ABB Industrial IT enabled REX 521 - Revision history of REX 521; Revision identification; Changes and additions to earlier released revision B

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Technical Reference Manual, General
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49
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The main releases of REX 521 products are differentiated with the revision and
configuration revision letters in the order number (refer to “Ordering information”
on page 48).
The revision and configuration revision letters determine the main release which
may involve functional additions and changes to the product. Revision letter
indicates changes in relay hardware and configuration revision letter in software.
The changes included in each release compared to the previous one are described in
more detail below.
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• New communication protocol Modbus
• Additional HMI language Polish
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• Function block additions to the following configurations
• H01: PQ 3Unf
• H02: Io>>>-->, f1
• H04: 3I>-->, f1
• High configuration: H07
• Earth fault protection based on calculated I
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(High configurations H01-H05 only)
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• Improved CPU module
• Alarm LEDs
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REX 521 A B Q3/2001
B C Q3/2002
C D Q4/2003