Description
1. Basic Information
| Item | Content |
|---|---|
| Model | T8403C (C‑Coat conformal coated version) |
| Series | Trusted T8000 TMR Triple‑Redundant Safety Control System |
| Product Type | 40‑Channel 24VDC TMR Digital Input Module |
| Safety Certification | IEC61508 SIL3, TÜV approved; ATEX: Ex ec IIC T4 GC for C‑series modulesRockwell A… |
| Installation | Slot‑mount in T8100 main chassis or T8300 expander chassis, hot‑swap supported |
| Matching FTA | T8803 (fully compatible with T8403, no FTA modification required) |
| Manufacturer | ICS‑Triplex (Rockwell Automation) |
| Lifecycle | Active production; origin Mexico; standard warranty 1 yearRockwell A… |
| Difference vs T8403 | Identical channel count, logic and connector pin‑out. T8403C adds conformal C‑Coat PCB protection and upgraded Ex ec certification for corrosive / salt‑mist sites. Legacy T8403 (B‑series): Ex nA IIC T4 GCRockwell A…. |
2. Hardware Specifications
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Electrical & Channel Parameters
‑Channel count: 40 channels of 24 VDC digital input; every channel with full TMR triple‑path acquisition and hardware 2‑out‑of‑3 voting
‑Input signal: Dry contact, PNP / NPN active 24 VDC signal; operating range 18‑32 VDC; typical per‑channel input current 2 mA
‑Backplane power:20‑32 VDC from chassis backplane; typical power consumption 15‑18 W, max.20 W
‑Sampling:σ‑delta ADC triple‑channel synchronous sampling, configurable threshold. Per‑channel independent line‑monitoring for open‑circuit and short‑circuit detection
‑SOE function:On‑board hardware SOE, 1 ms time‑stamp resolution. Timestamp generated locally upon channel status change without main‑controller CPU loading
‑Digital filter:Per‑channel configurable 50/60 Hz noise filter; isolation withstand 2500 V impulse opto‑galvanic barrier
‑Hardware enhancement:Full‑board C‑Coat conformal coating against humidity, salt‑spray and corrosive industrial gas, improving service‑life in harsh offshore / chemical plants.
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Front‑panel & Interface
‑Front‑panel LEDs:Module OK, Fault, Active / Standby status indicators.
‑Rear‑side dual 96‑way connectors interfacing to T8803 FTA. Smart‑slot supports hot‑swap module replacement without disconnection of field wiring.
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Environmental Conditions
‑Operating temperature:0℃ ~ +60℃; Storage temperature:‑40℃ ~ +70℃
‑Relative humidity:5‑95 % non‑condensing; IP20 for cabinet installation
‑Hazardous‑area rating: C‑series Ex ec IIC T4 GC, superior to B‑series T8403 (Ex nA); enhanced resistance for salt‑mist and corrosive‑gas environment.
3. Key Functions
- Channel‑wise TMR triple‑redundant 3‑2‑0 hardware voting:Each of 40 field signals is duplicated into three independent sampling circuits inside module, hardware 2‑out‑of‑3 voting executed. Single‑path fault is isolated automatically without disturbing corresponding channel or other channels, eliminating single‑point‑of‑failure risk.
- Per‑channel line diagnostics:Line‑monitor resistors fitted on FTA; line‑monitor function can be enabled / disabled channel‑by‑channel via software; timestamped fault messages uploaded to system software.
- Hardware local SOE reporting:Event timestamp generated on‑module with 1 ms accuracy for post‑incident safety analysis.
- Hot‑swap maintenance:Module can be replaced online; field wiring on FTA side remains connected; other I/O channels keep continuous operation.
- Universal for main / expander chassis:Installable either in T8100 main chassis or T8300 remote expander chassis; I/O points are fully transparent to main processor.
- C‑Coat conformal protection:PCB coating protects electronic components from high‑humidity, salt‑spray and corrosive process gas for extended lifetime under severe site conditions.
- Comprehensive self‑diagnosis:Continuous monitoring for backplane bus, triple‑channel circuitry and FTA link; periodic built‑in self‑test for fast fault alarming and localization.
4. Typical Applications
‑SIS installations within coal‑chemical and refinery plants for acquisition of pressure switches, level switches, flame detectors, manual ESD push‑buttons, valve position feedback.
‑New‑project engineering, replacement for legacy T8402. For indoor non‑corrosive sites either T8403 or T8403C is acceptable; T8403C is mandatory for offshore and high‑corrosion environments.
5. Important Notes
- Must pair with T8803 FTA, field cables cannot connect directly to module. T8803 is DIN‑rail mounted with per‑channel loop fuse protection; FTA is fully shared between T8403 and T8403C.
- When fitted inside T8300 expander chassis, T8310 expander‑processor must be present in same chassis.
- Firmware build‑version must strictly match module hardware variant. T8403 firmware cannot run on T8403C and vice‑versa; verify build‑number before spare‑part replacement.
- Line‑monitor function requires corresponding detection resistors on FTA and software enable per‑channel. Without enable only on‑off status is read without loop‑fault diagnosis.
- Supports dry‑contact as well as PNP/NPN active DC inputs. Not applicable for AC signals; select T8424 for AC digital‑input applications.
- Mechanical dimension and pin‑out are 100 % compatible between T8403 and T8403C for physical interchange, but firmware must be flashed matching exact part‑number.
- C‑Coat conformal coating protects printed‑circuit board only. Module must be installed inside suitable cabinet for hazardous‑area compliance.
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