T8850: Product OverviewThe T8850 is a high-density analog output module designed 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 analog control signals to field-mounted actuators such as control valves, variable speed drives, and damper controllers. Its role is to convert digital commands from the system’s logic solver into precise 4-20mA current signals, which are industry-standard for transmitting analog process control data.The core functionality involves generating and regulating 16 independent current outputs, each programmable within the 4-20mA range. The module continuously monitors each channel for faults, including open circuits, short circuits to supply, and excessive load impedance, and reports diagnostic status to the logic solver via the chassis backplane. Belonging to the Trident and Trusted product families—platforms engineered for fault tolerance and compliance with IEC 61508—the T8850 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.
ICS Triplex T8850
T8850: Technical Specifications
Model Number: T8850
Manufacturer: ICS Triplex
Product Type: 16-Channel Analog Output Module
Number of Channels: 16
Output Type: Current (sourcing)
Output Range: 4-20mA
Load Impedance: 0-600 ohms
Accuracy: ±0.1% of span
Power Consumption: 3 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 0.35 kg (0.77 lbs)
Certification: TÜV Rheinland certified
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. The compact design is particularly advantageous in space-constrained installations like offshore platforms or modular skids.Advanced Diagnostic Capabilities: The module performs continuous per-channel diagnostics, detecting open circuits, short circuits, and load faults. For maintenance teams, this enables immediate fault localization—reducing mean time to repair by eliminating guesswork during troubleshooting. Early fault detection also prevents unintended actuator states that could compromise safety.Precision Signal Regulation: With an accuracy of ±0.1% of span, the module ensures analog signals sent to actuators reflect the logic solver’s intended command. For process control, this precision maintains tight regulation of critical parameters (e.g., flow, pressure), enhancing product quality and reducing waste.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 ranges, filtering, and fault 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 T8850
Typical ApplicationsThe T8850 is employed in safety systems requiring precise analog control of field devices. In an offshore oil production facility, it might drive 16 control valves on a gas dehydration unit, where the safety system adjusts valve positions to maintain hydrate formation temperatures during emergency shutdowns. The high channel count allows consolidation of multiple control loops into a single module, simplifying rack layout.In a chemical plant’s reactor protection system, the module could output 4-20mA signals to variable frequency drives (VFDs) controlling cooling water pumps. If a runaway reaction is detected, the safety logic uses the T8850 to ramp down pump speeds, reducing heat generation. The module’s diagnostics ensure VFDs receive valid commands, preventing misoperation during critical events.Another application is in a power plant’s boiler feedwater control, where the T8850 interfaces with actuators on feedwater regulators. During a low-water condition, the safety system uses the module to close valves and isolate the drum, with the 16 channels supporting multiple boiler zones. The SIL 3 certification provides assurance of reliability in this high-stakes environment.
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