Omron SYSMAC CS Series Operation Manual page 47

Outline
Temperature Control of Kettle Reboiler (Cascade Control)
Analog Input Analog
Unit Output Unit
Temperature
Cold water
Drain
Boiler Drum Level Control (with Cascade Feedforward Control Function)
Analog
Input Unit
Steam flowrate
Level
Loop Controller
PID1
PV 1
MV 1
RSP1
PID2
PV 2
MV 2
Liquid-vapor
separation
converter
Temperature
Temperature
Conversion
Loop Controller
Analog
Output Unit
PV 1 PID1
MV 1
+
RSP
PV 2
PID2
MV 2
Steam
MV2
Flowrate
Water supply
Section 1-1
CPU Unit
Vapor
CPU Unit
15