103
APPENDIX A – CONTROL TEMPLATES
WV
x
rAtO
+
bIAS
I/P3
L
LR
I/P1
Manual Output
OP1
Local Ratio
Remote Ratio
Process V
ariable input
PV –
bIAS
WV
I/P2
Wild V
ariable
PV
WV
rAtO
Actual
Ratio
*
T
e
mplate 17 Only
*
The
Ratio Station
provides a set point for a subsequent slave controller. The wild variable is weighted by ratio (rAtO) and bias (bIAS) values a
nd
is then retransmitted as an analog output value. The ratio value applied to the wild variable can be either a local value set o
n the front panel or a remote
signal on an analog input.
The actual ratio of the process variable to the wild variable is also displayed.
A8
Ratio Station (Templates 16 and 17)