APP APP-601 Operating Manual Download

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Hardware

4-12

4.5.4 Alarm Circuit Board

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The alarm board contains (8) relay outputs. A selection of alarms can be mapped to the relay
outputs. More than one alarm can be mapped to a relay, note exceptions below. Alarm mapping is
done via software in the Point Assignment Record.



The relays are indirectly energized via a 5V signal coming from the DSP circuit board. See
“Specifications” for relay contact ratings.

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Each relay uses an on-board jumper that will allow the contact to be either normally open or
normally closed. The board is labeled for easy jumper placement.



The relay board utilizes a 16 position pluggable connector. The plug will accept a maximum wire
size of 14AWG.

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Alarm selections include:

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Power

Relay is energized when system power is applied. Most users will put contact in the normally
closed position. We recommend Power be mapped to its own output, no other alarm should be
mapped to those outputs.



On Line

Relay is energized when the system program starts and the system is ready to record or is
recording. Most users will put this contact in the normally closed position. We recommend
On Line be mapped to its own output, no other alarm should be mapped to those outputs.



Off Line

Relay is energized when the system program, APP Recorder, is stopped. Most users will set
this contact to the normally open position.

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Clock Sync Loss

Relay is energized when the DSP/IRIG board has completely lost its IRIG-B input, such as
disconnecting the cable, or the satellite clock sends a signal (4 bits per the IEEE standard) that
an error greater than 1ms has occurred. The relay will stay energized until a synchronized
condition is reestablished. Most users will set this contact as normally open.



Chassis to Chassis Communication Error

Relay will energize if any data acquisition chassis stops communicating with the computer
control chassis for a period of 5 minutes or more. The relay will stay energized until the
problem chassis begins proper communication. Most users will set this contact in the
normally open position.



Chassis to Master Station Communication Error

Relay will energize if the recorder modem or network card stops communicating with the
APP recorder software. The relay will remain energized until the problem is fixed. Most users
will set this contact in a normally open position.

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Disk Full

Relay will energize when the computer hard drive memory falls below a user programmable
limit. The relay will remain energized until the hard drive free space goes above the user
programmable limit. However, if the history overwrite feature is enabled, the alarm relay will
not energize. Most users set this contact in the normally open position.



Trigger

Relay will energize when the recorder trips, records a transient record. The relay will remain
energized for the duration set in Alarm Duration field. The default is 10 seconds. Most users
will set this contact in the normally open position.



Disturbance Record

If a trigger has been defined as a disturbance trigger, in the Point Assignment Record, the
relay will energize when the recorder trips. The relay will remain energized for the duration
set in Alarm Duration field. The default is 10 seconds. Most users will set this contact in a
normally open position.