Sel 551 - Page 203

A.7
Date Code 20110408 Instruction Manual SEL-551 Relay
Firmware and Manual Versions
Instruction Manual
Section 5
➤ Added details concerning the optional front-panel EIA-232 serial communications port for the SEL-551C.
➤ Added explanation on the factory settings listed in SHO Command (Showset) that differ for the new
SEL-551C, compared to the SEL-551.
➤ Under TAR Command (Target), created separate Relay Word bit table for the SEL-551C, showing Relay Word
bits IN1–IN6 and OUT1–OUT3 for the new digital I/O mix and latch bit outputs LT1–LT8.
➤ Added programmable software and hardware alarm Relay Word bits SALARM and HALARM, respectively,
for the SEL-551C.
➤ Added Relay Word bit TRGTR (Target Reset output).
➤ Under PAS Command (Password), added password security enhancement explanation.
➤ Added VER Command.
Section 7
➤ Explained the rearrangement of digital I/O columns in the event report for the new SEL-551C.
➤ Clarified the number of rows available in the SER for each relay.
Section 8
➤ In Relay Self-Tests, explained the programmable alarm output contact feature in the SEL-551C.
Appendix A
➤ Updated for firmware version R509 for the SEL-551 and firmware version R500 for the new SEL-551C.
Appendix D
➤ Added new DNA message for the new SEL-551C. Changed DNA message for SEL-551.
➤ Expanded ID message explanation.
Appendix E
➤ Added Compressed ASCII command responses for the SEL-551C.
Appendix G
➤ Added new Modbus updates for the new SEL-551C, primarily because of the new digital I/O mix and target
LED rearrangement.
20030905
Section 1
➤ Modified text in CT Saturation Protection.
Section 3
➤ Modified text in Phase Instantaneous Overcurrent Elements.
Section 7
➤ Modified text in Standard Event Report Summary.
Appendix A
➤ Updated for firmware version R109 and R508.
20021025
Section 1
➤ Modified Optoisolated Input Ratings information in General Specifications.
Section 2
➤ Modified text in Control Voltage Jumpers (Conventional Terminal Blocks Option Only).
20020828
Section 1
➤ Updated the Tightening Torque information.
➤ Added information on CT Saturation Protection.
Section 2
➤ Updated the relay figures.
Section 4
➤ Added CT sizing information.
Section 5
➤ Updated the Command Summary.
Table A.2 Instruction Manual Revision History (Sheet 5 of 8)
Revision Date Summary of Revisions