A.5
Date Code 20171021 Instruction Manual SEL-421 Relay
Firmware, ICD File, and Manual Versions
Firmware
➤ Added Isolated IP mode (NETMODE = ISOLATEIP) which permits
IEC 61850 GOOSE messages on two ports but restricts IP traffic to just
one port.
➤ Added pulsed remote bits in Automation SELOGIC.
➤ Added FRQST and PMLEGCY settings to maintain backward settings
compatibility.
➤ Added aliasing capability for the phasors, analogs, and digitals in the
synchrophasor data.
➤ Enhanced the report time records to save the active UTC offset
(UTCOFF) value with each report. Now, when the relay collects a
report, it assigns the time stamp based on the UTC time and the
UTCOFF value at the time the relay stores the report.
➤ Removed the port uniqueness requirements for the PMOUDP1 and
PMOUDP2 settings.
➤ Enhanced the embedded HTTP server user interface to be consistent
with other SEL relays.
➤ Improved the Sequential Events Recorder (SER) resolution to 0.5 ms for
level sensitive contact inputs.
➤ Modified the relay to support MMS file transfer service even if the relay
contains an invalid CID file.
➤ Modified the embedded HTTP server web access to always require a
valid relay Access Level 1 (ACC) password.
➤ Updated the maximum and minimum line metering data (MET M com-
mands) to display local time for all data.
➤ Reset the port timeout on transmitted Telnet messages.
➤ Updated the profile and compressed profile commands (PRO and
CPRO, respectively) to display the available analog signal profiling
records regardless of the state of the signal profile enable (SPEN) set-
ting.
➤ Changed the result of a SELOGIC control equation math error from NAN
(not a number) to the previously stored valid result.
➤ Improved Port 5 functionality to disable auto-messages when the auto-
messages setting is equal to no (AUTO=N).
➤ Changed the IEC 61850 Configured IED Description (CID) file to sup-
port non-Relay Word bit binary elements included in a GOOSE mes-
sage.
➤ Improved dual breaker applications by allowing different CT ratios for
all functions.
➤ Modified the relay to continue to send synchrophasors data after a
change in port settings.
➤ Changed the Global Setting Message Format (MFRMT) so that when it
is set to Fast Message (FM), the freeform settings PMAQ, PMAA,
PMDG, and PMDA are hidden.
➤ Changed the Station ID label in the COMTRADE configuration (.cfg)
file to prevent non-alphanumeric characters per the IEEE C37.111-1999
COMTRADE standard.
➤ Modified the firmware to prevent IP traffic from becoming unresponsive
when the Parallel Redundancy Protocol (PRP) is enabled.
➤ Clarified the message generated by the relay in response to an invalid
CID file.
➤ Added local time and date analog quantities.
➤ Improved relay performance during certain incorrect memory reads.
Table A.1 Firmware Revision History (Sheet 4 of 7)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
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