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InquiryICS Triplex T8451 Trusted TMR 24 VDC Digital Output Module
The ICS Triplex T8451 Trusted TMR 24 VDC Digital Output Module, also cataloged as the T8451 output module, operates as a dedicated hardware component for deterministic digital actuation within Trusted triple modular redundancy (TMR) safety instrumented systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | T8451 |
| Brand | ICS Triplex |
| Origin | UK |
| Weight | 1.13 kg (shipping weight 3 kg) |
| Dimensions | 30 cm × 3 cm × 24.1 cm |
| Operating Temp | -5 deg C to 60 deg C |
| Non-operating Temp | -25 deg C to 70 deg C |
| Operating Humidity | 5–95% RH non-condensing |
| Power Consumption | 24 W field supply (1 A per channel), 24 W system supply (24 V) |
| System Supply Voltage Range | 20–32 VDC |
| Operational Output Voltage Range | 18–32 VDC |
| Output Voltage Measurement Range | 0–32 VDC |
| Maximum Withstanding Voltage | -1 to 40 VDC |
| Number of Outputs | 40 channels |
| Independent Power Groups | 5 groups of 8 outputs |
| Output Current Rating | 2 A per channel, limited to 8 A per group |
| Maximum Capacitance | Pre-release 3.5: 30–55 µF |
| Release 3.5 Capacitance | ≥2800 µF at 2 A |
| Minimum On-State Load Current | 50 mA |
| Output Off-State Resistance | 33 ohm |
| Output On-State Resistance | 0.6 ohm |
| Output Short-Circuit Protection | Electronic (latching), automatic |
| Channel Crosstalk | > -40 dB |
| Output Turn-on/off Delay | 0.5 ms |
| Sample Update Time | 0.5 ms |
| SOE Event Resolution | 1 ms |
| SOE Time-Stamp Accuracy | ±0.5 ms |
| Self-Test Interval | 2 minutes |
| Intrinsic Safety | External barrier |
| Isolation | ±250 VDC sustained, ±2.5 kVDC maximum |
Triple Modular Redundancy and Fail-Safe Execution
The T8451 employs a 2oo3 TMR structure, ensuring that each output path is triplicated and independently validated. Galvanic isolation across field commons prevents fault propagation between redundant slices. Electronic latching short-circuit protection enforces fail-safe state execution, while diagnostics run at fixed 2-minute intervals. Crosstalk suppression exceeding -40 dB maintains channel independence under high-density switching.
Frequently Asked Questions
Q: Can the T8451 be replaced while energized? A: Mechanical keying supports correct insertion, but output groups must be de-energized before removal to avoid backplane disturbance.
Q: How does the module behave under high-capacitance loads? A: Release 3.5 supports ≥2800 µF at 2 A, improving stability for flashing or pulsed loads compared to earlier releases.
Q: What is the redundancy switching delay? A: Switching occurs within the system cycle, typically less than the 0.5 ms update time.
Field Installation Guidelines
- Distribute load evenly across the five power groups to avoid exceeding the 8 A group limit.
- Maintain separation between high-current load wiring and low-level signal cables to reduce induced noise.
- Ground shielded cables at a single point to prevent circulating currents.
- Verify external intrinsic safety barriers do not reduce field voltage below the 18 VDC operational threshold.
- Ensure adequate airflow around the module to dissipate 24 W of power consumption.
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