Introduction - Siemens Open Processor Owner's Manual

Valid operator commands to change point values or to command field points are handled
similarly to field input or control program commands. For example, if an operator issues an
ON command to a fan starter, the Open Processor issues the ON command to the field point
and updates the value in its memory. In this case, the operator overrides the control program.
The fan point would remain ON until the operator commands the fan OFF or until the
operator releases the point back to automatic control.
NOTE:
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Up to 100 Open Processors and field panels (addressed 0-99) can be connected on a building
level network (BLN), also known as a Protocol 2, P2, or peer-to-peer network. Information
from any Open Processor or field panel on the BLN can be accessed and shared. The BLN
provides connections within or between buildings by using dedicated network wiring,
dedicated telephone lines, or dial-up telephone lines.
More than one operator can access the network at one time. For example, as one operator
accesses the system, another operator can access the system at another terminal or from a
remote site by using a modem. Alarms are reported to the alarm printer even as an operator
accesses information.
When an operator issues a command over the network, the Open Processor or field panel at
which the operator issued the command does the following:
x
Validates the command,
x
Determines the command's destination.
x
Passes the command to the destination over the network.
Figure 1-2 illustrates the following process: The operator issues a command at the Open
Processor. The Open Processor is located in the lower level of the building. This command is
sent through the BLN to the Open Processor located on the penthouse to control the main air
handling unit of the building.
For more information about networking, contact your local Siemens Building Technologies
representative.
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The Open Processor can operate as a stand-alone controller. A single Open Processor is
typically used in remote sites where only the equipment for that site needs to be controlled.
Communications with the remote site is achieved using modems.
Siemens Building Technologies, Inc.
Landis Division
Either the Open Processor or the Trane system can command Trane equipment
controllers.

Introduction

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