ABB CM30 - Ratio Station (Internal; External Ratio)

ControlMaster CM30 and CM50
Universal process controllers,
1
/4 and
1
/2 DIN 8 Templates and Functionality
70 IM/CM/ED–EN Rev. B
8.3.5 Ratio Station (Internal / External Ratio)
The ratio station template configures the ControlMaster as an Indicator and setpoint generator. The
unregulated 'wild' variable is weighted with ratio and bias values and is then retransmitted to a slave
controller.
AIN 1
AIN 2
AIN 3
Local
Ratio
PV – Bias
WV
WV
WV x Ratio
+ Bias
PID
O/P
Manual
Output
A/M
OP
Analog
Output
Output Type
AO1
PV
Actual Ratio