72 Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Chapter 3 Start Using the Controller
Other Memory Card Tasks
Other tasks that you may need to complete by using the memory cards of the
controller include the following:
• Changing the image that is loaded from the card
• Checking for a load that was completed
• Clearing an image from the memory card
• Storing an empty image
• Changing load parameters
• Reading/writing application data to the card
For more information about completing any of these tasks, see the Logix5000
Controllers Memory Card Programming Manual, publication 1756-PM017
.
Use ControlLogix Energy
Storage Modules (ESMs)
You can use the ControlLogix ESMs to execute either of the following tasks:
• Provide power to 1756-L7x controllers to save the program to the
controller’s on-board nonvolatile storage (NVS) memory after power is
removed from the chassis or the controller is removed from a powered
chassis.
• Clear the program from the 1756-L7x controller’s on-board NVS memory.
For more information, see Clear the Program from On-board NVS
Memory.
The following table describes the ESMs.
When you are using an ESM to save the program to on-board NVS
memory, you are not saving the program to the SD card installed in the
controller.
Cat. No. Description
1756-ESMCAP Capacitor-based ESM
The 1756-L7x controllers come with this ESM installed.
1756-ESMNSE Capacitor-based ESM without WallClockTime back-up power
Use this ESM if your application requires that the installed ESM deplete its residual stored
energy to 40µjoules or less before transporting it into or out of your application. Additionally,
you can use this ESM with a 1756-L73 (8MB) or smaller memory-sized controller only.
1756-ESMNRM Secure capacitor-based ESM (non-removable)
This ESM provides your application an enhanced degree of security by preventing physical
access to the USB connector and the SD card.
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