ABB RELION REX640 Technical Manual page 228

Section 3
Basic functions
222
BLOCK
Date
comparator
FREEZE
GUID-70EB7E59-AB19-4E01-A300-E3DC2440603E V1 EN
Figure 109: Functional module diagram
Date comparator
This module compares the current date (excluding the calendar year) with the set
activation and deactivation date and month settings. If the system date and month are
the same or greater than Activation day and Activation month settings, output Q is
activated and remains active till the date reaches the set Deactivation day and
Deactivation month settings.
Activation of the BLOCK input deactivates the function output whereas the activation
of the FREEZE input freezes the output. The BLOCK input always has a higher priority
than the FREEZE input.
The module automatically handles the leap day and different month lengths.
• The function output remains active during the leap day if the leap day falls within
the set activation period.
• If the set Activation day is not a valid date (for example, 31st April), then the
output does not activate.
• If the set Deactivation day is not a valid date (for example, 31st April), then the
last date of the month is considered.
Q
5/12 7/12
Q
20/12 22/12
GUID-AB1D74E4-219E-45C9-B449-20D6BDFFF96E V1 EN
Figure 110: Examples of how output Q is activated for different settings
Q
10/12 15/12
Set Activation day = 07, Activation month = December
Set Deactivation day = 22, Deactivation month = December
25/12
31/12
Set Activation day = 22, Activation month = December
Set Deactivation day = 07, Deactivation month = January
1MRS759142 C
20/12 22/12 25/12
5/1 7/1 10/1
Technical Manual
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REX640