Function Blocks
SPP Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 343
2/07
SPP Function Block
Description
The SPP label stands for Setpoint Programmer.
This block is part of the
Setpoint Program category.
Function
Runs a setpoint ramp/soak program that produces a setpoint output on a time-based profile that is loaded
into the block. Up to 4 SPP blocks may be included in a system configuration. A single profile may be from
2 to 50 segments in length. Up to 70 profiles are stored in the controller’s memory.
Each segment of the
profile may be a ramp or soak except the last segment must be a soak.
In addition to the main ramp and soak output value, a second (AUX) analog value is available for each step
of the program. This output is a fixed soak value that may be used to provide a setpoint value for a
secondary control loop in the process. [For example, see
HExample 4 - Using the setpoint programmer AUX
output (page
H351).]
A Setpoint guarantee function is provided that holds the program if a process variable exceeds a predefined
deviation from setpoint. Selections allow setpoint guarantee to be active for the entire program, for soak
segments only, or for user specified segments, or for no segments. [For example, see
HExample 1 - PID with
setpoint programmer and guaranteed soak (page
H348).]
Up to 3 Process Variables may be configured as inputs to the block for setpoint guarantee.
Input
PV1
= Process Variable #1 value in engineering units, for deviation check.
PV2 = Process Variable #2 value in engineering units, for deviation check.
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