A-12 Issue 4 February 1997
363-208-011
Applications
Miscellaneous Discrete/Environmental
Alarm and Control Applications
NOTE:
Miscellaneous discrete environmental
status
points operate independently
of the parallel telemetry and status points. Example: an environmental sta-
tus condition that turns on a miscellaneous discrete environmental status
point
will not
turn on a parallel telemetry ID or far end ID status point.
Miscellaneous discrete environmental
alarm
points are coordinated with
the parallel telemetry alarm and status points. Example: an environmental
alarm condition that turns on a miscellaneous discrete environmental
alarm point
will
turn on the appropriate parallel telemetry alarm point and
system ID and far end ID status point.
Inputs
Fourteen miscellaneous alarm or environmental inputs are available at the COT
site for monitoring local environmental conditions such as open door, high
temperature, low fuel, etc. The inputs can also be used to remote alarms from
collocated equipment such as the DDM-Plus system. These inputs (TLMI 1-14)
are activated by contact closures to ground which provide -48v nominal (-60v
maximum) open circuit voltage and source 2 ma. maximum current when
activated.
Outputs
Four environmental control outputs are available at the COT site for controlling
external equipment such as generators, pumps, etc. These outputs (TLMO 1-4)
tolerate -60v maximum open circuit voltage and source 35 ma maximum current
when activated. Transient voltages up to 135v are tolerated for up to 1 ms.
Outputs TLMO 5-16 are not used at the COT site.
NOTE:
The output common leads, TLMO C must be grounded for all applications,
even when the control outputs TLMO 1-4, are not used. They can derive
ground from the internally grounded VTR leads.
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