Spp Function Block - Honeywell HC900 Reference Manual

SPP Function Block

Description
The SPP label stands for Setpoint Programmer .
This block is part of the Setpoint Program category.
Function
Runs a ramp/soak program that produces a setpoint output on a time-based profile that is loaded
setpoint
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
3 51) .]
output (page
H
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
setpoint programmer and guaranteed soak (page
Up to 3 Process Variables may be configured as inputs to the block for setpoint guarantee.
Input
= Process Variable #1 value in engineering units, for deviation check.
PV1
= Process Variable #2 value in engineering units, for deviation check.
PV2
Revision 11
2/07
HC900 Hybrid Control Designer Function Block Reference Guide
E xample 4 - Using the setpoint programmer AUX
H
3 48) .]
H
Function Blocks
SPP Function Block
E xample 1 - PID with
H
343