System 450™ Series Modular Control Systems with Standard Control Modules Technical Bulletin
21
In addition to a proportional-only setting, System 450 provides six time-integral settings in the Integration
Constant Setup screen for matching the analog signal’s response rate to the controlled system’s recovery rate.
The seven integration constant settings are shown in Table 9 on page 54.
See Determining the Integration Constant for an Analog Output
on page 51 for more information and the
procedures for determining an integration constant and testing a PI control loop in your controlled system.
The Analog Output Update Rate and Output Deadband contain two parameters that can be used to minimize the
frequency of changes to the output signal from the control. When controlling a device such as an actuator, these
features can lengthen the actuator life by reducing the actuator position update frequency. See Analog Output
Update Limiters and Analog Output Deadband for more information.
Analog Output Update Limiters
The Output Update Rate and Output Deadband are used to minimize the frequency of changes to the output signal
from the control. When controlling a device such as an actuator, these features can lengthen actuator life by
reducing the actuator position update frequency.
Analog Output Update Rate
The Output Update Rate feature allows you to select the rate, in seconds, during which the control does not allow
an update to the analog output’s signal strength. The Output Update Rate value range is 1 to 240 (seconds) and
the default value is 1 (second).
The Output Update Rate and Output Deadband are used to minimize the frequency of changes to the output signal
from the control. When controlling a device such as an actuator, these features can lengthen actuator life by
reducing the actuator position update frequency.
The System 450 control module calculates the input-induced output signal strength once per second. The default
Output Update Rate is one second. The actual output signal strength is updated to the calculated output signal
strength once every second when the control is set to the default update value. In some control applications, a
1-second update rate may be too frequent and may result in premature wear on the controlled equipment, such as
actuators.
When you select an Output Update Rate value greater than 1 second, the control module delays updating the
output and maintains the output signal strength for the duration of the selected update rate. At the end of the
selected update rate, the control updates the output signal strength to the current calculated output signal strength
and maintains the new output signal strength value for the selected output update rate value.
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