The ICS Triplex T9851 is a 40-channel TMR Digital Output module for the Trusted safety system. It provides 24V DC control with integrated line monitoring and SIL 3 fault tolerance for critical emergency shutdown and fire and gas applications.
The ICS Triplex T9851 is a high-integrity Digital Output (DO) module designed for the Trusted™ Triple Modular Redundancy (TMR) safety platform. This module serves as the critical interface between the safety processor and field-actuated devices, such as solenoid valves, motor starters, and emergency beacons. Consequently, the T9851 utilizes a 3-2-0 voting architecture, which ensures that a single hardware failure within the module does not compromise the safety function or lead to an unintended process trip.
Furthermore, the T9851 provides comprehensive “line monitoring” capabilities, allowing the system to detect open-circuit and short-circuit conditions in the field wiring even when the output is in the “off” state. Because it employs advanced diagnostic circuitry, it continuously verifies the ability of each channel to switch current. Additionally, the module features integrated secondary means of de-energization. Therefore, if a primary output switch fails to open during a safety demand, the system can still force the output to a safe state, maintaining the highest level of safety integrity.
Moreover, the T9851 is engineered for high-density applications and supports hot-standby redundancy within the Trusted chassis. Due to its robust industrial design, the module effectively handles the high in-rush currents typical of inductive loads without degrading internal components. By integrating this module into a Trusted system, operators benefit from a self-testing hardware layer that significantly reduces the frequency of manual proof-testing while complying with international SIL 3 safety standards.
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