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Chapter 4
Configuration
MAN_905G_1.16
Page 124
network configuration. The EDS file can either be downloaded from the ELPRO website
(
www.elprotech.com)
, or found on the Product CD supplied with the module.
4.12.4
Protocol and Supported Functions
The 905G DeviceNet module is implemented according to the ODVA specification for a
communication adapter (profile no 12) and acts as a group two only server on the DeviceNet
network.
The 905G DeviceNet supports the following connection types:
•
Explicit Messaging
•
Polled I/O
•
Bit-strobed I/O
•
Change-of-state / Cyclic I/O
The 905G DeviceNet supports up to 512 bytes of input and 512 bytes of output data via the
DeviceNet interface. I/O Data exchange with a DeviceNet Scanner can be performed using
any of the above connection types. DeviceNet Scanner configuration towards the 905G is
possible via an EDS file.
DeviceNet is based on the Control and Information Protocol (CIP), which is also the
framework for both ControlNet and Ethernet/IP, to carry and exchange data between nodes.
The 905G supports the mandatory objects as well as some vendor specific objects. The
mandatory objects are the ones in the specification from ODVA. The following vendor
specific objects are implemented:
• I/O data input mapping object, Class A0h
• I/O data output mapping object, Class A1h
Since theses objects are the same as for Ethernet/IP, for the specification of these objects see
section ‘4.10.3 Ethernet/IP’. For further examples refer to the 905G DeviceNet Application
Note.
4.13
Fieldbus Configuration – Modbus Plus
4.13.1
Modbus Plus Introduction
Modbus Plus is a local area network system designed for industrial control and monitoring
applications. The network enables programmable controllers, host computers and other
devices to communicate throughout plants and substations. Modbus Plus is normally used in
industrial automation, to transfer fast data for motor controllers, MMI, I/O units and other
industrial equipment.
The 905G Modbus Plus module communicates according to the Modbus Plus Protocol. This
means that it can communicate with all Modbus Plus nodes that comply with this protocol,
but it does not necessarily mean that all services available in the Modbus Plus protocol are
supported.
4.13.2
Modbus Plus Addressing
Modbus Plus node addressing can be set using switches or via configuration software. To use
the switch address settings, the “Enable Switch Address” option in configuration software
must be selected, otherwise switch settings are ignored. NOTE – software address