ICS Triplex T8480 Triple Modular Redundant Analog Output Module

ICS Triplex T8480 Triple Modular Redundant Analog Output Module

The ICS Triplex T8480, also cataloged as the T8480 Analog Output Module, operates as a dedicated hardware component for triplicated 4-20 mA signal generation within the Trusted Safety Instrumented System (SIS). The module executes analog actuator control through TMR processing, isolated field outputs, and diagnostic monitoring.

Hardware Specifications

Parameter	Specification
Model	T8480
Brand	ICS Triplex
Origin	United Kingdom
Weight	1.28 kg
Dimensions	241 mm x 51 mm x 181 mm
Operating Temp	0 deg C to +60 deg C
Power Consumption	22 W system, 28 W field supply
Module Type	Trusted TMR Analogue Output Module
Output Channels	40 independent triplicated analog outputs
Output Range	4-20 mA standard, configurable 0-20 mA
Accuracy	+/-0.1% of span
Linearity	+/-0.2% across operating temperature range
Resolution	16-bit per channel
Load Compliance	Maximum 750 Ohm resistive actuator load
Isolation	2500 VDC impulse withstand between channels, backplane, and field groups
Response Time	20 ms channel update rate
Diagnostics	Open/short circuit detection and over-current protection
Power Supply	20-32 VDC redundant backplane supply, 24 VDC nominal
Form Factor	Trusted chassis-mounted module for T8100/T8300 slots
Hot-Swap Support	SmartSlot technology with companion spare slot compatibility
Certification	IEC 61508 SIL3, TÜV AK6, UL/cUL, CE

Triple Modular Redundant Safety Output Architecture

The T8480 uses a Triple Modular Redundant (TMR) output structure for safety instrumented analog control loops. Three internal output processing paths generate and monitor field current signals, with diagnostic comparison functions used to identify channel deviations and output faults. The module provides galvanic isolation between field output groups, internal electronics, and backplane interfaces. The 4-20 mA output circuits support analog actuator control applications with per-channel monitoring, open circuit detection, and over-current protection.

Fail-Safe Analog Signal Execution and Isolation

The T8480 supports SIL3 safety applications through redundant processing paths and isolated analog output channels. The module monitors output integrity during operation and provides fault information through front panel indicators and system diagnostics. The hot-swap capability uses SmartSlot technology to allow module replacement within compatible Trusted chassis configurations without removing adjacent modules. Installation procedures must follow system maintenance requirements to preserve SIS configuration integrity.

Frequently Asked Questions (FAQ)

Q: How many analog output channels are available on the T8480? A: The T8480 provides 40 analog output channels with triplicated internal processing for TMR safety operation. Q: What output signal type does the T8480 generate? A: The module provides 4-20 mA current outputs as the default configuration and supports configurable 0-20 mA operation. Q: What isolation protection is provided between output circuits and system interfaces? A: The T8480 provides 2500 VDC impulse withstand isolation between channels, backplane interfaces, and field groups.

Field Installation Guidelines

Install the T8480 module only in approved Trusted chassis positions compatible with the T8100/T8300 slot configuration. Confirm chassis power status and module addressing before insertion or removal. Route analog output wiring separately from high-voltage cables, switching circuits, and sources of electromagnetic interference. Use shielded instrumentation cable where required by the site electrical design and terminate cable shields according to the plant grounding standard. Verify actuator loop polarity, current loop continuity, and field device termination before commissioning. Check front panel channel indicators, fault status LEDs, and system diagnostics after installation to confirm correct output operation.