Description
1. Basic Information
| Item | Content |
|---|---|
| Model | T8402 |
| Series | Trusted T8000 TMR Triple‑Redundant Safety Control System |
| Product Type | 60‑Channel 24VDC Digital Input Module |
| Safety Certification | IEC61508 SIL3, TÜV approved, 3‑2‑0 fault‑tolerant architecture |
| Installation | Slot‑mount inside T8100 main chassis or T8300 expander chassis, hot‑swap supported |
| Matching FTA | T8802 (60‑channel field termination assembly)Rockwell A… |
| Manufacturer | ICS‑Triplex (Rockwell Automation) |
| Lifecycle | End‑of‑life, no brand‑new original production |
2. Hardware Specifications
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Electrical & Channel
‑Channel count: 60 channels of 24 VDC digital input, internal dual‑path 1oo2D voting per channel
‑Field input voltage:24 VDC, configurable logic threshold; typical per‑channel input current 6 mA
‑Backplane power:20‑32 VDC from chassis backplane; typical power consumption 3 W
‑Sampling:σ‑δ ADC sampling circuit, dual voltage measurement per channel. Individual channel‑wise line‑monitoring for wire‑break and short‑circuit detection, configurable by software
‑SOE function:On‑board hardware SOE, 1 ms time‑stamp resolution, event triggered upon status change
‑Isolation:Galvanic isolation between field side and system side, surge withstand up to 2 kV.
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Front‑panel & Interface
‑Front‑panel LEDs:Module OK, Fault, backplane bus status.
‑Rear‑side 96‑way connector connects to T8802 FTA; Smart‑slot supports hot‑module‑replacement without disconnecting field wiring.
-
Environmental Conditions
‑Operating temperature:0℃ ~ +60℃; Storage temperature:‑40℃ ~ +85℃
‑Relative humidity:5‑95 % non‑condensing; IP20 for cabinet installation; ATEX Zone 2 certified; industrial shock‑vibration resistance.
3. Key Functions
- 1oo2D dual‑path voting acquisition:Each field signal goes through two independent acquisition circuits inside module. Local 1oo2D voting is executed; faulty channel is isolated automatically without impact to other channels.
- Per‑channel line diagnostics:When line‑monitor is enabled, wire‑break and short‑circuit can be detected; timestamped fault messages uploaded to system software.
- Hardware‑based SOE:Event time‑stamp processed locally on module with 1 ms resolution for safety post‑event analysis, without loading main controller CPU.
- Hot‑swap maintenance:Module can be replaced online; field wiring on FTA side remains connected; other I/O channels keep running normally.
- Compatible with TMR system bus:Can be installed either in main chassis or T8300 remote expander chassis; I/O points are fully transparent to main processor.
4. Typical Applications
‑Safety‑instrumented systems for power‑plant and offshore oil‑gas platforms with high‑density discrete signals.
‑Legacy‑system spare‑part replacement; new‑project alternative model:T8403 (40‑channel DI).
5. Important Notes
- T8402 must pair with T8802 FTA, cannot connect field cables directly. T8802 is DIN‑rail mounted, each channel equipped with field‑loop fuse protectionRockwell A….
- It can be fitted into main chassis or T8300 expander chassis; T8310 expander‑processor must be present if used inside expander chassis.
- Firmware build‑version must match whole system firmware, verify build‑number before spare‑part replacement.
- Original manufacturing stopped(EOL); only second‑hand / refurbished / surplus stock available. For new projects select T8403 instead.
- Line‑monitor function requires corresponding resistors configured on FTA and software enable per‑channel; without enable only on‑off status is read without wire‑break diagnosis.
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