82 Input/Output Modules
Trident Planning and Installation Guide
Model 3301 Digital Input Module Specifications
Feature Specification
Points 32, commoned
Nominal input voltage 24 V DC
Operational voltage range 15–30 V DC
Absolute maximum input voltage 33 V DC
Absolute maximum reverse input voltage –0.6 V DC
Input delay <10 ms, On to Off or Off to On
TC = 6.4 ms, –3dB @ 25Hz
Input impedance >30 kΩ without baseplate
≈3 kΩ with baseplate
Input power 0.2 W/pt, @ 24 V DC
0.5 W/pt, @ 33 V DC
Input threshold 0–5 V DC = Off region
6–14 V DC = transition region
15–30 V DC = On region
Diagnostic (loss of view) Force-to-value diagnostic (FVD),
<2 ms/test
Maximum input toggle rate to maintain
diagnostic fault coverage
<20/sec
FVD Off-state glitch
Duration <2 ms
Magnitude ≈36% test voltage
Output Impedance 0–5 V DC, ≈100 kΩ
ADC 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
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