Rockwell Automation Publication 1769-UM021I-EN-P - May 2018 71
Install the CompactLogix 5370 L3 Controller Chapter 4
• Each I/O bank requires its own power supply.
• You must terminate the end of the last bank in a CompactLogix 5370 L3
control system. You can terminate a bank at the left or right end of the
bank dependent upon your system design.
A 1769-ECx end cap is required to terminate the end of the last bank in
the control system.
For example, if a CompactLogix 5370 L3 control system uses one bank,
you must use a 1769-ECR right end cap to terminate the right end of the
bank.
For graphics of CompactLogix 5370 L3 control systems that use one
bank or multiple banks, see Mount the System on page 78
.
CompactLogix 5370 L3 Controller Parts
These parts are included in the box when you order your controller:
• Controller - Specific catalog number varies by order
• 1784-SD1 Secure Digital (SD) card with 1 GB of memory storage
A 1784-SD2 SD card with 2 GB of memory storage, or more 1784-SD1
SD cards, are also available if you need more memory.
ATTENTION: The CompactLogix 5370 L3 control systems do not
support removal and insertion under power (RIUP). These events
occur while the CompactLogix system is under power:
• Any break in the connection between the power supply and the
controller, for example, removing the power supply, controller, or an
I/O module, can subject the logic circuitry to transient conditions
above the normal design thresholds and can result in damage to
system components or unexpected behavior.
• Removing an end cap or an I/O module faults the controller and can
also result in damage to system components.
IMPORTANT The life expectancy of nonvolatile media is dependent on the
number of write cycles that are performed. Nonvolatile media use a
wear leveling technique or technology for prolonging the service
life, but avoid frequent writes.
Avoid frequent writes when logging data. We recommend that you
log data to a buffer in the memory of your controller and limit the
number of times data is written to removable media.
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