Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
7-49
If the instrument connected to the AI block fails, you can place the AI block in
Manual
mode and set the output to some nominal value for use in the
Integrator function block. In this case, IN at the slave PID block is constant
and prevents the integral term from increasing or decreasing.
Figure 7-21. Function Block Diagram for Cascade Control with Override
BKCAL_IN
BKCAL_OUT
Slave Controller
Master Controller
CAS_IN
PID
Function
Block
OUT
PID
Function
Block
IN
OUT
CAS_IN
AO
Function
Block
BKCAL_SEL_1
Configured for High Selection
SEL_1
SEL_2
Control
Selector
Function
Block
IN_1
OUT
PID
Function
Block
BKCAL_SEL_2
Master Controller
PID
Function
Block
OUT
AI
Function
Block
OUT
3
8
7
4
0
1
0
1
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