ABB Industrial IT enabled REX 521 - Page 5

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Technical Reference Manual, General
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Version D/24.11.2003
-Changes and/or new entries in tables “Hardware versions of REX 521“, “Power outputs“, “Data
communication”, “Display language codes”, and “Class 1 data signals”.
-Changes in chapters “Introduction”, “External parametrization”, “Scaling of the rated values of the
protected unit for analogue channels”, “Technical data of the measuring devices”, “Trip-circuit
supervision”, “Serial communication”, “Ordering information”, “Revision identification”, “Changes
and additions to earlier released revision”, “Configuration, setting, and SA system tools”, References”,
“Class 2 data”, “Appendix B: Parameters visible only in the relay”, and “Appendix C: Parameters
which cause reset“.
-New chapters: “Graphical I/O Setting Tool“, “Factory settings“, “Modbus bus“, “Isolated RS-485
connection on the rear panel“, and “Alarm LEDs”.
-Changes in figures “REX 521 protection relay”, ”Block_Basic”, “Block_Medium”, “Block_High”,
“Highsensor”, “RearViewBasic”, “RearViewMedium”, “RearViewHigh”, “RearViewSensor”, and
“OrderNo”.
-New figures: “Modbus_syst”.
-TCS changed to TCS1.
-3I MCS changed to MCS 3I.
-3U MCS changed to MCS 3U.