Product Description

Overview

The ICS Triplex T8480 is a high-integrity Trusted TMR Analog Output Module designed for critical safety and control applications. It provides 40 isolated analog output channels, typically 4–20 mA, for devices such as valve actuators, positioners, and other field instruments. With a Triple Modular Redundant (TMR) architecture, every output path is triplicated, ensuring continuous operation even in the event of a component failure.

Key Features & Benefits

Safety and Reliability

• SIL 3 Certified: Compliant with IEC 61508 for high-integrity safety loops

• Triple Modular Redundant Architecture: Uses internal 2-out-of-3 voting logic to maintain correct outputs even if one internal path fails

• Hot-Swappable: Supports SmartSlot and companion-slot configurations for online replacement without halting operations

High-Density Output Channels

• 40 Channels per Module: Maximizes channel density to reduce the number of modules required in large-scale systems

• Power Grouping: Channels divided into 5 isolated power groups (8 channels each) to prevent cascading faults

Advanced Diagnostics and Monitoring

• Line Monitoring: Detects open-circuit and short-circuit conditions for each output point

• Self-Diagnostics: Continuously tests for “stuck-on” or “stuck-off” output states

• Front Panel LEDs: Indicate per-channel output status and module health for quick visual troubleshooting

Precision Control

• High Accuracy: ±0.1% of span ensures reliable control over critical devices

• Fast Update Rate: Typical loop update time of 20 ms supports responsive safety and process control

Module Architecture

Field Termination Unit (FTU)

• Connects all three Field Interface Units (FIUs) to the field wiring

• Includes fail-safe switches, over-voltage protection, and EMI/RFI filtering

• Supports SmartSlot coordination for seamless active-standby module replacement

Field Interface Unit (FIU)

• Contains output switch circuits and sigma-delta (ΣΔ) converters for each channel

• Measures on-board supply voltage and other housekeeping signals for enhanced diagnostics

• Isolated 6.25 Mbit/sec serial link to HIU slice for fault-tolerant communication

Host Interface Unit (HIU)

• Interfaces with the Inter-Module Bus (IMB) for power and data

• Three independent slices (A, B, C) maintain fault containment

• Provides local processing, data reduction, and module diagnostics

• Redundant 24 Vdc power distribution with isolated output supply to FIUs

Technical Specifications

Applications

• Emergency Shutdown (ESD) systems

• Fire & Gas (F&G) safety loops

• Valve and actuator control in high-integrity process systems

• Safety-critical industrial automation requiring continuous monitoring

FAQ

Q: Can the T8480 module be replaced while online?
A: Yes, using SmartSlot or companion-slot configurations, modules can be hot-swapped without stopping operations.

Q: How does the module handle field wiring faults?
A: Each output point includes automatic line monitoring for open-circuit and short-circuit detection.

Q: What is the advantage of TMR architecture?
A: Triple Modular Redundancy ensures that the failure of a single slice does not compromise the output, maintaining system safety.