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
Program Methodology—Arithmetic Operators
Siemens Building Technologies, Inc. 1-27
Subtraction
Unitary pre-APOGEE APOGEE BACnet
Syntax
pt1 = value1 - value2
pt1 A point name or local variable that receives the value of
the calculation.
value1,
value2
Point names, local variables, expressions, or numbers
that are used in the calculation.
Use
Subtracts a value (value2) from another value (value1) and stores
the difference in a defined location (pt1).
Example
300 COUNT = COUNT - 1.0
APOGEE PPCL User’s Manual
1-28 Siemens Building Technologies, Inc.
Arithmetic Functions
Arithmetic functions perform mathematical calculations on a number
(value). When used in PPCL, the result of a calculation is usually
assigned to a point name for future reference. For information on the
order in which arithmetic functions are evaluated, see the Order of
Precedence section in this chapter.
PPCL supports the following arithmetic functions:
• Arc-Tangent (ATN)
• Complement (COM)
• Cosine (COS)
• Natural Antilog (EXP)
• Natural Log (LOG)
• Root (.ROOT.)
• Sine (SIN)
• Square Root (SQRT)
• Tangent (TAN)
Each arithmetic operator is described in more detail on the following
pages.