Note: The unit of measurement, resolution
increment, minimum proportional band, and
range of usable values for dSP and dEP are
determined by the Sensor Type selected for
Sn-1 and Sn-2. (See Table 3 and Table 5 for
more information.) The output’s minimum
proportional band (between dSP and dEP) is
automatically enforced in the output’s Setpoint
and End Point Selection screens.
The following figure shows a dSP value of 30
(psi) selected for Output 3.
Figure 33: Differential Setpoint Selection screen
4. When the output references Sn-1, Sn-2, Sn-3,
HI-2, or HI-3, press Up or Down in the End Point
Selection screen to select the output’s End Point
value. End Point is the value that the controlled
system drives away from (towards Setpoint)
and, along with Setpoint, defines this output’s
proportional band. Press Next to save your End
Point value selection and go to the %Output Signal
Strength at Setpoint Selection screen.
Note: An output’s minimum proportional
band (between Setpoint and End Point) is
automatically enforced in the output’s Setpoint
and End Point Selection screens.
The following figure shows an End Point value
of 250 (psi) selected for Output 3.
Figure 34: End Point Selection screen
When the Output references Sn-d, press Up or
Down in the Differential End Point Selection
screen to select the output’s Differential End
Point value. Differential End Point (dEP) is the
target value that the controlled system drives
away from (towards Differential Setpoint)
and along with Differential Setpoint (dSP),
defines this output’s proportional band. The
dEP value is a differential value that represents
a (selected) difference in the condition
(temperature, pressure, or humidity) between
Sn-1 and Sn-2 (Sn-1 minus Sn-2). Depending on
the intended proportional control action and
the physical location of Sn-1 and Sn-2 sensors
in the condition process, dEP may be a positive
or negative value. Press Next to save your
Differential End Point value selection and go
to the %Output Signal Strength at Setpoint
Selection screen.
Note: The unit of measurement, resolution
increment, minimum proportional band, and
range of usable values for dSP and dEP are
determined by the Sensor Type selected for
Sn-1 and Sn-2. (See Table 3 and Table 5 for
more information.) The output’s minimum
proportional band (between dSP and dEP) is
automatically enforced in the output’s Setpoint
and End Point Selection screens.
The following figure shows a dEP value of 25
(psi) selected for Output 3.
Figure 35: Differential End Point Selection screen
5. In the Output Signal Strength at Setpoint
Selection screen, press Up or Down to select the
output’s %Output Signal Strength at Setpoint (OSP)
value. Select the strength of the signal that the
output generates when the sensed condition is at
the Setpoint value. The signal strength range is 0 to
100 (%). Press Next to save your selection and go to
the %Output Signal Strength at End Point Selection
screen.
The following figure shows an OSP value of 10
(%) selected for Output 3. Therefore Output 3
generates 10% of the total signal strength (1
V or 5.6 mA) when the input is at the Setpoint
value of 200 (psi).
Figure 36: Output Signal Strength at Setpoint Selection
screen
6. In the Output Signal Strength at End Point
Selection screen, press Up or Down to select the
output’s %Output Signal Strength at End Point value.
Select the strength of the signal that this output
generates when the sensed condition is at the End
Point value. The signal strength range is 0 to 100
(%). Press Next to save your selection and go to the
Integration Constant Selection screen.
The following figure shows an OEP value of 90
(%) selected for Output 3. Therefore Output 3
generates 90% of the total signal strength (9 V
or 18.4 mA) when the input is at the End Point
value of 250 (psi).
Figure 37: Output Signal Strength at End Point Selection
screen
System 450 Series Control Module with Ethernet Communications Installation Guide 17
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