Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 98)

Rockwell Automation Publication 193-UM011A-EN-P - September 2010 99
Logic Controller Application Example with Explicit Messaging Chapter 9
For more information on configuring the scanlist of a DeviceNet Scanner, refer
to DeviceNet Node Commissioning on page 4-48.
Explicit Messaging The EC4 Current Monitoring Relay supports Explicit Messaging via DeviceNet.
This allows a controller to read and write various parameters from an EC4
Current Monitoring Relay. In this example, a CompactLogix L32E controller
will read three parameters from the EC4 located on Node 6 on a DeviceNet via
Explicit Messaging using various Object Classes and storing the information in an
array of Integer_Files.
Reading Device Status using the Parameter Object Class (0x0F)
In this example a Periodic Task has been configured within the L32E to execute
every 1000 msec in which a message instruction will be used to read the Device
Status of the EC4 Current Monitoring Relay using the Parameter Object Class.
The supporting ladder logic was added to execute a MSG instruction every time
this Periodic Task executes
.