5 math a – Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller FLEXIBLE CONTROL STRATEGIES User Manual
Page 21
2.7.5 MATH A
The Math A module executes a selected function on three input variables A, B, and C. The func-
tion to be executed by Math A is selected by entering a Function Code (FC) in datapoint B126. Nu-
meric values for parameter constants K1, K2, and K3 can also be entered into their respective
datapoints, which may affect the output as determined by the function code selected. The output
can be a numeric (C030) and/or a logic (L098) value.
The tables that follow list the input variables, parameters, and function codes. An illustration of the
Math A module follows the tables.
Inputs
Parameters
WIRELIST
SYMBOL
DATA
TYPE
ASSIGNED VALUE
SYMBOL
DATAPOINT
ASSIGNED VALUE
B123
A
C
K1
C076
B124
B
C
K2
C077
B125
C
C
K3
C078
B126
FC
N/A
Output Datapoints: C030, L098
Math Functions
FC
C OUTPUT
L OUTPUT
FC
C OUTPUT
L OUTPUT
0
A
No change
10
K1
×
2
([K2
×
A] + K3)
No change
1
(K1
×
A) + K2
No change
11
K1
×
log([K2
×
A] + K3)
No change
2
(K1
×
A) + (K2
×
B) + (K3
×
C)
No change
20
Limit to constant
(K1 < A < K2)
1 if A
≥
K2 or K1
≥
A
3
(K1
×
A
×
B
×
C) + K2
No change
0 otherwise
4
(K1
×
[A
/
B]) + (K2
×
C)
No change
21
Limit to variable
(K1
×
C < A < K2
×
B)
1 if A
≥
K2
×
B or K1
×
C
≥
A
5
([K1
×
A] + [K2
×
B]
/
C) + K3
No change
0 otherwise
6
([K1
×
A
×
B]
/
C) + K2
No change
22
Compare to constant
1 if A
≥
K1
7
([K1 + A]
/
[K2 + B])
×
K3
No change
0 if A < (K1 - K2)
8
(K1
×
abs[A]) + K2
No change
23
Compare to variable
1 if A
≥
(K1
×
B) + K2
9
K1
×
A
([K2
×
B] + K3)
No change
0 if A < (K1
×
B) + K2 - K3
FC + 128 yields square root of C output
FCS 53MC5000 Flexible Control Strategies
2-14
MATH-A