Rockwell Automation 825-P Modular Protection System for Motors User Manual - Manual (Page 235)

Rockwell Automation Publication 825-UM004D-EN-P - November 2012 235
Appendix
C
Relay Word Bits
Overview The protection and control element results are represented by Relay Status bits in
the 825-P relay. Each Relay Status bit has a label name and can be in either of the
following states:
• 1 (logical ON)
• 0 (logical OFF)
Logical ON represents an element being picked up or otherwise asserted. Logical
OFF represents an element being dropped out or otherwise de-asserted.
The Relay Word bits are collected into a table of 10 rows, each row containing 8
bits. The collection is called the Relay Word.
Table 112 shows a list of Relay Status bits and their descriptions. The Relay Word
bit row numbers correspond to the row numbers used in the TAR command in
MPS Explorer Software. For access from the front panel, use the following menu
path:
Main Menu > Targets
Table 113 shows additional Relay Word bits that are not available for output
mapping or for the display using the TARGET command. These bits are used
in the relay Sequential Events Recorder (SER) records. (Chapter 8: Analyzing
Events).
Definitions
Table 112 - Relay Word Bit Definitions for the 825-P (Sheet 1 of 4)
Row # Bit Definition
0 ENABLE 7 front panel
ENABLE LED.
TRIP 6 front panel TRIP LED (see Chapter 3: Front Panel Operation)
* 5 Reserved for future use.
* 4 Reserved for future use.
* 3 Reserved for future use.
* 2 Reserved for future use.
* 1 Reserved for future use.
* 0 Reserved for future use.