T8471 | ICS Triplex Trusted TMR 120 Vdc Digital Output Module

Product Overview

The T8471 Trusted® TMR 120 Vdc Digital Output Module interfaces with 32 field devices. Triplicated diagnostic tests are performed throughout the module, including measurements for current and voltage on each portion of the voted output channel. Tests are also conducted for stuck-on and stuck-off failures.

Fault tolerance is achieved through a Triple Modular Redundant (TMR) architecture within the module for each of the 32 output channels. Automatic line monitoring enables the module to detect both open circuit and short circuit failures in field wiring and load devices.

The module features on-board Sequence of Events (SOE) reporting with a 1 ms resolution. An output change of state triggers an SOE entry, and output states are automatically determined by voltage and current measurements on-board the module.

Key Features of T8471

32 Triple Modular Redundant (TMR) output channels per module.
Comprehensive, automatic diagnostics and self-test.
Automatic line monitoring per channel to detect open and short circuits in field wiring and load faults.
2500 V impulse withstand opto/galvanic isolation barrier.
Automatic over-current protection (per channel), no fuses required.
On-board Sequence of Events (SOE) reporting with 1 ms resolution.
Hot-swappable module replacement using a dedicated companion (adjacent module).
Front panel LEDs for output status and field wiring faults.
Module status LEDs indicate module health and operational modes (Active, Standby, Educated).
TÜV Certified IEC 61508 SIL 3 compliance.
Outputs are powered in isolated groups of eight.

Specifications of T8471

Power & Circuit Details

System Supply Voltage Range: 20 Vdc to 32 Vdc
Circuit Type: Fault-tolerant, fully triplicated with optional line monitoring
Number of Outputs: 32 Channels
Independent Power Groups: 4 groups (each containing 8 outputs)

Voltage & Current Ratings

Operational Output/Field Voltage Range:
- 35 Vdc to 130 Vdc (Pre Build Revision J35)
- 35 Vdc to 150 Vdc (Build Revision J35 and later)
- Note: Voltages below ~35 V will switch properly but may not be reported correctly, possibly affecting line monitoring.
Output Voltage Measurement Range: 150 Vdc
Maximum Withstanding Voltage: 200 Vdc
Output Current Rating:
- Per Power Group (Continuous): 2 A
- Per Channel (Continuous): 0.5 A
Minimum On-State Load Current: 20 mA
Output Off-State Resistance (Effective Leakage): 330 kΩ
Output On-State Resistance: 0.8 Ω
Output Short Circuit Protection: Electronic (Latching)

Load Capacitance

Pre-release 3.5: 30 µF – 55 µF
Release 3.5: At least 3600 µF at 0.5 A
Flashing/Pulsing Current Loads: Release 3.5 recommended

Power Consumption

Field Supply (1 A per channel): 24 W
System Supply (24 V): 24 W

Isolation Ratings

Power Group to Power Group: 150 V Reinforced (Continuous)
- Type tested at 2436 Vdc for 60 seconds
Field Common: 150 V Reinforced (Continuous)
Channel to Channel (Within Power Group): 250 V Basic (Fault)
- Type tested at 2467 Vdc for 60 seconds

Performance & Timing

Output Turn-on/Off Delay: 5 ms
Sample Update Time: 0.5 ms
Sequence of Events (SOE) Resolution: 1 ms
Time-stamp Accuracy: ±0.5 ms
Self-Test Interval: 5 minutes

Environmental Specifications

Operating Temperature: 0 °C to +60 °C (+32 °F to +140 °F)
Non-Operating Temperature: -25 °C to +70 °C (-13 °F to +158 °F)
Temperature Change Rate: ±0.5 °C/min
Relative Humidity (Operating, Storage & Transport): 10% – 95%, non-condensing

Dimensions & Weight

Height: 266 mm (10.5 in)
Width: 31 mm (1.2 in)
Depth: 303 mm (12 in)
Weight: 1.342 kg (3 lb)

Notes

150 Vrms secondary circuit derived from mains, OVC II up to 300V.
250 Vrms mains circuit, OVC II up to 300V. Exposure to these voltage levels must be temporarily constrained in line with the system MTTR.

Contact Us

Phone: +86-15915488782
Email: uma@meloauto.com
WhatsApp: +8615915488782
Business Hours: 24/7 service
Address: Unit 601, Powerlong International Center, No. 1599 Luling Road, Siming District, Xiamen City, Fujian, China

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