Rockwell Automation 1757-SWKIT5000 ProcessLogix R500.1 Installation and Upgrade Guide - Manual (Page 189)

Publication 1757-IN500A-EN-P - September 2002
Firmware Maintenance Procedures 7-9
Loading 1757-PLX52, TC-MUX021, or 1757-FIM Boot and
Personality Images
Use the following procedures to update the ROM boot code and personality
images in an existing 1757-PLX52, TC-MUX021 or 1757-FIM module. You
must repeat these procedures for all 1757-PLX52, TC-MUX021 and
1757-FIM modules in your system.
ATTENTION
!
Be certain that your process is off control before you begin
any upgrade procedure. This means the 1757-PLX52
should be in the Idle state.