System 450™ Series Modular Control Systems with Standard Control Modules Technical Bulletin
48
The Output at Setpoint (OSP) and Output at End Point (OEP) parameters allow you to select the output signal
strength (as a percentage of the total signal strength range) that an analog output sends to the controlled
equipment at Setpoint and End Point.
The relationship between these four setup values (SP, EP, OSP, and OEP) determines the analog output’s
proportional control action, which is indicated on the control module LCD by the control ramp indicator. See
Figure 1 on page 5 and Direct and Reverse Control Actions for Analog Outputs
on page 18 for more information on
the control ramp indicator.
Note: System 450 analog outputs that reference the differential control sensor (Sn-d) use a Differential Setpoint
(dSP) and Differential End Point (dEP) to define the output’s proportional band. See Differential Control
on
page 24 for more information.
The Integration Constant (I-C) parameter allows you to select an integration constant for the analog signal.
Selecting an integration constant other than 0 enables proportional plus integral control action, which in many
applications can drive the condition closer to setpoint (than proportional-only control action). See Proportional Plus
Integral Control and Integration Constants on page 20 for more information. See Determining the Integration
Constant for an Analog Output on page 51 for procedures on determining and testing the integration constants in
your control application.
Figure 27: Relationship between Setpoint, End Point, Output at Setpoint, and
Output at End Point for an Analog Output That Controls Room Heating
Figure 28: Relationship between Setpoint, End Point, Output at Setpoint, and Output at
End Point for an Analog Output That Controls Condenser Fan Speed
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