32 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Chapter 2 Install Your Controller
Figure 9 - Attach Expansion I/O
Use the pull loop on the connector to disconnect modules. Do not pull on the ribbon
cable.
Up to seven expansion I/O modules can be connected to a controller.
ATTENTION: Remove power before removing or inserting an I/O module. When
you remove or insert a module 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 the controller
to fault
• causing an explosion in a hazardous environment
Electrical arcing causes excessive wear to contacts on both the module and its
mating connector. Worn contacts may create electrical resistance, reducing
product reliability.
WARNING: EXPLOSION HAZARD
In Class I, Division 2 applications, the bus connector must be fully seated and the
bus connector cover must be snapped in place.
In Class I, Division 2 applications, all modules must be mounted in direct contact
with each other as shown on page 23. If DIN rail mounting is used, an end stop
must be installed ahead of the controller and after the last 1762 I/O module.
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