ABB Industrial IT enabled REX 521 Technical Reference Manual, General page 5

Protection relay

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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.

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