Getting Started
Installation and
Safety Guidelines
1–4
Getting Started
D0–DEVNETS DeviceNet Slave
Module User Manual, Rev A
Introduction to DeviceNet
DeviceNet is a low-cost control bus used to connect field devices to PLCs and PCs.
DeviceNet is designed to reduce the need for hard–wiring while providing
device–level diagnostics. There are a host of manufacturers of DeviceNet products,
offering an array of products including sensors, motor drives and starters, PLCs,
pushbuttons, remote I/O systems, etc.
Here are some DeviceNet concepts you may find helpful.
•
DeviceNet supports various communication structures including Peer to
Peer, Multi-master and Master/Slave.
The D0–DEVNETS uses the
predefined Master/Slave connection.
•
DeviceNet has two types of messaging: Explicit Messaging and I/O
Messaging.
•
Explicit Messaging is low priority, not time-critical and usually
for configuration/diagnostic purposes.
•
I/O Messaging is time-critical and high priority
for I/O data transfer. I/O Messaging comes in four types:
•
Strobed
•
Polled
(The D0–DEVNETS only supports Polled.)
•
Change of State (or COS)
•
Cyclic
•
A single DeviceNet network is limited to 64 nodes. A node can be a
single-bit device, such as a limit switch, or a remote I/O slave with
several I/O modules, such as the D0–DEVNETS. The Master (Scanner)
is usually assigned to node address 0, and many Slave devices have a
factory default node address of 63.
•
DeviceNet has the following data rates (with maximum bus lengths):
•
125 kbps (bus length = 500m max.)
•
250 kbps (bus length = 250m max.)
•
500 kbps (bus length = 100m max.)
•
The 24V DeviceNet power supply must be grounded at only one point.
The V– terminal must be connected to Protective Earth Ground at the
power supply only.
The DeviceNet standard is maintained by the ODVA (Open DeviceNet Vendor
Association, Inc.). Contact the ODVA for detailed information about DeviceNet.
Open DeviceNet Vendor Association, Inc.
20423 State Road 7
Suite 499
Boca Raton, FL 33498
Phone: (954) 340–5412
Fax: (954) 340–5413
Internet:
www.odva.org
Email: [email protected]
DeviceNet
Concepts
The ODVA
Summary of Contents for D0-DEVNETS
Page 1: ...D0 DEVNETS DeviceNet Slave Module User Manual Manual Number D0 DEVNETS M...
Page 24: ...1A Specifications In This Appendix Specifications...
Page 27: ...1B Tables In This Appendix DeviceNet Tables...
Page 34: ...1C Image Table Mapping In This Appendix Image Table Mapping...
Page 44: ...1E D0 DEVNETS Think Do Entivity Setup In This Appendix D0 DEVNETS Think Do Entivity Setup...
Page 52: ...1F OIT with D0 DEVNETS In This Appendix OIT with D0 DEVNETS and Think Do Entivity...