User`s manual

Watlow EZ-ZONE™ Communications • 40 • Chapter 4 DeviceNet

Chapter 4 DeviceNet

Introduction to DeviceNet

DeviceNet is a low-cost communication link that connects industrial devices over a common network

(such as: Watlow temperature controllers, limit switches, photoelectric sensors, proximity sensors, valve

manifolds, motor starters, process sensors, bar code readers, variable frequency drives, panel displays, and

operator interfaces) to higher-level devices such as programmable controllers and computers. DeviceNet, like

EtherNet/IP uses the proven Common Industrial Protocol (CIP) to provide the control, configuration, and

data collection capabilities for industrial devices. Being that this is an open protocol there are many inde-

pendent vendors offering a wide array of devices to the end user. There are four components needed to read

and or write any parameters to the PM control:

1. Node address or MAC ID (0 - 63)

2. Class ID (1 to 255)

3. Instance ID (0 to 255)

4. Attribute ID (1 to 255)

Since both DeviceNet and EtherNet/IP use CIP you will find the class, instance, and attributes in the tables

that follow (Operations, Setup, Profile and Factory) are the same.

DeviceNet Communications

Although it is not an ODVA requirement for each node in a deviceNet network to have a Module Status

and a Network Status indicator the EZ-ZONE™ PM does. The meaning of each of these LEDs is defined in

table 1 and 2 below.

Table 1. Module Status (MOD) Indicator LED

Indicator LED Description

Off No power is applied to the device.

Flashing Green-Red The device is performing a self-test.

Flashing Red Major Recoverable Fault.

Red Major Unrecoverable Fault.

Green The device is operating normally.

Table 2. Network Status (NET) Indicator LED

Indicator LED Description

Off

The device is not online. The device has not complet-

ed the duplicate MAC ID test yet. The device may

not be powered..

Green

The device is online and has connections in the es-

tablished state. For a Group 2 Only device it means

that the device is allocated to a Master.

Red

Failed communication device. The device has de-

tected an error that has rendered it incapable of

communicating on the network (duplicate MAC ID or

Bus-off).

Flashing Green

The device is online, but no connection has been al-

located or an explicit connection has timed out.

Flashing Red A poll connection has timed out.