Watlow Series D8 - Manual (Page 63)

Doc. 0600-3120-2000 Watlow Anafaze 45
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Communicating by DeviceNet
This chapter explains how to add a D8 series controller to a
DeviceNet network and how to access and manipulate the
controller's data over a network using a Programmable Logic
Controller or other device with a DeviceNet scanner. The
chapter also includes descriptions of the D8's objects and at-
tributes that are accessible via the DeviceNet protocol.
Accessing Data with a DeviceNet Master
Figure 3.12 to Figure 3.15 starting on page 65 illustrate the in-
puts and outputs in the D8 controller's polled I/O messages.
These messages are typically used to get the controller's data
in and out of a master on a DeviceNet network. To use this
data in a Programmable Logic Controller (PLC) these param-
eters must be mapped through the master (scanner) to memory
locations accessible to the PLC or other control devices.
When configuring the number of input bytes, it is important to
note that the first input byte, the Exception Status Byte is not
currently used. When configuring the D8 with DeviceNet net-
work software such as RSNetWorx™, you must offset the
polled input data by one byte. See the example in Mapping
Polled I/O Data on page 50.
Software
More than one software package is available to configure de-
vices such as the D8 on a DeviceNet network. This chapter
provides step-by-step examples of configuring the D8 con-
troller using Rockwell Software’s RSNetWorx. The method-
ology used to accomplish this task will be different in other
software, but the key steps and the end result, a valid stream