triconex Digital Input Module 3301
triconex Digital Input Module 3301
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Feature Specification
Points 32, commoned
Nominal input current 4–20 mA DC
Operational current range 2–22 mA DC
Absolute maximum field voltage 33 V DC
Absolute maximum reverse field voltage – 0.6 V DC
Absolute maximum input current 50 mA DC
Input bandwidth (3dB) 16 Hz
Source impedance 180 Ω
Input impedance (with baseplate) 250 Ω
I to V resistor 100 Ω, ±0.01%
Resolution 12 bits
Absolute error 0.15% of full scale (20 mA)
Diagnostic Force-to-value diagnostic (FVD)
Scan time <1 ms for all 32 points
Functional-to-protective-earth isolation 500 V DC, minimum
Functional-to-functional-earth (logic)
isolation
800 V DC, minimum
The Tricon is a state-of-the art
controller that provides fault tolerance
by means of Triple-Modular Redundant
(TMR) architecture. TMR integrates
three isolated, parallel control systems
and extensive diagnostics in one control
system. The system uses two-out-ofthree
voting to provide high-integrity,
error-free, uninterrupted process operation
with no single point of failure.
The Tricon controller uses three identical
channels. Each channel independently
executes the control program in
parallel with the other two channels.
Specialized hardware/software voting
mechanisms qualify and verify all
digital inputs and outputs from the
field, while analog inputs are subject to
a mid-value selection process.
Because each channel is isolated from
the others, no single-point failure in any
channel can pass to another. If a hardware
failure does occur on one channel,
the other channels override it. Meanwhile
the faulting module can easily be
removed and replaced while the
controller is online without interrupting
the process.
Setting up control programs is simplified
with the triplicated Tricon system,
because it operates as a single control
system from the user’s point of view.
The user terminates sensors and actuators
at a single wiring terminal and
programs the Tricon with one set of
control program logic. The Tricon
controller manages the rest!
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