TTL Input Module
Cat. No. 1771IGD
Installation Instructions
3
You select high-true or low-true using the jumper accessible through a slot
at the top of the module.
1.
Locate the jumper in the slot at the top edge of the module.
2.
Use tweezers to position the jumper as required for your application.
When on front 2 pins, negative logic
selected (low = true).
TTL Input Module
When on rear 2 pins, positive logic
selected (high = true).
10449I
TTL Logic Level Selection Jumper Assembly
Keying Your I/O Chassis
Use the plastic keying bands, shipped with each I/O chassis, to key the I/O
slots to accept only this type of module.
The module circuit board is slotted in two places on the rear edge. 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 this module except for the left-most connector
reserved for adapter or processor modules. Place keying bands between the
following numbers labeled on the upper backplane connector:
Between 16 and 18
Between 24 and 26
You can change the position of these keys if system redesign and rewiring
makes insertion of a different module necessary.
Installing the Input Module
To install the TTL input module in your 1771 I/O chassis, follow the steps
listed below.
