Operating Instructions
Table Of Contents
- Cyber security disclaimer
- How to Use This Manual
- Chapter 1—Introduction
- Chapter 2—Hardware Features
- 16- and 24-Point Compact Series Diagram
- 36-Point Compact Series Product Diagram
- Supported Point Types
- Compact Series Backup Batteries
- Memory
- Communication Connections
- Compact Series Specifications
- BACnet Compact Series Specifications
- Compact Series Smoke Control Application Requirements
- HOA (Hand-Off-Auto) Upgrade Kits
- PXC Compact on P1
- PXM10S/T Product Overview and Description
- Unitary Equipment Controller
- TX-I/O Product Range Overview
- PX Series Enclosures and Service Boxes
- Chapter 3—Applications
- Chapter 4—Troubleshooting
- Glossary
- Index
Chapter 3—Applications
Applications
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Siemens Industry, Inc.
Owner's Manual
553-104
Building Technologies
2018-10-01
Daylight Saving Time
The Daylight Saving Time (DST) functionality adjusts the system time to match the
daylight saving time change-over. If your area uses daylight saving time, this feature
offers a convenient method to automatically adjust the system clock.
Equipment Scheduling
Equipment Scheduling is designed to provide 365-day, time-based control of a space
in a facility. The basic design of this application begins with a definition of the space,
called a zone. The state of the zone dictates how the field panel controls the points
associated to that space. The state of the zone is known as the mode (in this
document it is referred to as the current mode value of the zone).
Loop/Loop Tuning
The loop application is the PPCL Proportional, Integral, Derivative (PID) control loop
algorithm. The loop tuning application evaluates and calculates gains and sample
times for existing LOOP statements in PPCL. This feature calculates appropriate
Proportional, Integral and Derivative (PID) gains and sample time for a selected control
loop, based on specific building and control information defined in the LOOP
statement. When complete, you decide how to apply the newly calculated variables.
Start-Stop Time Optimization (SSTO)
Start/Stop Time Optimization (SSTO)
is an optional, self-adjusting routine that affects
the start and stop times of various occupancy modes. SSTO can help conserve energy
by starting a heating or cooling process, prior to occupancy, as late as possible. SSTO
can also stop heating or cooling a zone as early as possible, prior to vacancy.
For example, a meeting in August occurs at 1:00 P.M. and lasts until 4:00 P.M. Based
on the information provided in SSTO parameters, the equipment scheduling application
calculates the latest possible time cooling can start and still reach the cooling setpoint.
Also, calculations are made to determine the earliest time cooling can stop without
affecting comfort limits.
Time and Calendar
Calendar dates (in the form of day shifts and replacement days) are entries used to
supplement the Equipment Scheduling application.
Time functions compensate for Daylight Savings Time (DST) and provide time-based
control for building equipment.