ICS Triplex T8461 TMR Triple Modular Redundant Digital Output Module

1、 Product Overview

T8461 physical picture
T8461 belongs to Rockwell ICS Triplex Trusted T8000 safety control system, and is a 40 channel high-density TMR digital output card. The original model is subdivided into: T8461, T8461C, which adopts 2oo3 the third mock examination redundant hardware architecture, single channel internal three channel independent circuit voting, and single point hardware failure without interruption output. It has passed the T ∨ V IEC 61508 SIL3 safety certification, and is specially designed for ESD emergency shutdown, safety interlock, fire and gas protection and other high safety circuits.
Core redundancy principle
Each output channel is equipped with three independent driver circuits, and the internal hardware voting unit outputs the final control signal; Single slice fault → fault-tolerant continuous operation; Two slice faults → safety shutdown output, meeting SIL3 «one fault tolerance, two fault safety failure» specifications.

2、 Key electrical specifications

1. Channels and Grouping
Total output channels: 40 TMR digital outputs
Power supply grouping: 5 independent isolated power supplies, 8 channels per group, maximum 6A per group
On site output voltage: 24VDC/48VDC hardware optional, on-site withstand 18~60VDC
Single channel continuous current: 0.75A; minimum carrying current 25mA (report open circuit if below)
Equivalent resistance for turning off leakage current: 33k Ω; internal resistance for conduction is only 0.6 Ω
Single channel built-in electronic current limiting self-locking protection, no need for external fuses
2. System power supply and isolation
Backplane system power supply: 20~32VDC
Channel isolation: 2500V pulse optoelectronic isolation, surge resistance, common mode interference suppression
Channel crosstalk:>-40dB, to avoid interference between adjacent outputs
Whole machine power consumption:<20W
Response time: Channel action<1ms, SOE event resolution 1ms
3. Environment and Machinery
Working temperature: -20 ℃~+60 ℃ (wide temperature industrial grade)
Protection: IP30 inside the rack, cannot be directly used in explosion-proof areas (requires matching intrinsic safety isolation barriers)
Size: 135 × 85 × 35 mm; Weight approximately 500g
Seismic and Vibration Resistance: Compliant with IEC 60068 Industrial Standard for Shock and Vibration

3、 Core functional characteristics

Full channel real-time line diagnosis
Automatic detection of open circuit, short circuit, load loss, and overcurrent in the on-site circuit, with panel LED direct alarm and fault information uploaded to TriStation software.
On board SOE event sequence record
1ms high-precision time scale, recording the timing of valve, solenoid valve, and relay actions for accident traceability analysis.
Online hot swappable maintenance
Support spare slot SmartSlot/paired adjacent slot Companion Slot, non-stop replacement of faulty modules, and uninterrupted safe circuit operation.
Improve the status indicator lights
Channel LED: Single output on/off, line fault indication
Module overall status LED: Active operation/Standby/Fault alarm three modes
Periodic self-test of the entire machine
The background automatically verifies the voting of the third mock examination voltage and current, anticipates hidden hardware faults in advance, and meets the requirements of SIL circuit periodic test

4、 Security certification and compliance

Safety level: T Ü V certified IEC 61508 SIL3, can be used for emergency stop interlock circuits with safety integrity level 3
EMC standard: IEC 61000-6-2/6-4, stable operation in industrial strong electromagnetic environment
Applicable safety scenarios: ESD emergency shutdown, FGS fire and gas system, boiler/turbine safety interlock, explosion-proof area valve control circuit

5、 Typical application scenarios

Oil and gas: wellhead emergency shut-off valve, compressor ESD, long-distance pipeline interlock
Thermal/nuclear power generation: turbine trip, boiler safety door, auxiliary equipment protection circuit
Fine chemical/refining: reactor overheating and overpressure shutdown, toxic medium cut-off
Pharmaceutical and water treatment: explosion-proof solenoid valve, safety baffle, fire linkage control
High reliability switch actuator drive for rail transit and offshore platforms

6、 Supporting facilities and software

Adaptation system: Trusted T8000, Tricon EX/TSA security controller backplane
Configuration software: TriStation 1131, supports channel parameter, fault threshold, SOE function configuration
Supporting terminals: Dedicated T8 series terminal base, divided into 24V/48V versions, grouped for independent power supply

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