Table of Contents
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INTRODUCTION
DESCRIPTION
GLOSSARY
1–2
Document conventions
The following conventions are used throughout this document:
•
Numbered lists provide sequential steps.
•
Bulleted lists provide information, not procedural steps.
•
The term 'user' refers to the person or persons responsible for installing the D485
Modbus to DeviceNet Converter in a network.
•
Hexadecimal values are written in the format 0xNNNN, where NNNN is the
hexadecimal value.
•
Decimal values are represented as NNNN, where NNNN is the decimal value.
•
As in all communication systems, the terms "input" and "output" can be ambiguous,
since their meaning depends on which end of the link is being referenced. The
convention in this document is that "input" and "output" are always being referenced
to the master/scanner end of the link (see illustration below).
•
The term "sub-network" is interchangeably used for "Modbus network".
DeviceNet
master
IN
Slave
The following terminology is used in the D485 manual:
•
Broadcaster: A protocol specific node in the sub-network scan that holds transactions
destined for all nodes.
•
Command: A protocol specific transaction.
•
Fieldbus: The network to which the converter is connected (DeviceNet for D485).
•
Frame: A higher level series of bytes forming a complete telegram on the sub-network
(Modbus).
•
Monitor: A tool for debugging the D485 and network connections.
•
Node: A device in the scan list that defines the communication with a slave (GE relay)
on the Modbus sub-network.
•
Scan list: List of configured slaves with transactions on the sub-network.
•
Sub-network: Modbus network that logically is located on a subsidiary level with
respect to the fieldbus and to which the D485 acts as a gateway.
•
Transaction: A generic building block that is used in the sub-network scan list and
defines the data that is sent out the sub-network.
OUT
DeviceNet network
GE Multilin
D485 Converter
IN
OUT
Modbus
network
Figure 1-1: Input and output definition
D485 MODBUS TO DEVICENET CONVERTER – USER GUIDE
Slave
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