Rockwell Automation Publication 1769-UM021G-EN-P - October 2015 59
Install the CompactLogix 5370 L3 Controller Chapter 3
• 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 65.
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.
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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