Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller FLEXIBLE CONTROL STRATEGIES - Manual (Page 39)

2.7.21 MATH D
The Math D module executes a selected function on three input variables A, B, and C. The func-
tion to be executed by Math D is selected by entering a Function Code (FC) in datapoint B180. 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 (C034) and/or a logic (L091) value.
The tables that follow list the input variables, parameters, and function codes. An illustration of the
Math D module follows the tables.
Inputs Parameters
WIRELIST SYMBOL DATA
TYPE
ASSIGNED VALUE SYMBOL DATAPOINT ASSIGNED VALUE
B177 A C K1 C085
B178 B C K2 C086
B179 C C K3 C087
B180 FC N/A Output Datapoints: C034, L091
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
2-32
MATH-D