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States of limit values are the most important input quantities of the logic module. If more than 3 inputs are
required, the result of a logic function can be used as input for the next function. For that you have to know that
logic functions are evaluated in the sequence 1…32. Thus it’s meaningful to use the result of a logic function c
in a logic function x+n to assure that further processing is performed in the current evaluation cycle, rather than
in the next cycle.
For completeness the truth tables of the usable logical functions are shown below. For simplicity their
functionality has been reduced to gates with two inputs only.
function
symbol
older symbols
truth table
plain text
ANSI 91-1984
DIN 40700 (alt)
AND
A
B
Y
0
0
0
0
1
0
1
0
0
1
1
1
Function is true if all input
conditions are fulfilled
NAND
A
B
Y
0
0
1
0
1
1
1
0
1
1
1
0
Function is true if at least
one of the input
conditions is
not
fulfilled
OR
A
B
Y
0
0
0
0
1
1
1
0
1
1
1
1
Function is true if at least
one of the input
conditions is fulfilled
NOR
A
B
Y
0
0
1
0
1
0
1
0
0
1
1
0
Function is true if
none
of
the input conditions is
fulfilled
XOR
A
B
Y
0
0
0
0
1
1
1
0
1
1
1
0
Function is true if exactly
one of the input
conditions is fulfilled
XNOR
A
B
Y
0
0
1
0
1
0
1
0
0
1
1
1
Function is true if all of
the input conditions are
fulfilled or all conditions
are not fulfilled
4.3.4 Defining measurement data to record
After the definition of event controlled recording data measurements may be selected, which shall be recorded
in periodical intervals over a longer time period. In the final step you select how much of the available memory
will be reserved for each logger / list type.
In the register „
Logger of the meters
“ you can select which of the available meters shall be read and recorded
in regular intervals. In the following example the meters for incoming active and reactive energy are selected, to
be read every day at 00:00.
