Manufacturer: ICS Triplex Part number: ICS Triplex T9881
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T9881: Product OverviewThe T9881 is a text-based operator interface terminal designed for integration into the ICS Triplex Trident and Trusted safety instrumented system (SIS) architectures. It serves as a human-machine interface (HMI) module, occupying a single slot within a system chassis. Its primary role is to provide local, direct interaction with the safety system, offering a window into the controller’s status without reliance on a separate supervisory system. This is particularly valuable in situations where immediate, on-site assessment of system health is necessary.The core functionality of the T9881 involves displaying critical information such as alarm messages, system status indicators, and diagnostic data. The module presents this information on a small monochrome LCD screen in a configurable text format. An integrated 16-key membrane keypad allows an operator to acknowledge alarms, navigate through different display screens, and potentially perform pre-defined control actions like resetting a trip. The module communicates with the system’s logic solver via the chassis backplane, ensuring secure and deterministic data exchange. The T9881 belongs to the Trident and Trusted product families, which are engineered for high reliability and fault tolerance in safety-critical applications. The benefit of this platform integration is a seamless, vendor-supported interface that simplifies system validation and provides a consistent look and feel across the control architecture.
ICS TRIPLEX T9432
T9881: Technical Specifications
Model Number: T9881
Manufacturer: ICS Triplex
Product Type: Text Display Operator Terminal
Display Type: Monochrome LCD
Display Resolution: 240 x 64 pixels
Keypad: 16-key membrane keypad
Communication Interface: Serial (RS-232/RS-422)
Power Supply: 5 VDC (via chassis backplane)
Operating Temperature: -20°C to +60°C (-4°F to +140°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 0.4 kg (0.88 lbs)
Safety Integrity Level: SIL 3 (when integrated into a certified SIS)
Certification: TÜV Rheinland certified
Core Features & Customer ValueLocalized Operator Access: The terminal provides a direct and immediate means for an operator to view the status of the safety system at the physical location of the control rack. For the end user, this eliminates the dependency on a remote workstation for basic monitoring tasks, which is critical during a network outage or when quick verification is needed at the panel. This localized access enhances operational awareness and can reduce response time to an incident.Configurable Information Display: The module allows for the creation of multiple display pages, each showing relevant process variables, alarm lists, or diagnostic codes. Engineers can tailor the display to show the most pertinent information for a specific application. The benefit is a user-friendly interface that presents complex data in an organized manner, reducing the cognitive load on the operator and minimizing the chance of misinterpretation.Integrated Alarm Acknowledgment: The keypad includes a dedicated function for acknowledging active alarms. When an alarm occurs, the T9881 displays the message and requires acknowledgment, ensuring that the event has been noted by plant personnel. This feature provides a clear audit trail of operator actions and helps maintain disciplined alarm management practices.Simplified Maintenance Diagnostics: The display can be configured to show detailed diagnostic information from the safety system, such as module faults or communication errors. For the maintenance team, this means being able to quickly identify the source of a problem directly at the rack, often without needing to connect a laptop. This accelerates troubleshooting and reduces mean time to repair.
Typical ApplicationsThe T9881 is implemented in safety systems where a local display of critical information is required. In an offshore oil and gas production facility, it can be mounted in the main control panel for a wellhead control system. An operator can use it to view the status of the emergency shutdown logic and acknowledge alerts without accessing the central control room.In a large chemical plant, the module might be installed in a junction box serving a remote section of a pipeline. Field technicians can use the terminal to check the status of the safety instrumented function protecting that segment, view any active alarms, and perform basic acknowledgments before investigating further.Another application is in a power generation plant’s turbine control area, where the T9881 is used to display the status of the overspeed protection system. The local display provides the control room operator with a redundant view of a critical parameter, enhancing situational awareness during startup and shutdown sequences.
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