Rockwell Automation 4100 ALEC AXIS LINK ENCODER CONVERTER - Manual (Page 15)

7 Publication 4100-5.3 - June 1999
Chapter
1
Overview
ALEC Description The ALEC is a single-axis AxisLink Encoder Converter which interfaces
a single incremental encoder to Allen-Bradley IMC S Class motion
controllers via AxisLink. As such, it provides a master encoder input
for IMC S Class motion controllers or 1394 GMC systems without the
need to sacrifice a full servo axis for use as a master encoder input.
The ALEC also allows easy remote location of the master encoder for
connection to an existing machine.
AxisLink is an IMC S Class option which links multiple motion
controllers and ALECs to provide real-time axis coordination between
their axes in distributed multi-axis systems. The ALEC encoder
appears to the AxisLinked IMC S Class motion controllers as a virtual
axis. This virtual axis can be used by the motion controllers as a
master axis in electronic gearing, cam, lineshaft, and synchronization
applications.
ALEC Features The ALEC has the following features:
•
Plug and Play - no software setup required.
•
Single 18-36V DC power input with reverse voltage protection
makes installation and hookup easy.
•
Isolation of all external connections from the microprocessor
logic for reliable performance.
•
4MHz maximum feedback count rate allows high speed
operation without sacrificing resolution.
•
Optically isolated high-speed position registration input for
position synchronization and registration applications.
•
Interfaces directly to Allen-Bradley 1394 GMC System and
S Class Compact motion controllers.
•
Normally Open status output.
•
Bicolor LED status indication.
•
Pre-engineered encoder cable assemblies available.
•
A rugged steel case for greater protection. The case has
pre-drilled mounting tabs.
The ALEC is based on an 80C31 microprocessor running at 16MHz. A
CPU watchdog circuit with front panel LED indicator (CPU OK) is
provided for fault indication and connection to a Normally Open Fault
Relay.