3-26 | Thermox TM 2000 Oxygen Analyzer
Alarm Contact Connections
Follow general EMC grounding and shielding requirements for all
wiring as described in the “General Wiring Requirements” section at
the beginning of this Wiring section.
This section describes how to make wiring connections for any alarm
devices you want to connect to the control unit. Information on how to
set up alarms in software is described in the Controller/User Interface
chapter.
The Series 2000 control unit provides four sets of alarm contacts, which
are labeled as follows (see Figure 3-23):
ALARM 1A ALARM 2A ALARM 3A ALARM 4A
ALARM 1B ALARM 2B ALARM 3B ALARM 4B
The Watchdog Timer Alarm connections are labeled as follows on the con-
trol unit:
ALARM 1A
ALARM 1B
See the “Watchdog Relay” section in the Controller/User Interface chapter
for complete information on the watchdog timer alarm. The watchdog
alarm contacts are normally closed during system operations (deactivat-
ed). A watchdog event triggers these alarm contacts to an open condition.
If you have a watchdog event, and the system returns to normal opera-
tions, then the watchdog alarm will reset. The system will retain in memo-
ry the last time the watchdog condition occurred (Exception Log).
The Service Alarm connections are labeled as follows:
ALARM 2A
ALARM 2B
See the “Service Alarm” section in the Controller/User Interface chapter
for complete information on what events trigger the transfer of the service
alarm. The service alarm contacts are normally closed during system op-
erations (deactivated). A service alarm event triggers these alarm contacts
to an open condition.
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