Installation - Allen-Bradley 1769 Installation Instructions Manual

6 1769 Compact I/O Communication Bus Expansion Cables

Installation

Prevent Electrostatic Discharge
ATTENTION: Electrostatic discharge can damage integrated
circuits or semiconductors if you touch bus connector pins or the
!
terminal block. Follow these guidelines when handling 1769
Compact I/O components:
• Touch a grounded object to discharge static potential.
• Wear an approved wrist-strap grounding device.
• Do not touch the bus connector or connector pins.
• Do not touch circuit components inside the module.
• If available, use a static-safe workstation.
• When not in use, keep cables in static shield packaging.
Remove Power
ATTENTION: Remove power before making or breaking cable
connections. When you remove or insert a cable connector with
!
power applied, an electrical arc may occur. An electrical arc can
cause personal injury or property damage by:
• sending an erroneous signal to your system's field devices,
• causing an explosion in a hazardous environment
Electrical arcing causes excessive wear to contacts on both the
module and its mating connector. Worn contacts may create
electrical resistance.
Attaching Cables
• A maximum of two expansion cables may be used in a 1769 system.
Note:
• Each I/O bank requires its own power supply. The 1769 cables
extend the 1769 communication bus, but do not extend bus power.
1769-5.15
causing unintended machine motion