Rockwell Automation Allen-Bradley SLC 500 Mode D'emploi page 8

8 SLC 500™ Modular Chassis
3. Slide the chassis over the installed hardware and tighten the screws.
ATTENTION
!
4. Leaving far-left and far-right tabs open for grounding, install the remaining
tab hardware (for a four-slot chassis, leave both tabs open).
Publication 1746-IN016C-MU-P - December 2003
If the chassis mounting tabs do not lay flat before the
screws are tightened, use additional washers as shims
so that the chassis will not be warped by tightening
the screws. Warping a chassis could damage the
backplane and cause poor connections.