run mode, the indicators have the following
functions:
Processor Communication Fault - This red indicator turns on
when the module detects a fault in the communication
between it and the PC processor. The I/O adapter module or
PC processor will not detect this as a fault.
Expander Communication Fault - This red indicator turns on
when the module detects a fault in the communication
between it and a 1771-ES expander.
Active - This green indicator is normally on. It turns off
when a hardware fault is detected on a 1771-ES expander. it
blinks if you have not properly configured the modules.
There are six indicators on the 1771-ES expander. With the PC processor
operating in the run mode, the indicators have the following functions:
Module Active - This green indicator is on when the module
is operating normally.
Marker - This green indicator is on when the channel A,
channel B, and marker signals are true simultaneously.
Home - This green indicator is on when the axis is in the
home position.
Tach Calibrate - This green indicator is used in setting the
adjustments for loss of feedback detection.
Hardware Stop - This red indicator goes on when the
hardware stop input opens. It stays on until the input closes
and the servo expander module is reset.
Diagnostic - This red indicator goes on when a fault is
detected at the servo expander module.
Chapter Objectives
Indicators