ICS Triplex T9803 – Trusted TMR Safety System Module for High-Integrity Control

The ICS Triplex T9803 sits within the Trusted triple modular redundancy (TMR) platform, designed for SIL3 safety and high-availability control in industries where downtime just isn’t an option. From my experience, it’s chosen for safety instrumented systems on process lines, burner management, and turbine or compressor protection—anywhere you want deterministic behavior and diagnostics that flag issues before they snowball. You might notice that the T9803 follows the robust, hot-swappable module format common to the Trusted family, so maintenance is usually fast and low-risk during live operation.

Key Features

• TMR architecture – Triple voting logic helps the system tolerate single faults without process interruption.
• SIL3-ready platform – Typically deployed in IEC 61508/IEC 61511 safety instrumented functions across oil & gas, chemicals, power, and utilities.
• Hot-swap serviceability – The Trusted form factor supports online replacement in most cases, reducing mean time to repair.
• Continuous diagnostics – Extensive self-checking and fault annunciation on the backplane for predictive maintenance.
• Robust environmental design – Conformal coating and industrial temperature range suited to cabinet-mounted process environments.
• Deterministic communications – High-integrity Trusted backplane interface keeps signal paths simple and highly reliable.
• Lifecycle stability – Long-supported platform; spare parts strategies are straightforward for brownfield upgrades.

Related or Supporting Products

• Trusted Controller (e.g., T8110-series) – Main CPU for logic execution and safety voting.
• Trusted Power Supply (e.g., T8151-series) – Redundant PSU options for high-availability power to the backplane.
• Trusted Digital I/O (e.g., T84xx series) – 24 VDC DI/DO modules commonly paired with process safety interlocks.
• Trusted Analog I/O (e.g., T86xx series) – 4–20 mA / HART-capable options in many installations.
• Termination Assemblies (TA) – Field wiring interfaces matched to the specific I/O module variant for clean cabinet builds.

If you’re upgrading or replacing an installed base, we can help cross-check the T9803 against your existing chassis and TA part numbers. One thing I appreciate is how consistent the Trusted form factor is—swap-outs tend to be straightforward when the revision and TA are correctly matched.

Installation & Maintenance

• Cabinet & environment: Mount the Trusted chassis in a clean, ventilated cabinet (typically 19″ rack or panel enclosure). Keep ambient within the stated temperature range and allow front/rear clearance for airflow.
• Power & grounding: Use clean 24 VDC with proper bonding to a low-impedance earth. Segregate safety I/O cabling from noisy drives where possible.
• Wiring: Field connections should land on the matched termination assembly; use shielded twisted pairs for analog/sensitive signals and tie shields at one end to avoid ground loops.
• Hot-swap procedure: In most cases, the module can be replaced online. Follow site MOC and the Trusted maintenance guide to avoid compromising voting or bypass conditions.
• Routine checks: Visual inspection for connector wear, clean dust from vents, verify diagnostics in the engineering workstation, and confirm proof-test intervals per your SIL justification.
• Firmware & records: Keep firmware revisions aligned across redundant modules. Log serials and revisions; it seems to make audits much smoother.

A maintenance lead from a refinery told us their team swapped a Trusted I/O module in under 15 minutes during a scheduled window—no nuisance trips, thanks to the TMR design and clear fault annunciation. That’s typically how these systems are meant to behave in the field.

Quality & Certifications

• Designed for use in IEC 61508 SIL3 safety applications (system dependent)
• CE compliant; UL/CSA listings typically available for Trusted hardware
• Manufactured under ISO 9001 quality systems; RoHS compliance by revision
• Standard warranty: 365 days