Allen-Bradley SLC 500 Manual Del Usuario página 7

ATTENTION: If the chassis mounting tabs do not lay flat
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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.
Slide the chassis over the installed hardware and tighten the screws.
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Leaving far-left and far-right tabs open for grounding, install the
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remaining tab hardware (for a four-slot chassis, leave both tabs open).
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Installation Instructions
SLC 500 Modular Chassis
1746-A4, -A7, -A10, -A13 Series B
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