Description

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　　T8451C Other Names:

Analog Module T8451C

T8451C Digital Output Module

Trusted TMR 24 Vdc 40-Channel Digital Output Module T8451C

The ICS TRIPLEX T8451C is a triple modular redundancy (TMR) digital output module designed specifically for industrial safety-critical systems. It belongs to the Trusted product line, complies with IEC 61508 standards, and is SIL 3 safety certified. Its core adopts a TMR fault-tolerant architecture, achieving fault isolation and rapid response through triple redundancy circuitry and a majority voting mechanism, ensuring that the system can maintain safe operation even in the event of a single module failure.

Core Technical Specifications

Electrical Performance:

Power Supply Voltage: Backplane power supply 20-32V DC, field power supply 18-32V DC, system power consumption 24W.

Output Capacity: 40 independent channels, divided into 5 groups (8 channels per group), maximum continuous current per channel 2A, total group current limit 8A.

Delay Characteristics: On/off delay 0.5ms, event resolution 1ms.

Protection Functions: Electronic short circuit protection (automatic reset), inter-channel crosstalk suppression (-40dB), output on-state resistance 0.6Ω, off-state leakage current 33Ω.

Redundancy Design:

The TMR architecture achieves fault shielding through triple hardware voting logic, supporting a “first-fault tolerance, second-fault safety” mode.

The module integrates a 6-element voting array to ensure that a single-channel failure does not affect the overall output.

Environmental Adaptability:

Operating Temperature: -5°C to 60°C; Storage Temperature: -25°C to 70°C; Humidity: 5-95% non-condensing.

Protection Level: 2500V DC optocoupler isolation; electromagnetic interference (EMI/RFI) immunity; ESD-sensitive devices require anti-static treatment.

Safety and Diagnostics:

SIL 3 certified; supports power failure/power-on trip configuration; built-in self-diagnostic function (self-test every 2 minutes).

Fail-Safe Design: Automatic isolation in case of channel failure; maintains system output correctness through a TMR voting mechanism.

Functional Features:

High-Density Output: 40-channel dense layout; supports hot-swapping, reducing downtime.

Diagnostics and Monitoring:

Built-in SOE (Event Sequence) recording, 1ms resolution, real-time fault source tracking.

Channel-level status LED indicators; module-level fault alarm; supports remote configuration (via EWS engineering workstation).

Safety Certification: Compliant with IEC 61508 SIL 3, suitable for Safety Instrumented Systems (SIS), supporting “power failure trip” configuration.

Application Scenarios:

Chemical/Petrochemical: Controls reactors, emergency shut-off valves, and pumps; adaptable to high-temperature, high-pressure, and flammable environments.

Power Industry: Generator/turbine start-stop control, boiler safety interlocks, reducing unplanned downtime.

Metallurgy/Steel: Automated production line control, such as rolling mills and conveyor systems, improving production efficiency.

Water Treatment: Pump and valve control, water quality monitoring, optimizing energy consumption and process stability.

Technical Highlights:

TMR Architecture: Triple redundant circuits operate in parallel, eliminating the impact of single-point failures through a majority voting mechanism, improving system availability.

Flexible Configuration: Programmable output voltage range (18-32V DC) to adapt to different load requirements.

High Reliability: Module-level fault isolation, electronic short-circuit protection, wide operating temperature range, meeting the requirements of harsh industrial environments.

Installation and Maintenance

Installation Specifications: Must comply with industrial control cabinet design standards. Pay attention to electromagnetic compatibility (EMC) protection and avoid interference from long cables.

Maintenance Points: Supports hot-swapping; no power interruption is required for maintenance. Regularly check power stability, channel status, and self-diagnostic logs.

Summary: The ICS TRIPLEX T8451C is a digital output module designed for high safety and high reliability requirements. With its TMR redundancy architecture, SIL 3 certification, and adaptability to harsh environments, it is widely used in industrial safety-critical systems to ensure safe operation and rapid recovery capabilities under fault conditions.

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