Appendix B - Table of Functions of Universal Blocks
Appendix B - Table of Functions of Universal Blocks
Each Universal Block has 3 inputs which have been marked out A, B and C. These inputs can be pointers or
parameters. In the table below following convention of type denoting is used: A (big letter A) means that input
A
is
parameter (value is assigned directly to it), but
a
(the small letter a) means that the input
a
is a pointer (it points PCH
which contains input value). Inputs B and C are marked in the same way.
Caution: In OUT which is interpreted as logic value (0/1 or not/yes) abbreviation
H
is used for definition of any
value different from zero (logic 1). For definition of «logic 0» value character
L
is used.
Function
number
Output
(OUT of the block)
Description
0
a
Output OUT assumes a value which is defined by an input
a
. It serves for storing values
which are quickly changed – for 10 ms after execution of this block, value of output PCH
will not change even if input value changes.
1
a + b + c
Value OUT of the unit is the sum of three pointers
a, b
and
c
2
a * b / c
Product
a * b
divided by value c
3
(a + b)
OUT of the unit =
- (a + b)
(negation the sum)
4
ABS (a + b)
OUT of the unit = an absolute value of
(a + b)
5
a + b - c
OUT of the unit =
a + b - c
6
b ≤ a ≤ c
Limitation of an output range. Output signal of the unit is between b (minimum) and c
(maximum) according to rules described below:
If
(a < b)
→ OUT =
b
If
(a ≥ b)
or
(a ≤ c)
→ OUT =
a
If (
a > c
) → OUT =
c
7
B ≤ a ≤ C
The same as item 6 but B and C are constant parameters
8
a + B
OUT =
a + B
,
B
is a parameter (e.g. addition of a constant offset)
9
If c = H, OUT = b
If c = L, OUT = a
The multiplexer 1 from 2. Logic state of an input decides about output value
a
or
b
.
B
C
OUT
A
10
If (a ≥ B), OUT = a
If (a <B), OUT = c
If value of an input
a
is equal or higher than a threshold determined by input
B
an output
value
a
will be assumed. If value of an input
a
is less than threshold determined by input
B
an output value
c
will be assumed.
11
a ≥ (b * C)
OUT = H when the inequality is carried out, OUT = L in all other cases
12
a ≥ (b + C)
OUT = H when the inequality is carried out, OUT = L in all other cases
13
a = (b+/-C)
OUT = H when value is in the limits
<b-C... b+C>
,
OUT = L in all other cases
14
If (a <b - C), OUT = L
If (a> b + C), OUT = H
A hysteresis. The output signal doesn't change for
a
which is in limits
<b-C... b+C>
15
B + a * (C - B) / 1000
Graduation. The input value
a
will be transformed from a range 0...1000 (0.0...100.0 %) to
a range determined by parameters
B
and
C
.
16
(a - B)*1000 / (C - B)
Graduation. The input value
a
will be transformed from a range determined by
parameters
B
and
C
to a range 0...1000 (0.0...100.0 %
Frequency converter MFC710 type with OP-11 control panel. TWERD Power Electronics
73
L1
0
b+C
b-C
b
C
C
a
PCH
1000
0
C
B
PCH
a
1000
0
C
B
PCH
a
