Description
1. Basic Information
| Item | Content |
|---|---|
| Model | T8461 (B‑series), conformal coated variant T8461C (C‑Coat)Rockwell A… |
| Series | Trusted T8000 TMR Triple‑Redundant Safety Control System |
| Product Type | 40‑Channel TMR 24/48VDC Digital Output Module |
| Safety Certification | IEC61508 SIL3, TÜV approved; ATEX: B‑series Ex nA IIC T4 GC; C‑series Ex ec IIC T4 GC |
| Installation | Slot‑mount in T8100 main chassis or T8300 expander chassis, hot‑swap supported |
| Matching VFTA | T8861 (40‑channel DO field termination assembly, fully compatible for T8461 / T8461C) |
| Manufacturer | ICS‑Triplex (Rockwell Automation) |
| Lifecycle | Active production; origin Mexico; standard warranty 1 yearRockwell A… |
| Difference vs T8461C | Identical channel count, logic and pin‑out. T8461C adds conformal C‑Coat PCB protection and upgraded Ex ec certification for salt‑mist / corrosive offshore sites. Legacy T8461 (B‑series): Ex nA IIC T4 GC without conformal coating. |
2. Hardware Specifications
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Electrical & Channel Parameters
‑Channel count: 40 channels solid‑state sourcing digital output; every channel full TMR triple‑path and hardware 2‑out‑of‑3 voting
‑Field load voltage: Software configurable per‑channel 24 VDC (18‑32 VDC) or 48 VDC (36‑56 VDC), no hardware modification required
‑Output current rating: 0.75A continuous per channel, divided into 5 independent power groups (8 channels each), max.6A per power group, for 24V /48V solenoid valves and alarm beacons
‑Built‑in electronic over‑current protection per‑channel, external channel fuses not required; minimum load 50 mA for line‑monitor function.
‑Backplane power:20‑32 VDC from chassis backplane; typical power consumption 22 W, max.25 W
‑SOE function:On‑board hardware SOE, 1 ms time‑stamp resolution. Timestamp generated locally upon output status change or loop‑fault without main‑controller CPU loading.
‑Isolation:2500 V impulse opto‑galvanic barrier between field and system side; 250 V isolation between power groups.
‑Hardware enhancement(T8461C):Full‑board C‑Coat conformal coating against humidity, salt‑spray and corrosive industrial gas for offshore service‑life improvement.
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Front‑panel & Interface
‑Front‑panel LEDs:Module OK, Fault, Active / Standby status indicators, plus per‑channel status LEDs.
‑Rear‑side dual 96‑way connectors interfacing to T8861 VFTA. Smart‑slot supports hot‑swap module replacement without disconnection of field wiring.
-
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 T8461C: Ex ec IIC T4 GC, preferred for offshore platforms, marine modules and high‑corrosion refinery plants; standard T8461 for on‑shore ESD / Fire‑Gas installations.
3. Key Functions
- Channel‑wise TMR triple‑redundant 3‑2‑0 hardware voting:Each output channel is triplicated 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.
- Software‑selectable 24 V /48 V output:Individual channel can be configured for 24VDC or 48VDC field load, supporting two solenoid coil types within single module, reducing spare‑part inventory.
- Per‑channel comprehensive loop diagnostics:With T8861 VFTA fitted, line‑monitor can be enabled channel‑by‑channel to detect open‑load, short‑circuit and insufficient‑load faults; timestamped fault messages uploaded to system software.
- Hardware local SOE reporting:Output status change and loop‑fault triggers on‑module 1 ms accurate event timestamp for post‑incident safety analysis.
- Hot‑swap maintenance:Module can be replaced online; field wiring on VFTA 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(T8461C):PCB coating protects electronic components from high‑humidity, salt‑spray and corrosive process gas for extended lifetime under severe offshore site conditions.
- Periodic background self‑test:Continuous monitoring for backplane bus, triple‑channel circuitry and VFTA link for fast fault alarming and localization.
4. Typical Applications
‑Petrochemical refinery and natural‑gas plant safety systems: driving both 24 V and 48 V solenoid valves, alarm beacons.
‑Compared with T8451 (2A per‑channel, only 24 V support), T8461 main advantage is native 48VDC solenoid support at 0.75A per‑channel rating.
‑Can be used for pure‑DO Fire&Gas loops; cannot be configured as digital‑input unlike T8448.
5. Important Notes
- Must pair with T8861 VFTA, field cables cannot connect directly to module. T8861 is DIN‑rail mounted termination assembly; VFTA is fully shared between T8461 and T8461C, no modification required.
- When fitted inside T8300 expander chassis, T8310 expander‑processor must be present in same chassis.
- Firmware build‑version must strictly match module hardware variant. T8461 firmware cannot run on T8461C and vice‑versa; verify build‑number before spare‑part replacement. Mechanical dimension and pin‑out are physically compatible, but firmware shall not be mixed.
- Line‑monitor function must be software‑enabled per‑channel; field load must exceed 50 mA, otherwise open‑load fault will be reported; not suitable for ultra‑low‑current loads.
- Output is sourcing‑type. Each channel independently configurable for 24 V or 48 V; mixed‑voltage loops are allowed within one module subject to VFTA power‑group constraints. Built‑in electronic short‑circuit latch‑up protection.
- C‑Coat conformal coating protects printed‑circuit board only. Module must be installed inside suitable cabinet for hazardous‑area compliance.
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