ABB Industrial IT enabled REX 521 Technical Reference Manual, General page 49

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Technical Reference Manual, General
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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).
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REX 521 A
B
C
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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• Improved CPU module
• Alarm LEDs
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B
C
D
(High configurations H01-H05 only)
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Q3/2001
Q3/2002
Q4/2003
49