Spectrum Controls 1771sc-IMI16 User Manual

Page 2

Important Pre-Installation
Considerations

This module must be used with a 1771 Series B (or later) I/O chassis.

This module contains input filtering to limit the effects of voltage transients
caused by contact bounce and/or radiated electrical noise. This filtering cannot
be turned off. The delay due to filtering is:

• Off to On

6 ms for AC

2 ms for DC

• On to Off

8 ms for AC

7 ms for DC

This module is designed to operate with input devices such as limit switches,
float switches, selector switches, push-buttons, and proximity switches. A
simplified schematic for this module appears in Figure 1.

Figure 1
Simplified Schematic

The module is shipped in a static-shielded container to guard against electrostatic
discharge damage. Observe the following precautions when handling the module:

CAUTION

ELECTROSTATICALLY SENSITIVE COMPONENTS

Observe the following precautions to guard against electrostatic damage:

Wear an approved wrist strap grounding device, or touch a grounded
object to discharge yourself before handling the module.

Do not touch the gold backplane connector or connector pins.

If available, use a static-free work station.

Keep the module in a static-shielded bag when not in use or during
shipment.

Failure to observe these precautions can degrade performance or damage the
module.

Installation Data

AC/DC (220/240 V) Input Module
Cat. No. 1771sc-IMI16

System

Circuitry

(filtering)

Opto

Isolation

Input

Indication

LED

1771

Backplane

56.2 k½

0.15 µf

250 ½

AC High

or DC Positive

AC Low

or DC Common