User Guide
Table Of Contents
- Table of Contents
- How to Use This Manual
- Chapter 1–Program Methodology
- Overview
- Introduction to PPCL
- PPCL Rules
- PPCL Program Design Guidelines
- Relational Operators
- Logical Operators
- Arithmetic Operators
- Arithmetic Functions
- Special Functions
- Order of Precedence
- Resident Points
- Local Variables
- Point Priority Overview
- At (@) Priority Status Indicators
- Point Status Indicators
- Converting a Sequence of Operation intoProgram Code
- Chapter 2–Control OptionComparisons
- Chapter 3–Command Syntax
- Overview
- ACT (Activate lines)
- ADAPTM (Adaptive control, multiple)
- ADAPTS (Adaptive control, single)
- ALARM (Alarm state)
- AUTO (Auto status)
- DAY (Day mode)
- DBSWIT (Dead band switch)
- DC (Duty cycle)
- DCR (Duty cycle routine)
- DEACT (Deactivate lines)
- DEFINE (Define abbreviation)
- DISABL (Disable lines)
- DISALM (Disable alarm)
- DISCOV (Disable COV)
- DPHONE (Disable phone)
- EMAUTO (Emergency, Auto status)
- EMFAST (Emergency, Fast status)
- EMOFF (Emergency, Off status)
- EMON (Emergency, On status)
- EMSET (Emergency, set value)
- EMSLOW (Emergency, Slow status)
- ENABLE (Enable lines)
- ENALM (Enable alarm)
- ENCOV (Enable COV)
- EPHONE (Enable phone)
- FAST (Fast status)
- GOSUB (Go to subroutine)
- GOTO (Go to line)
- HLIMIT (High limit)
- HOLIDA (Holiday)
- IF/THEN and IF/THEN/ELSE (Conditional control)
- INITTO (Initialize totalized value)
- LLIMIT (Low limit)
- LOCAL (Local variable)
- LOOP (Loop control)
- MAX (Maximum value)
- MIN (Minimum value)
- NIGHT (Night mode)
- NORMAL (Normal operating mode)
- OFF (Off status)
- OIP (Operator interface program)
- ON (On status)
- ONPWRT (On after power return)
- PDL (Peak demand limiting)
- PDLDAT (PDL, define load attributes)
- PDLDPG (PDL, digital point group)
- PDLMTR (PDL, meter monitor)
- PDLSET (PDL, setpoints)
- RELEAS (Release)
- RETURN (Return/end subroutine)
- SAMPLE (Sample a statement)
- SET (Set point value)
- SLOW (Slow status)
- SSTO (Start/stop time optimization)
- SSTOCO (SSTO coefficients)
- STATE (State text command)
- TABLE (Table of coordinates)
- TIMAVG (Average over time)
- TOD (Time of day, digital points)
- TODMOD (TOD modes)
- TODSET (Time of day, analog points)
- WAIT (Wait time)
- Overview
- Glossary
- Appendix A—PPCL Reserved WordList
- Index
Control Option Comparisons—Start/Stop Time Optimization (SSTO)
Siemens Building Technologies, Inc. 2-15
Cooling Season—Optimum Stop Time
If the indoor temperature is less than the desired temperature, then the
optimum stop time is:
OE + ((10 * CR * d)/f) + AE
Where:
OE = Occupancy end time from SSTO command.
CR = Cooling retention coefficient in hours (ccoef2) from
SSTOCO command.
d = Indoor temperature minus the desired temperature.
f = Outdoor temperature minus the desired temperature.
AE = Adjust end time from SSTO command.
If the indoor temperature is greater than or equal to the desired
temperature, the optimum stop time is LE:
Where:
LE = Latest end time from SSTO command.
APOGEE PPCL User’s Manual
2-16 Siemens Building Technologies, Inc.
Heating Season—Optimum Start Time
If the indoor temperature is less than the desired temperature, then the
optimum start time is:
OB + (d x HC) - ((d * f * HT) / 25) + AB
Where:
OB = Occupancy begin time from SSTO command.
d = Indoor temperature minus the desired temperature.
HC = Heating coefficient (hcoef1) from SSTOCO command.
f = Outdoor temperature minus the desired temperature.
HT = Heating transfer coefficient (hcoef3) from SSTOCO
command.
AB = Adjust begin time from SSTO command.
If the indoor temperature is greater than or equal to the desired
temperature, then the optimum stop time is LB:
Where:
LB = Latest begin time from SSTO command.