Rice Lake 920i Programmable HMI Indicator/Controller - DeviceNet Interface - Manual (Page 5)

Introduction 1
About This Manual
This manual provides information needed to install
and use the Rice Lake Weighing Systems DeviceNet
Interface. The DeviceNet
TM Interface allows 520 ,
720i ® , 820i ® , and 920i ® indicators to communicate
with a master controller on a DeviceNet network. 1 See
the 520 , 720i , 820i , or 920i Installation Manual for
additional installation information and detailed
descriptions of indicator functions.
The DeviceNet Interface is installed inside the
indicator enclosure. Installation in NEMA 4X
stainless steel enclosures permits use in washdown
environments.
Some procedures described in this manual
require work inside the indicator enclosure.
These procedures are to be performed by
qualified service personnel only.
Authorized distributors and their employees
can view or download this manual from the
Rice Lake Weighing Systems distributor site
at
www.ricelake.com .
1.0 Introduction
The DeviceNet Interface returns weight and status information from a 520 , 720i , 820i , or 920i indicator to a
master controller and provides limited control of indicator functions to the programmer. Indicator configuration
and calibration cannot be performed through the DeviceNet Interface.
The DeviceNet Interface functions as a Communications Adapter Device (ODVA profile 12) on a DeviceNet
network. It acts as a group-two-only server on the network. At this time only one polled I/O connection is
supported, though DeviceNet also supports explicit, bit-strobed, and change-of-state/cyclic connections. These
connections may be included at a later date.
The master controller sends commands to the indicator through the DeviceNet Interface by writing the
commands in the output command format. The DeviceNet Interface returns the weight and status data in the
input command format. These actions are referred to as polled I/O. See Section 3.0 for descriptions of the polled
I/O commands.
1. DeviceNet™ is a trademark of the Open DeviceNet
Vendor Association.
W arning