Manufacturer: ABB Part number: ICS Triplex T8235
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T8235: Product OverviewThe ICS Triplex T8235 is a triple modular redundant (TMR) digital output module designed for high-integrity safety instrumented systems within the Trusted platform. This module functions as the critical interface between the safety controller and field actuators, providing fault-tolerant control of devices such as solenoid valves, motor starters, and alarm annunciators. The module implements a robust architecture where three independent output channels control each field device, with voting logic that ensures correct operation even in the presence of internal component failures.Installed in a Trusted system chassis, the module provides 16 channels of 24V DC digital outputs capable of switching field loads directly. Each output channel incorporates three completely independent switching circuits that operate in parallel. The voting logic compares the commanded state from the three controller partitions and uses a two-out-of-three voting scheme to verify correct operation. If one output channel fails to respond correctly, the remaining two channels maintain the safety function while the system alerts operators to the condition. This architecture ensures that a single component failure in any part of the output circuitry does not prevent the safety system from performing its intended function.As part of the Trusted safety platform, this output module supports the high availability and safety integrity levels required in critical process safety applications. The design includes comprehensive diagnostics that monitor output channel health, detect field wiring faults, and verify that field devices are responding correctly to output commands. The module performs continuous self-tests of the output circuitry, including load verification and fault detection capabilities. This diagnostic coverage, combined with the hardware redundancy, provides the necessary features to achieve Safety Integrity Level (SIL) 3 certification according to IEC 61508 standards.
ICS Triplex T3484
T8235: Technical Specifications
• Model Number: T8235
• Manufacturer: ICS Triplex
• Product Type: TMR Digital Output Module
• Number of Channels: 16 channels
• Output Type: 24V DC solid state
• Output Current: 2A per channel continuous
• Voltage Range: 18-30V DC operating range
• On-State Voltage Drop: <1.5V at 2A
• Off-State Leakage: <1 mA
• Response Time: <1 ms turn-on, <2 ms turn-off
• Overload Protection: Electronic current limiting
• Short Circuit Protection: Yes, with automatic shutdown and restart
• Isolation: 1500V AC channel-to-channel and channel-to-system
• Voting Logic: 2oo3 (two-out-of-three) voting
• Diagnostics: Open circuit detection, short circuit detection, load verification
• Safety Integrity: SIL 3 capable per IEC 61508
• MTBF: >100 years
• Operating Temperature: -40°C to +70°C
• Connection: Removable terminal blocks
• Status Indicators: Per-channel status and fault LEDs
• Power Supply: 24V DC nominal (18-32V DC range)
ICS Triplex T3484
Core Features & Customer ValueTriple Modular Redundant Output Architecture: The TMR design provides three independent switching paths for each output channel, ensuring that a single component failure cannot prevent the safety function from operating. The voting logic continuously monitors all three output circuits and can maintain correct operation even with multiple failures. This architecture is particularly critical for output modules, as they directly control field devices that perform the final safety action. The redundancy ensures that safety functions such as valve closure or equipment shutdown will occur when demanded, even during internal hardware failures.Comprehensive Output Diagnostics: The module includes advanced diagnostics that monitor the health of each output channel and verify proper operation of connected field devices. The system can detect open circuit conditions, short circuits, and excessive load impedance. Additionally, the module can perform periodic proof tests to verify that output circuits are functioning correctly. This diagnostic capability provides early warning of developing issues and supports predictive maintenance strategies, reducing the probability of failure on demand.High-Current Switching Capability: With 2A per channel switching capacity, the module can directly drive many field devices without requiring interposing relays. This reduces system complexity and improves reliability by eliminating additional components. The solid-state switching provides fast response times and long service life compared to electromechanical relays. The electronic current limiting and short circuit protection ensure safe operation even under fault conditions.Typical ApplicationsIn emergency shutdown systems for process industries, the module controls shutdown valves, emergency ventilation dampers, and fire protection system actuators. The TMR architecture ensures that safety actions will be executed when required, even if internal component failures occur. The high current capability allows direct control of solenoid valves without additional relays.For fire and gas protection systems, the module operates alarm annunciators, horn/strobe units, and suppression system releases. The comprehensive diagnostics provide assurance that the output circuits will function when activated. The fast response time ensures rapid system reaction to emergency conditions.In turbine protection systems, the module controls fuel shutoff valves, compressor anti-surge valves, and lubrication system components. The robust design withstands the electrical noise typically present in power generation environments while maintaining reliable operation. The wide operating temperature range ensures performance in both control room and field environments.
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