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4/00 UDC 3300 Controller Product Manual 173
Functional overview
Figure 5-2 is a block diagram of a Loop 1 of a single loop controller and
Loop 1 and Loop 2 of a dual loop controller.
Figure 5-2 Functional Overview Block Diagram of a Single Loop (Loop #1) or Dual Loop
Controller (Loop #1 and Loop #2)
24180
IN 1
Ratio
Bias
•
••
IN 2
Ratio
Bias
•
••
12
PV
Source
IN 2
In Alg2
RSP
Source
Input 1
Input 2
Output 1
Output 2
INPUT A
INPUT B
INPUT C
INPUT
ALGORITHM 1 or 2
FEEDFORWARD
INPUT A ONLY
To RSP
SP
Source
SP
PV
Remote SP
Local SP
SP
2SP
3SP
To RSP
•
To RSP
PID
CONTROL
ALGORITHM
Loop 1 or Loop 2
FEEDFORWARD
SUMMER OR
MULTIPLIER
OUTPUT
Output
without
Feedforward
or Manual
Mode
To Final
Control
Element
None
OUT 2
In Alg1
IN 3
Ratio
Bias
•
••
3
•
To RSP
IN 3
Input 1
Input 2
In Alg 1
In Alg 2
Output 2
Output 1
Input 3
Input 1
Input 2
In Alg 1
In Alg 2
Output 2
Output 1
Input 3
Input 3