Figure 4-3 Functional Overview Block Diagram Of A Single Loop (Loop #1) Or Dual Loop Controller (Loop #1 And Loop #2) - Honeywell UDC3500 Product Manual

To RS P
IN 1 IN 2 IN 3 IN 4 IN 5
RS P
S o urc e
Re mo te S P
Lo c al S P
S P 4
S P 1
S P 2 S P 3
Fe e dfo rward o r
Manual Mo de
Figure 4-3 Functional Overview Block Diagram of a Single Loop (Loop #1) or Dual
Internal Cascade Control
See Functional Overview Block Diagram Figure 4-3 for selections based on these
diagrams.
The following rules apply for internal Cascade control:
•
Loop 2 is the primary (external) loop.
•
Loop 1 is the secondary (internal or slave) loop.
•
Loop 1 Remote Setpoint is fixed as the Loop 2 output.
3/07
In Alg 1 In Alg 2
PV
S o urc e
OUT 2
To RS P
PV
PID
S P
S P
CONTROL
S o urc e
ALGORITHM
Lo o p 2
Output
witho ut
OUTPUT
Loop Controller (Loop #1 and Loop #2)
UDC3500 Universal Digital Controller Product Manual
Monitoring and Operating the Controller
IN 1 IN 2 IN 3
Ra tio Ra tio Ra tio
Bia s Bia s Bia s
• •
• • • • •
1 2
•
To RS P To RS P
INPUT
ALGORITHM 1/2
FEEDFORWARD
INPUT A ONLY
FEEDFORWARD
S UMMER OR
MULTIPLIER
To Final
Co ntro l
Ele me nt
IN 4 IN 5
Ra tio Ra tio
Bia s Bia s
• • •
• • • •
3 4
• • •
To RS P To RS P
1
2
3
INPUT A
Othe r
Alg
Output 1
Output 2
1
2
3
4
INPUT B
5
Othe r
Alg
Output 1
Output 2
1
2
INPUT C
4
5
Othe r
Alg
No ne
•
5
4
5
3
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