Cascade control (fixed-point control) – Yokogawa Data Acquisition with PID Control CX2000 User Manual
Page 411
App-42
IM 04L31A01-01E
Cascade Control (Fixed-Point Control)
Primary loop
PV input
Secondary loop
PV input
Contact input
Remote
input
Control computation section 1
SP ramp-rate setting
Secondary loop
SP 1 to 8
Primary loop
SP 1 to 8
Control computation section 2
Manual operation
Preset output
Current or
pulse
Relay
Run
Auto, cascade
Auto, manual
MAN
AUT
Local
Remote
Manual
Stop
Stop/Run switching
Manual/Auto, cascade switching
Cascade switching
Cascade
Cascade
Tracking signal
Output limiter
Alarm function
Control output
Remote/Local switching
DI
DI
DI
DI
DI
DO
DO
DO
DO
DO
DO
Input type selection
Unit selection
Analog input range conversion
Square root computation
Ten-segment linearizer approximation/
ten-segment linearizer bias
PV input bias
PV input filter
Input type selection
Unit selection
Analog input range conversion
Square root computation
Ten-segment linearizer approximation/
ten-segment linearizer bias
PV input bias
PV input filter
Input type selection
Unit selection
Analog input range conversion
Square root computation
Alarm1 Alarm2 Alarm3 Alarm4 Alarm1 Alarm2
Note: There are 6 contact input terminals and
6 contact output terminals on a single
control output terminal block.
The functions that can be assigned to
each input/output terminal vary depending
on the control mode and whether program
operation is enabled.
Remote input filter
Ratio bias computation
Appendix 7 Control Functon Blodk Diagram