AB 1771-WA

These modules contain input filtering to limit the effects of voltage

transients caused by contact bounce and/or radiated electrical noise. The

delay due to filtering is nominally 24+10ms for turning ac inputs on or off;

and 10+4ms for turning dc inputs on, 20+9ms for turning dc inputs off.

These modules are designed to operate with ac proximity switches such as

Allen–Bradley Bulletin 871P and other input devices with an off–state

leakage current less than 2.8mA.

Description:

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 backplane connector:

Between 4 and 6

Between 10 and 12

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 AC/DC input module in your 1771 I/O chassis, follow the

steps listed below.

ATTENTION: Remove power from the 1771 I/O chassis

backplane and wiring arm before removing or installing an I/O

module.

Failure to remove power from the backplane or wiring arm

could cause module damage, degradation of performance, or

injury.

Failure to remove power from the backplane could cause

injury or equipment damage due to possible unexpected

operation.

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