Rockwell Automation 193-EC1_2_3_5, 193-ECPM,592-EC1_2_3_5 E3 and E3 Plus Solid-State Overload Relay User Manual - Manual (Page 201)

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 201
Logic Controller Communication Examples Chapter 10
Reading a Group of Parameters using the E3 Status Object Class
(0x0375)
In this example, a Periodic Task has been configured within the L32E to execute
every 1000 ms. In this task, one message instruction will be used to read 25
parameters that include data from the voltage, current, real power, reactive power,
apparent power, and power factor groups using the E3 Status Object Class
(included in firmware revision number 5.01 and higher). The supporting ladder
logic was added to execute a MSG instruction every time this Periodic Task
executes.
The E3 Status Object allows a user to define which groups of parameters to read
from a single message instruction. Set up an array of integers to define the list of
attributes (parameter groups) to read back from E3 Overload relay with firmware
revision 5.01 and higher. The list of attributes for the E3 Status object is show in
Appendix B. For this example, the message instruction will read back the
following attributes (parameter groups):
• Attribute 1 – Current
• Attribute 15 – Voltage
• Attribute 17 – Real Power (kW)
• Attribute 18 – Reactive Power (kVAR)
• Attribute 19 – Apparent Power (kVA)
• Attribute 20 – Power Factor
In the integer array named MSG_Read_Request, define the number of attributes
to read and list the specific attribute numbers:
The data will return in an integer array with the first integer representing the
following information:
• Number of Attributes
• First Attribute Number Being Returned
• First Attribute Number Data Status
• First Attribute Data