Siemens Open Processor User Manual

Open Processor with Trane Driver Owner's Manual
4-10 Siemens Building Technologies, Inc.
Landis Division
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The point priority determines if an operator or a particular control program is responsible for
controlling the point. The five priority levels are described in the Table 4-4.
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OPER
(Operator)
The highest command priority. The control program is
overridden and an operator has direct control for commanding
the point. A point commanded by an operator must have its
priority lowered in order for the control program to resume
control of the point. This change in priority is known as
releasing a point
.
SMOKE The point is commanded by a smoke control program. Smoke
control is a special control program that monitors smoke
alarms.
EMER
(Emergency)
The point is commanded by an emergency control program.
Emergency control is a special control program that
commands a point during emergency situations, for example a
smoke detector goes into ALARM and turns on the exhaust
fan at EMER priority.
PDL
(Peak Demand
Limiting)
The point is commanded by a Peak Demand Limiting (PDL)
control program. PDL control is a special energy management
program that limits electrical demand by turning off electrical
loads when demand approaches a set point (for example
shutting down an air handling unit if demand approaches set
point).
NONE The lowest command priority level. The point can be
commanded by the standard PPCL control program. The point
is not controlled by the operator or special control programs.
Most point commanding in a building system is done
automatically by PPCL programs commanding points with the
NONE priority.
In most cases, the priority of a point should be NONE (under general system control).
Depending on the type of application, the system can change point priority to prevent
interaction by other applications (either by PPCL or an application). For example:

Siemens Open Processor Specifications

General

Brand	Siemens
Model	Open Processor
Category	Computer Hardware
Language	English