Rockwell Automation 1756-Lx_Mx ControlLogix Controller and Memory Board Installation Instructions - Manual (Page 9)

ControlLogix Controller and Memory Board 9
Publication 1756-IN101L-EN-P - June 2008
Replace a Suspected Failed Controller
To replace a failed controller, do the following.
1. Cycle power to the chassis.
2. Make sure the OK status indicator is
solid red, noting that if the OK status
indicator is not solid red, the controller
does not require replacement.
3. Match the catalog numbers of the
controllers and memory boards, noting
that 1756-Mxxx is the catalog number of
the memory board, if one is installed, and
1756-Lxxx is the catalog number of the
controller, as shown in the figure.
ControlLogix
1756-M…
CAT. NO./SERIES
ControlLogix
1756-L…
CAT. NO./SERIES
1756-M...
1756-L...