32
50.0
55.0
70
Actual –
Desired
Ratio
Deviation
OP1
0.0
bIAS
70
OP1
•1
Actual –
Desired
Ratio
Deviation
…2 OPERATOR LEVEL
2.10 Ratio Station (Templates 16 and 17)
The ratio station provides a set point for a subsequent slave controller. The wild variable (WV) is
weighted by ratio (rAtO) and bias (bIAS) values and is then retransmitted as an analog output value.
•1 Displayed only if enabled in Level B, Operator Configuration – see Section 5.7.
Actual Ratio
=
Process Variable (PV) – Bias
Wild Variable (WV)
Desired Ratio
Adjustable in local control only.
Ratio Setpoint Output
= (WV x Ratio) + Bias
[–10 to 110%]
Adjustable in manual control only.
Bias
[In engineering units]
Continued…
WV x
rAtO
+
bIAS
I/P3
Manual Output
OP1
I/P2
WV
rAtO
L
LR
Local Ratio
•1 Template 17 only
Remote Ratio
Wild Variable
•1
Analog
Output
Profile Set Point
Fig. 2.9 Ratio Station
To Next Page
Loading...
