3515 TRICONEX 3515 Pulse Totalizer Opto-isolated

Description

Pulse Totalizer Module
The model 3515 Pulse Totalizer Input
(PTI) Module provides 32 individual
31-bit counters that operate independently. The counters are used with
active-flow sensors or per-unit sensors
to measure a quantity (count) which is
transmitted to the main processors. At
the time specified by the TriStation
control program, the main processors
clear a single counter or all counters.
The PTI module has three isolated input
channels. Each input channel independently processes all input data and
passes it to the main processors, where
it is voted before processing to ensure
the highest integrity.
Each PTI module provides complete
ongoing diagnostics on each channel,
including channel-to-channel count
comparison. Failure of any diagnostic
on any channel activates the Fault indicator, which in turn activates the chassis
alarm. The Fault indicator points to a
channel fault, not a module failure. The
PTI module is guaranteed to operate
properly in the presence of a single
fault, and may continue to operate with
certain kinds of multiple faults.

Models 3502E, 3503E, and 3505E can
self-test to detect stuck-ON conditions
where the circuitry cannot tell whether
a point has gone to the OFF state. Since
most safety systems are set up with a
de-energize-to-trip capability, the
ability to detect OFF points is an important feature. To test for stuck-ON
inputs, a switch within the input
circuitry is closed to allow a zero input
(OFF) to be read by the optical isolation
circuitry. The last data reading is frozen
in the I/O communication processor
while the test is running.
All TMR digital input modules support
hot-spare capability, and require a separate external termination panel (ETP)
with a cable interface to the Tricon

backplane. Each module is mechanically keyed to prevent improper installation in a configured chassis.

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