Allen-Bradley GuardLogix 5570, User Manual

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138 Rockwell Automation Publication 1756-UM022D-EN-P - May 2017
Chapter 8 Store and Load Projects Using Nonvolatile Memory
Use Energy Storage Modules You can use the GuardLogix ESMs to execute either of the following tasks:
• Provide power to the controller to save the program to the controller’s
on-board non-volatile storage (NVS) memory after power is removed
from the chassis or the controller is removed from a powered chassis.
• Clear the program from the controller’s on-board NVS memory. For
more information, see Clear the Program from On-board NVS Memory
The following table describes the ESMs.
Save the Program to On-board NVS Memory
Follow these steps to save the program to NVS memory when the controller
loses power.
1. Remove power from the controller.
You can remove power in either of two ways:
• Turn power off to the chassis while the controller is installed in the
chassis.
• Remove the controller from a powered chassis.
IMPORTANT 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.
Table 42 - Energy Storage Modules
Cat. No. Description
1756-ESMCAP(XT) Capacitor-based ESM
The controllers come with this ESM installed.
1756-ESMNSE(XT) Capacitor-based ESM without WallClockTime backup power
Use this ESM if your application requires that the installed ESM depletes its residual stored
energy to 40

J or less before transporting it into or out of your application. Also, you can
only use this ESM with a 1756-L73S (8MB) or smaller memory-sized controller.
1756-ESMNRM(XT) 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.
1756-SPESMNSE(XT) Capacitor-based ESM without WallClockTime backup power for the safety partner
Use this ESM if your application requires that the installed ESM deplete its residual stored
energy to 40

J or less before transporting it into or out of your application.
The 1756-L7SPXT extreme temperature safety partner ships with the 1756-SPESMNSEXT
installed.
1756-SPESMNRM(XT) Secure capacitor-based ESM (non-removable) for the safety partner