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920i

Installation Manual

Option Cards

The CPU board provides two slots for installing A/D
or other option cards. Additional option cards can be
added using either two-card or six-card expansion
boards connected to the CPU board via the expansion
bus. Available option cards include:

Single- and dual-channel A/D cards to drive up to
sixteen 350

load cells per A/D board, using

single- or dual-channel A/D cards. A/D cards
support both 4- and 6-wire load cell connections.
A/D cards are matched to allow interchangeability
without having to recalibrate the scale. Calibration
includes support for latitude and elevation
compensation, millivolt calibration, and Þve-point
linearization.

Analog output card for 0Ð10 VDC or 0Ð20 mA
tracking of gross or net weight values

Dual-channel serial expansion card provides one
additional RS-485 port or two ports for either
RS-232 or 20mA communications at up to
19200 bps.

24-channel digital I/O expansion card.

1MB memory expansion card for expanded
database capability.

Pulse input card for use with pulse count and
pulse rate setpoints.

Bus interface cards for DeviceNetª

, Remote

I/O

, and ProÞbus

DP networks

Part numbers of available option cards are listed in
Section 10.10 on page 93.

920i

Front Panel

The indicator front panel, shown in Figure 1-1,
consists of a 27-button keypad with a large backlit
L C D d i s p l a y. T h e k e y s a r e g r o u p e d a s Þ v e
conÞgurable softkeys, Þve primary scale function
keys, four navigation keys, and numeric entry keys.
The display can be graphically conÞgured using

iRev

software.

Weight information is displayed with a graphical scale
in six font sizes up to 1.2 inches. Up to four scale
w i d g e t s c a n b e d i s p l a y e d i n l eg a l - f o r- t r a d e ,
multiple-scale applications. status areas on the display
are used for operator prompts and entering data. The

remainder of the display can be graphically conÞgured
for representation of a speciÞc application. Display
contrast can be adjusted with the LCD contrast
potentiometer.

Figure 1-1.

920i

Front Panel

Enclosures

The

920i

is available in four enclosures: universal

(tilt-stand), desktop, panel mount, and wall mount.
Stainless steel enclosures are rated for NEMA
4X/IP66. This manual provides assembly drawings
and replacement parts lists for the universal and
desktop models; supplemental documentation
provides information speciÞc to the panel mount and
wall mount models (Section 10.11 on page 94).

1.1

Operating Modes

The

920i

has two modes of operation:

Normal mode

Normal mode is the weighing mode of the
indicator. The indicator displays gross, net, or tare
weights as required, using the secondary display
to indicate scale status and the type of weight
value displayed. Once conÞguration is complete
and a legal seal is afÞxed to the large Þllister-head
screw on the indicator enclosure, this is the only
mode in which the

920i

can operate.

Setup mode

Most of the procedures described in this manual
require the indicator to be in setup mode,
including conÞguration and calibration.

To enter setup mode, remove the large Þllister head
screw from the enclosure. Insert a screwdriver or a
similar tool into the access hole and press the setup
switch once. The indicator display changes to show
scale conÞguration menus.

DeviceNet™ is a trademark of the Open DeviceNet Vendor

Association.

Allen-Bradley

, PLC

, and SLC

™

are trademarks of Allen-Bradley

Company, Inc., a Rockwell International company.

Profibus

is a registered trademark of Profibus International.

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