Rockwell Automation 1756-SPESMNRMXT GuardLogix Controllers User Manual - Manuel (Page 122)

122 Rockwell Automation Publication 1756-UM020I-EN-P - August 2012
Chapter 8 Store and Load Projects Using Nonvolatile Memory
Use Energy Storage Modules
(1756-L7xS controllers only) You can use the GuardLogix ESMs to execute either of the following tasks:
• Provide power to 1756-L7xS controllers 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 1756-L7xS 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 37 - Energy Storage Modules
Cat. No. Description
1756-ESMCAP(XT) Capacitor-based ESM
The 1756-L7xS 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 deplete its residual stored
energy to 200
μ
J or less before transporting it into or out of your application. Additionally, you
can use this ESM with a 1756-L73S (8MB) or smaller memory-sized controller only.
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 200
μ
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