Rockwell Automation Publication 1769-UM021I-EN-P - May 2018 163
Use I/O Modules with CompactLogix 5370 L1 Controllers Chapter 7
Empty Slots and Removal and Insertion Under Power Situations
The POINT I/O system cannot detect an empty terminal base. For this
reason, there are numerous situations in which you can potentially configure a
system that is unusable or one that exercises unintended control.
Follow these rules for I/O system configuration and RIUP of I/O modules.
• A correct I/O system does not have any empty terminal bases. If
necessary, you can use a 1734-ARM POINT I/O Address Reserve
module to replace a 1734 POINT I/O module in a CompactLogix
5370 control system.
• After you cycle power, the controller only enables I/O connections if the
number of local expansion modules present on POINTBus matches the
value that is used for the Expansion I/O parameter in the project.
• If a 1734 POINT I/O module is removed under power, the operation of
the other I/O modules is not disrupted.
• When you remove an I/O module that has an active connection from
the controller, the controller I/O status indicator flashes green to
indicate the condition.
WARNING: If you insert or remove the module while backplane
power is on, an electrical arc can occur. This could cause an explosion
in hazardous location installations.
Be sure that power is removed or the area is nonhazardous before
proceeding.
IMPORTANT 1734 POINT I/O modules support RIUP in CompactLogix 5370 L1
control systems.
IMPORTANT If you enabled the 'Major Fault On Controller If Connection Fails
While in Run Mode' parameter when configuring the module in the
Studio 5000® environment project, removal of the module causes
the controller to transition to a major fault condition.
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