Rockwell Automation Allen-Bradley 1769-ASCII, User Manual

Page: 14 / 118

14 Rockwell Automation Publication 1769-UM012B-EN-P - January 2014
Chapter 1 Compact I/O ASCII Module
Assemble the System Attach the module to the controller or an adjacent I/O module before or after
mounting. For mounting instructions, see the
Panel Mount or DIN Rail Mount
sections. To work with a system that is already mounted, see Replace a Module
section.
1.
Disconnect power.
2.
Check that the bus lever of the module to be installed is in the unlocked
(fully right) position.
3.
Use the upper and lower tongue-and-groove slots (1) to secure the
modules together or to a controller.
4.
Move the module back along the tongue-and-groove slots until the bus
connectors (2) align with each other.
5.
Use your fingers or a small screwdriver to push the bus lever back slightly
to clear the positioning tab (3).
6.
Move the bus lever fully to the left (4) until it clicks, to enable
communication between the controller and module.
7.
Verify that it is locked firmly in place.
8.
Attach an end-cap terminator (5) to the last module in the system by using
the tongue-and-groove slots as before.
ATTENTION: Remove power before removing or inserting this module. When
you remove or insert a module with power applied, an electrical arc can occur.
An electrical arc can cause personal injury or property damage by:
• sending an erroneous signal to your system’s field devices, causing
unintended machine motion.
• causing an explosion in a hazardous environment.
Electrical arcing causes excessive wear to contacts on both the module and its
mating connector. Worn contacts can create electrical resistance.
ATTENTION: When attaching I/O modules, it is important that the bus
connectors are securely locked together to be sure of proper electrical
connection.
6
5
4
3
1
1
2