Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 114)

Control Primer
7-12
Interactive and Non-interactive Control
Interactive control action is when action of one function influences the action of other functions
within the controller. Non-interactive control is when functions are independent.
Interactive action is illustrated in Figure 7-9. In this illustration, tank B is being drained and this, in
turn, influences the level in tank A. Non-interactive action is illustrated in Figure 7-10. In this
illustration, tank B is being drained and tank A is being drained into tank B. Changing the drain rate
in tank B in this case does not influence the level of tank A.
Proportional-Plus-
Integral-Plus-
Derivative (PID)
Control Action
Interactive
Control Action
Figure 7-8
Figure 7-9