7. In the Integration Constant Selection screen,
press Up or Down to select the output’s Integration
Constant for proportional plus integral control.
An integration constant allows you to set up
proportional plus integral control for this analog
output. proportional plus integral control can drive
the load closer to Setpoint than proportional only
control. Press Next to save your selection and go to
the Output Update Rate Selection screen.
Note: Initially, you should select the I-C value
of 0 (zero) for no integration constant. Refer
to the System 450 Series Technical Bulletin
(LIT-12011459) for more information on
proportional plus integral control and setting
an integration constant in the System 450 UI.
The following figure shows an I-C value of 0
(zero) selected for Output 3.
Figure 38: Integration Constant Selection screen
8. In the Output Signal Update Rate Selection screen,
press Up or Down to select the output’s Output
Signal Update Rate. Select the time interval in
seconds at which the output updates the output
signal strength. The selected Output Signal Update
Rate is the minimum time that the output maintains
a constant signal strength (regardless of the input
signal) before updating the output signal in response
to the referenced input signal. The Output Signal
Update Rate value range is 1 to 240 (seconds). Press
Next to save your selection and go to the Output
Signal Dead Band Selection screen.
Note: The Output Update Rate is used to
reduce excessive cycling or repositioning
of controlled equipment, such as valve and
damper actuators. The Output Signal Update
Rate feature can be used in conjunction with
the Output Signal Dead Band feature.
The following figure shows an Output Update
Rate value of 1 (second), which is the default
and lowest update rate you can select.
Figure 39: Output Signal Update Rate Selection screen
9. In the Output Signal Dead Band Selection screen,
press Up or Down to select the output’s Output
Signal Dead Band. Select the Output Signal Dead
Band value (as a percent of the output signal
strength range) to establish a dead band around the
analog output signal strength. The analog output
responds to a changing input signal and updates
the output signal strength whenever the input
signal moves outside of the selected Output Signal
Deadband. Press Next to save your selection and go
to the Sensor Failure Mode Selection screen.
At each update of the output signal, the con-
trol determines if the calculated (input-induced)
output signal strength is within the selected
Output Signal Dead Band or not. If the input-
induced change of the output signal strength
is within the selected Output Signal Dead Band,
the output signal strength is not updated
and remains unchanged. If the input-induced
change of the output signal falls outside the
Output Signal Dead Band, the output signal
strength is updated to the new signal strength
value and the selected Output Signal Dead Band
is applied to the new signal strength value. The
Output Signal Dead Band range is 0 to 50% of
the OSP to OEP range.
Note: The Output Signal Dead Band is used
to reduce excessive cycling or repositioning
of controlled equipment, such as valve and
damper actuators. The Output Signal Dead
Band feature can be used in conjunction with
the Output Signal Update Rate feature.
The following figure shows an Output Dead
Band value of 0 (%), which is the default value
and disables the Output Dead Band feature.
Figure 40: Output Signal Dead Band Selection screen
10. In the Sensor Failure Mode Selection screen, press
Up or Down to select the output’s mode of operation
if the sensor or sensor wiring fails. For outputs that
reference functional sensors HI-2, HI-3, or Sn-d, the
failure of any of the referenced hard-wired sensors
results in a functional sensor failure condition. The
output operates in the selected Sensor Failure mode
until the failure is remedied. Sensor Failure mode
selections for analog outputs include:
- ON—output generates the selected OEP
signal strength during sensor failure.
- OFF—output generates the selected OSP
signal strength during sensor failure.
Press Next to save your selection and go to the
Edit Sensor Selection screen.
The following figure shows OFF selected as the
Sensor Failure mode for Output 3.
Figure 41: Sensor Failure Mode Selection screen
11. If you do not need to change the output’s sensor,
simply press Next in the Edit Sensor Selection
screen to save the current sensor selection and
return to the Analog Output Setup Start screen.
System 450 Series Control Module with Ethernet Communications Installation Guide18
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