Allen-Bradley micrologix 1500, User Manual

Page: 14 / 149

Publication 1764-UM001A-US-P
1-6 Hardware Overview
Adding an I/O Bank
System Guidelines
A maximum of one 1769 Expansion Cable can be used in a MicroLogix 1500
system, allowing for two banks of I/O modules (one connected directly to the
controller, and the other connected via the cable). Each I/O bank requires its own
power supply (Bank 1 uses the controller’s embedded power supply).
ATTENTION
!
ATTENTION: LIMIT OF ONE EXPANSION POWER
SUPPLY
The expansion power supply cannot be connected directly to the
controller. It must be connected using one of the expansion
cables. Only one power supply (embedded or expansion) may be
used on an I/O bank. Exceeding these limitations may damage
the power supply and result in unexpected operation.
ATTENTION
!
ATTENTION: REMOVE POWER
Remove system power before making or breaking cable
connections. When you remove or insert a cable connector with
power applied, an electrical arc may 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 operation
•
causing an explosion in a hazardous environment
Electrical arcing causes excessive wear to contacts on both the
module and its mating connector.
Refer to your power supply and I/O module’s documentation for
instructions on how to set up your system.