ABB REL 501-C1 2.5, Technical Reference Manual

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4
Introduction to the technical reference manual Chapter 1
Introduction
Figure 2: Simplified logic diagram example
The names of the configurable logic signals consist of two parts divided by dashes. The first part
consists of up to four letters and presents the abbreviated name for the corresponding function.
The second part presents the functionality of the particular signal. According to this explanation,
the meaning of the signal TUV--BLKTR is as follows.
• The first part of the signal, TUV- represents the adherence to the Time delayed
Under-Voltage function.
• The second part of the signal name, BLKTR informs the user that the signal will
BLocK the TRip from the under-voltage function, when its value is a logical one
(1).
Different binary signals have special symbols with the following significance:
• Signals drawn to the box frame to the left present functional input signals. It is
possible to configure them to functional output signals of other functions as well
as to binary input terminals of the REx 5xx terminal. Examples are TUV--BLK-
TR, TUV--BLOCK and TUV--VTSU. Signals in frames with a shaded area on
their right side present the logical setting signals. Their values are high (1) only
when the corresponding setting parameter is set to the symbolic value specified
within the frame. Example is the signal Operation = On. These signals are not
configurable. Their logical values correspond automatically to the selected set-
ting value.The internal signals are usually dedicated to a certain function. They
are normally not available for configuration purposes. Examples are signals
STUL1, STUL2 and STUL3.The functional output signals, drawn to the box
frame to the right, present the logical outputs of functions and are available for
TUV--BLKTR
TUV--BLOCK
TUV--VTSU
>1
STUL1
STUL2
&
&
&
STUL3
Operation = On
>1
&
t
t
t
15 ms
TUV--TRIP
TUV--START
TUV--STL1
TUV--STL2
TUV--STL3
t
15 ms
t
15 ms
t
15 ms
t
15 ms
TRIP - cont.
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