TRICONEX 3301S2 is a TMR Triple Modular Redundancy digital input module for Triconex Safety Instrumented System (SIS), also commonly referred to as DI3301S2. It features three internally isolated independent electronic channels for parallel acquisition of field discrete signals. Valid data is output to safety logic programs after 2‑out‑of‑3 voting by the main processor. Designed for 24 VDC industrial discrete signal acquisition, DI3301S2 does not support Sequence‑of‑Events (SOE) recording. The module provides comprehensive channel‑level on‑board diagnostics. Normal signal acquisition is maintained even under single‑point hardware faults. It supports hot‑standby modules and non‑stop hot‑swap maintenance, and is widely deployed for safety signal acquisition in high‑risk industrial environments. TRICONEX 3301S2 shares common hardware baseplates with the 3311S2 series. Their core differences lie in input response, diagnostic functions and SOE capability.
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Triconex DI3301S2 Digital input module Key Specifications
Number of points: 32 commoned (all 32 points share a common connection)
Nominal input voltage: 24VDC
Operational voltage range: 15-30 VDC
Absolute maximum input voltage: 33 VDC
| Parameter Item | TRICONEX 3301S2 (DI3301S2) |
|---|---|
| Channel Count | 32 channels, common‑ground type |
| Rated Input Voltage | 24 VDC |
| Operating Voltage Range | 19.2‑30 VDC |
| Absolute Maximum Input Voltage | 33 VDC |
| Absolute Reverse Input Voltage | ‑0.6 VDC |
| Input Delay | On‑off time constant 2.86 ms, ‑3dB bandwidth 55 Hz |
| Input Impedance | ＞30 kΩ without baseplate; approx. 3 kΩ with baseplate installed |
| Per‑Point Input Power Consumption | 0.2W / point @24VDC; 0.5W / point @33VDC |
| Diagnostic Type | Forced‑Value Diagnostic (FVD), single test duration ＜2 ms |
| Diagnostic Coverage Maintenance | Maximum input toggle rate ＜20 times / second |
| ADC Full‑Channel Scan Time | ＜1 ms for all 32 channels |
| Isolation: Functional Ground to Protective Ground | Minimum 500 VDC |
| Isolation Between Functional Grounds (Logic Ground) | Minimum 800 VDC |
Triconex DI3301S2 Digital input module Performance Characteristics:
Input delay: Less than 10 ms for transitions from On to Off or Off to On
Input impedance: Greater than 30 kΩ without baseplate, 3 kΩ with baseplate
ADC scan time: Less than 1 ms for scanning all 32 points
Safety Features
Isolation: Functional earth to protective earth isolation minimum 500 VDC, functional earth to functional earth isolation minimum 800 VDC
Diagnostic capabilities:
Force-to-value diagnostic (FVD) with response time less than 2 ms per test
Maximum input toggle rate: Less than 20 toggles per second to maintain diagnostic fault coverage
Other Considerations
Power consumption: 0.2 W per point at 24 VDC, 0.5 W per point at 33 VDC
Designed for use in safety-critical applications
Product Comparison (3301S2 VS 3311S2)
| Comparison Item | 3301S2 (DI3301S2) | 3311S2 |
|---|---|---|
| Channel Count | 32 common‑ground channels | 32 common‑ground channels |
| Rated Voltage | 24VDC | 24VDC |
| Input Time Constant | 2.86 ms, ‑3dB@55Hz | 0.13 ms, ‑3dB@1.2 kHz |
| SOE Sequence‑of‑Events Recording | Not supported | Supported, resolution ≤1 ms |
| Diagnostic Functions | FVD Forced‑Value Diagnostic | FVD + FTD Dual Diagnostics |
| Compatible Baseplates | 2301S2, DI external terminal baseplate | 2301S2, DI external terminal baseplate |
Notes
- DI3301S2doesnotsupportSOEsequence‑of‑eventsrecording.Select3311S2ifmillisecond‑scaleeventloggingisrequired.VerifythecompletepartnumberTRICONEX3301S2duringprocurementtoavoidversionconfusion.
- Themoduleshallonlybefittedwithcompatiblebaseplatesidentifiedbymechanicalkeying.Forcedinstallationontomismatchedbaseplateswillresultinhardwaredamage.
- Maximuminputvoltageshallnotexceed33 VDCandreversevoltageshallnotexceed‑0.6 VDC.Overvoltagewillburnoutchannelcircuits.
- Maximuminputsignaltogglerateshallnotexceed20timespersecond.Highertogglerateswilldegradediagnosticfault‑coveragecapability.
- IlluminatedfaultLEDindicateschannelabnormalityratherthanoverallfailureofTRICONEX3301S2.Troubleshootfieldloopspriortodirectmodulereplacement.
- Forhazardous‑areadeployment,usequalifiedexplosion‑proofterminalpanelssuchas9573‑610Fandstrictlyfollowexplosion‑proofinstallationspecifications.
FAQ
Q:ArebaseplatesinterchangeablebetweenDI3301S2and3311S2?
A:Baseplatesarecompatible;bothcanusethe2301S2baseplate.Howeverfunctionsarenotinterchangeable.Replacingwith3301S2willloseSOEevent‑recordingcapability.
Q:DoesilluminatedfaultLEDonTRICONEX3301S2meanpermanentmoduledamage?
A:ThefaultLEDonlyalertschannelfaults.Checkexternalwiringandfieldswitchloopsfirst;mostissuesarenotinternalmodulehardwarefailures.
Q:Whatinput‑signalvoltagedoesDI3301S2accept?
A:Rated24 VDC,operatingrange19.2‑30 VDC,absolutemaximumwithstandvoltage33 VDC.48Vsignalscannotbeconnected.
Q:Does3301S2supporthot‑swapandwillthesystemshutdown?
A:Hot‑swapissupported.Thesystemkeepsrunningduringmodulereplacement,whichisstandardmaintenancepracticeforTriconexSISsystems.
Q:Whatkeyinformationshallbeconfirmedwhenpurchasing3301S2?
A:Confirmsystemfirmwarerevision,baseplatemodel,field‑sitevoltagelevel,andwhetherSOEeventrecordingisrequiredfortheproject.
Q:Whatistheper‑channelpowerconsumptionofDI3301S2forloop‑sizingreference?
A:0.2Wperpointat24 VDCandmaximum0.5Wperpointat33 VDC.Thesevaluesshallbeusedforloop‑loadcalculation.
Q:Can3301S2accept4‑20 mAanalogsignals?
A:No.Thisisadigitalinputmodulefordiscreteswitchsignalsonly.UsecorrespondingAIanalog‑inputmodulesforanalogsignals.
Q:Whatdoesmaximuminputtogglerate＜20timespersecondmean?
A:Whenfield‑switchsignalstogglemorethan20timespersecond,theinternalFVDdiagnosticfunctionbecomesinactive,fault‑detectioncoverageislostandsafetyrisksmayarise.
ProductTags
TRICONEX3301S2,DI3301S2,TriconexDigitalInputModule,SISSystemDICard,TMRTripleModularRedundancyModule,24VDCDigitalInputCard,TriconSafetySystemModule,32‑ChannelDigitalInputModule
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