Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller FLEXIBLE CONTROL STRATEGIES - Manual (Page 48)

2.7.29 MATH F
The Math F module executes a selected function on three input variables A, B, and C. The func-
tion to be executed by Math F is selected by entering a Function Code (FC) in datapoint B208. 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 (C036) and/or a logic (L087) value.
The tables that follow list the input variables, parameters, and function codes. An illustration of the
Math F module follows the tables.
Inputs Parameters
WIRELIST SYMBOL DATA
TYPE
ASSIGNED VALUE SYMBOL DATAPOINT ASSIGNED VALUE
B205 A C K1 C091
B206 B C K2 C092
B207 C C K3 C093
B208 FC N/A Output Datapoints: C036, L087
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
Section 2. FCS Modules
MATH-F
2-41