B 3 Acoustic Messages, Field Horn And Control Room Horn; B 3.1 Activating Horns By Field Signals - ABB Freelance 2000 Manual

Section B

B 3 Acoustic Messages, Field Horn and Control Room Horn

For local alarming field horns can be connected to a binary output of the process stations. For
central alarming in the control room one control room horn can be connected to each operator
station.
The horns can be activated by:
• pre-processed field signals
• messages from the function blocks.
• system messages
Horn function blocks must also be configured in the process stations.

B 3.1 Activating horns by field signals

After preprocessing the field signals, a resulting binary signal must be connected to the input of
the horn function block.
To activate the control room horn, an event message is generated by the horn function block.
DigiVis activates the control room horn after evaluating this message.
To address the field horn, the output of the horn function block is connected to the field horn via
a binary output.
An event message is an internal message of the Freelance 2000 system. It is not visible
to the operator. Event messages are used at points where a Freelance 2000 process
station is able to control a function in the operator station directly. Examples of this are
the horn function and logs.
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B-14
Messages and Hints
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