Manufacturer: ICS Triplex Part number: ICS Triplex T3420A
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T3420A: Product OverviewThe T3420A is a high-density digital output module engineered for integration into the ICS Triplex Trident and Trusted safety instrumented system (SIS) architectures. Occupying a single slot in a standard system chassis, it serves as the primary interface for delivering discrete control signals to field-mounted devices such as solenoid valves, relays, contactors, and indicator lights. Its role is to convert digital commands from the system’s logic solver into precise 24VDC switching outputs, enabling direct actuation of safety-related final elements.The core functionality involves driving 16 independent output channels, each capable of sourcing current to energize field loads. The module continuously monitors each channel for faults—including open circuits, short circuits to ground, and overload conditions—and reports diagnostic status to the logic solver via the chassis backplane. Belonging to the Trident and Trusted product families, platforms defined by fault tolerance and compliance with IEC 61508, the T3420A benefits from a unified system architecture. This integration simplifies validation, enhances diagnostic coverage, and ensures compatibility with other safety-critical components, making it suitable for applications requiring SIL 3 integrity.T3420A: Technical Specifications
ICS Triplex T3420A
Model Number: T3420A
Manufacturer: ICS Triplex
Product Type: 16-Channel Digital Output Module
Number of Channels: 16
Output Type: Sourcing (current sourcing)
Nominal Output Voltage: 24 VDC
Output Voltage Range: 18 VDC to 30 VDC
Maximum Load Current per Channel: 500 mA
Off-State Leakage Current: <0.1 mA
Power Consumption: 2.5 W (from backplane)
Safety Integrity Level: SIL 3 (when integrated into a certified SIS)
Operating Temperature: -40°C to +70°C (-40°F to +158°F)
Dimensions: 31.8 mm x 128.3 mm x 119.9 mm (1.25 in x 5.05 in x 4.72 in)
Weight: Approximately 0.32 kg (0.71 lbs)
Certification: TÜV Rheinland certified
Diagnostic Coverage: Open circuit, short circuit, overload detection
Core Features & Customer ValueHigh-Density Channel Count: Providing 16 output channels in a single slot reduces rack space requirements and minimizes marshalling hardware. For end users, this translates to lower panel costs, simplified cable routing, and reduced documentation complexity—critical advantages in space-constrained installations like offshore platforms or modular skids.Advanced Diagnostic Capabilities: The module performs continuous per-channel diagnostics, detecting open circuits (field wiring faults), short circuits (to ground or supply), and overloads (excessive load current). For maintenance teams, this enables immediate fault localization, reducing mean time to repair by eliminating guesswork during troubleshooting. Early detection also prevents unintended actuator states that could compromise safety.Sourcing Output Design: As a sourcing module, the T3420A supplies current to field devices (e.g., solenoids, relays), a common configuration in industrial control systems. This compatibility simplifies integration with standard field hardware, avoiding the need for additional interfacing components.Seamless Backplane Integration: Communication with the logic solver occurs via the chassis backplane, ensuring deterministic data transfer without external networking overhead. For system integrators, this plug-and-play design streamlines installation and guarantees reliable communication, as the module’s operation is validated as part of the broader Trident/Trusted platform.Flexible Software Configuration: Output behavior (e.g., pulse width, fault response) and diagnostic thresholds are configurable via the system’s engineering software. Engineers can adapt the module to diverse actuator requirements without hardware changes, supporting future upgrades or retrofits with minimal effort.
ICS Triplex T3420A
Typical ApplicationsThe T3420A is employed in safety systems requiring reliable actuation of multiple discrete devices. In an offshore oil production facility, it might drive 16 solenoid valves on an emergency shutdown (ESD) system, where the safety logic uses the module to isolate hydrocarbon lines by closing isolation valves. The high channel count consolidates multiple valve controls into a single module, simplifying rack layout.In a chemical plant’s reactor protection system, the module could control 16 relays that activate emergency cooling systems. If a runaway reaction is detected, the safety logic uses the T3420A to energize the relays, initiating coolant flow. The module’s diagnostics ensure relays receive valid commands, preventing misoperation during critical events.Another application is in a power plant’s turbine control area, where the T3420A interfaces with 16 indicator lights and alarm horns. During a turbine overspeed event, the safety system uses the module to activate visual and audible alarms, with the 16 channels supporting multiple alarm zones. The SIL 3 certification provides assurance of reliability in this high-stakes environment.
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