Rockwell Automation 1771-VHSC , D17716.5.74 Very High S - Manual (Page 29)

2–3 Installing the Very High-Speed Counter Module
Use the plastic keying bands, shipped with each I/O chassis, for
keying the I/O slot to accept only this type of module.
The module is slotted in two places on the rear edge of the circuit
board. The position of the keying bands on the backplane connector
must correspond to these slots to allow insertion of the module. You
can key any connector in an I/O chassis to receive these modules
except for the leftmost connector reserved for adapter or processor
modules. Place keying bands between the following numbers
labeled on the backplane connector (Figure 2.1):
•
Between 24 and 26
•
Between 28 and 30
You can change the position of these bands if subsequent system
design and rewiring makes insertion of a different type of module
necessary. Use needlenose pliers to insert or remove keying bands.
Figure 2.1
Keying Positions
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
14288
Keying Bands
Upper Connector
Module Keying