Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 23)

Clutch/Brake Controller Hardware
Chapter 3
3Ć14
Install the keying bands on the I/O chassis backplane connector as shown
in Figure 3.7. After you install keying bands in chassis A and B, you can
insert only a clutch/brake module in the left-most slot of chassis A and B.
Figure 3.7
Keying
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Insert keying bands so that you
can install only a 1771-PM
module in this slot.
12252
Chassis A and B
Keying