T8461 | ICS Triplex | TMR 24/48 Vdc Digital Output Module

Product Description

The ICS Triplex T8461 is a fault‑tolerant digital output module designed for use in ICS Triplex Trusted safety systems. Built on Triple Modular Redundancy (TMR) architecture, it provides high‑integrity output control with advanced diagnostics and robust isolation.

Key Features

• System Supply Voltage Range: 20–32 VDC

• Circuit Type: Fully triplicated, fault‑tolerant with optional line monitoring

• Number of Outputs: 40 channels

• Independent Power Groups: 5 groups of 8 outputs each

• Operational Output/Field Voltage Range: 18–60 VDC

• Output Voltage Measurement Range: 0–60 VDC

• Maximum Withstanding Voltage: –1 to 60 VDC

• Output Current Rating:

  • Continuous: 0.75 A per channel

  • 6 A per power group

• Minimum On‑State Load Current: 25 mA

• Output Off‑State Resistance (Leakage): 33 kΩ

• Capacitance Handling:

  • Pre‑release 3.5: 30–55 µF

  • Release 3.5: ≥ 3500 µF at 0.75 A

• Flashing/Pulsing Loads: Release 3.5 recommended

• On‑State Resistance: 0.6 Ω

• Short Circuit Protection: Electronic latching, automatic reset

• Channel Crosstalk: Better than –40 dB

Performance

• Power Consumption:

  • Field supply at 24 V (0.75 A per channel): 18 W

  • System supply at 24 V: 22 W

• Field Common Isolation:

  • Sustained: ±250 VDC

  • Maximum withstand: ±2.5 kVDC

• Output Switching Delay: 0.5 ms (ON/OFF)

• Sample Update Time: 0.5 ms

• Sequence of Events:

  • Event resolution: 1 ms

  • Timestamp accuracy: ±0.5 ms

• Self‑Test Interval: Every 2 minutes

• Intrinsic Safety: Requires external barrier

Environmental Ratings

• Operating Temperature: –5 °C to +60 °C (23 °F to 140 °F)

• Storage Temperature: –25 °C to +70 °C (–13 °F to 158 °F)

• Temperature Change Rate: 0.5 °C/min

• Operating Humidity: 5–95% RH, non‑condensing

• Environmental Specifications: Refer to ICS Triplex Document 552517

Physical Characteristics

• Dimensions:

  • Height: 266 mm (10.5 in)

  • Width: 31 mm (1.2 in)

  • Depth: 303 mm (12 in)

• Weight: 1.285 kg (2.8 lb)

• Shipping Weight: 2 kg

Application Scenarios

The T8461 is ideal for safety‑critical industries such as oil & gas, petrochemical, power generation, and transportation. It is used to drive digital actuators, solenoids, and relays where fault tolerance, fast response, and event logging are essential.

FAQ

Q: How many outputs does the T8461 provide? A: It supports 40 digital outputs, grouped into 5 independent power groups.

Q: What makes this module fault‑tolerant? A: It uses Triple Modular Redundancy (TMR) with electronic short‑circuit protection and line monitoring.

Q: Can it handle pulsing loads? A: Yes, Release 3.5 is recommended for flashing/pulsing current loads.