Install the QDC Module
Chapter 2
2-5
Use the plastic keying bands, shipped with each I/O chassis, for keying I/O
slots to accept only one type of module. This is done to prevent the
inadvertent installation of the wrong module into the wrong slot.
The QDC 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.
Place keying bands between the following terminal numbers labeled on the
backplane connector of your I/O chassis (see Figure 2.2):
between 20 and 22
between 26 and 28
Figure 2.2
Keying Positions
2
4
6
8
1 0
1 2
1 4
1 6
1 8
2 0
2 2
2 4
2 6
2 8
3 0
3 2
3 4
3 6
12676
Keying
Bands
1771QDC
Install your QDC module in an I/O chassis with these steps:
1.
First, turn off power to the I/O chassis.
ATTENTION: Remove power from the 1771 I/O chassis
backplane and wiring arm before removing or installing a QDC
module.
Failure to remove power from the backplane could cause injury
or equipment damage due to possible unexpected operation.
Key Your I/O Chassis
Install the QDC Module