| Multi-Channel Configuration
The ALANN IV is a 12 VDC
microprocessor based (non-volatile memory) unit with eight separate channels connected to
field sensor devices to confirm normal system operation. A red LED is associated with each
alarm channel to indicate abnormal conditions. The sensors are normally open dry contacts
and include an "end of line" resistor which enables the module to confirm wiring
integrity.
First
Out Indication
When an alarm is detected, its
corresponding LED flashes continually and the module proceeds with the shutdown. Any
subsequent alarm will show its LED in a steady "on" condition.
Shutdown Sequencing
For applications where timing is
critical, the ALANN IV can be configured to
activate or deactivate a process in a predetermined sequence. It also provides a signal
for connection to an auxiliary device such as a telephone dialer or
annunciator.
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