Honeywell HC900 - Figure 76 Cascade Control of a Boiler Drum Level - 3 Element Feedwater Control

Function Blocks
PID Function Block
292 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Example 6 - Cascade control of a boiler drum level - 3 element feedwater control
M
Feedwater Flow
FT 2
Steam
Note: All physical
connections are by
I/O cards
LT 2
LT 1
Steam Drum
Figure 76 Cascade control of a boiler drum level - 3 element feedwater control