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TRICONEX 0903-164-7921 I/O Module
Product Overview
The TRICONEX 0903-164-7921 is a 16-channel digital input/output module designed for TRICONEX’s Tricon Triple Modular Redundancy (TMR) safety systems, a core platform in industrial automation for safety instrumented systems (SIS). This module serves as a critical interface between field devices—such as proximity sensors, solenoid valves, and emergency stop switches—and the Tricon controller, converting digital signals for monitoring and control in safety-critical processes.
As part of the Tricon TMR architecture, the TRICONEX 0903-164-7921 integrates seamlessly with Tricon racks and processors like the TRICONEX 3008, ensuring redundant signal processing to eliminate single points of failure. It supports 24 V DC signals, a standard in industrial settings, with 8 input channels for detecting sensor states and 8 output channels for triggering actuators (e.g., shutdown valves). The module communicates with the controller via the TMR bus, ensuring real-time data exchange essential for timely safety actions.
Built to withstand harsh industrial environments, the TRICONEX 0903-164-7921 operates in temperatures from -40°C to 70°C and humidity up to 95% (non-condensing). It features channel-to-backplane isolation (250 V AC) to resist electrical noise, ensuring reliable operation near large motors or high-voltage equipment. With SIL 3 certification (IEC 61508), it meets the highest safety standards, making it ideal for oil and gas, chemical, and power generation applications. Though a legacy model, the TRICONEX 0903-164-7921 remains vital for maintaining older Tricon systems, offering compatibility with both legacy and modern field devices to avoid costly upgrades.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 0903-164-7921 |
| Manufacturer | TRICONEX |
| Product Type | 16-Channel Digital I/O Module (Tricon TMR System) |
| Number of Channels | 8 digital inputs, 8 digital outputs |
| Signal Voltage | 24 V DC ±10% |
| Output Current | 1 A per channel, 8 A total |
| Isolation | 250 V AC (channel-to-backplane) |
| Physical Dimensions | 162 mm (L) × 104 mm (W) × 36 mm (D) |
| Weight | 0.7 kg |
| Operating Temperature | -40°C to 70°C |
| Humidity Tolerance | 5%–95% (non-condensing) |
| Safety Integrity Level | SIL 3 (IEC 61508) |
| Mounting Type | Tricon rack mount (compatible with Tricon 3000/4000 racks) |
TRICONEX 0903-164-7921
Related Products
- TRICONEX 3008: The Tricon TMR main processor module that processes signals from the 0903-164-7921 to execute safety logic in emergency shutdown (ESD) systems.
- TRICONEX 3501E: An 8-channel digital input module that complements the 0903-164-7921 in systems requiring additional input capacity for sensors.
- TRICONEX 3604E: A 4-channel digital output module that works with the 0903-164-7921 to control high-power actuators (e.g., large shutdown valves) beyond the 0903-164-7921’s current limits.
- TRICONEX 8111C: A communication module that transmits data from the 0903-164-7921 to SCADA systems, enabling remote monitoring of I/O states.
- TRICONEX 3721: An analog input module whose data is combined with the 0903-164-7921’s digital signals to provide comprehensive process oversight.
- TRICONEX 9662: A power supply module that delivers 24 V DC to the 0903-164-7921 and other Tricon components, ensuring stable operation.
Main features and advantages
16-channel mixed I/O design: The 0903-164-7921 combines 8 digital inputs and 8 digital outputs in one module, reducing the number of modules needed in a system. This saves space in Tricon racks and simplifies wiring—critical for compact control cabinets in offshore platforms or chemical plants.
Triple Modular Redundancy (TMR): The module uses TMR technology, with three independent channels processing each signal. If one channel fails, the other two validate and use the correct data, ensuring no loss of control in safety-critical applications—such as monitoring emergency stop buttons in a refinery, where a missed signal could lead to accidents.
SIL 3 certification: Certified to IEC 61508 SIL 3, the 0903-164-7921 meets the highest safety standards, making it suitable for applications where failure could harm personnel or the environment—such as controlling shutdown valves in a gas pipeline.
Rugged industrial design: Operating in temperatures from -40°C to 70°C and resisting humidity, the module performs reliably in extreme environments—from arctic oil fields to desert solar plants. Its isolation design shields against electrical noise, ensuring accurate signal detection near large motors.
Hot-swappable capability: The 0903-164-7921 can be replaced while the system runs, allowing maintenance without shutting down critical processes. This minimizes downtime in continuous operations like natural gas processing, where unplanned stops are costly.
TRICONEX 0903-164-7921
Installation and maintenance
Pre-installation preparations: Verify the 0903-164-7921 is compatible with your Tricon rack (e.g., Tricon 4000) and power supply (24 V DC ±10%). Power off the system and disconnect all power sources. Align the module with an empty I/O slot in the rack and push until it clicks into the backplane. Connect field devices to the terminal block: input channels to sensors (e.g., limit switches) and output channels to actuators (e.g., solenoid valves). Use shielded cables, grounding the shield to reduce noise. Power on the system and check the module’s status LED—solid green indicates normal operation.
Maintenance suggestions: Inspect the 0903-164-7921 quarterly. Wipe dust from the module with a dry cloth to prevent overheating. Check terminal screws to ensure tight connections—loose wires can cause intermittent signal loss. Use Tricon’s diagnostic software to monitor channel health; if a channel fails, test the connected device first. If the device works, power off the system, remove the 0903-164-7921, and reinsert it to fix backplane connection issues. Store a spare 0903-164-7921 in a dry, cool area (10–30°C) to enable quick replacement during failures, minimizing process interruptions.
Application fields
The TRICONEX 0903-164-7921 is widely used in industries where reliable digital I/O is critical for safety and efficiency:
- Oil and gas: In onshore refineries, it monitors 8 pressure sensors (inputs) and controls 8 shutdown valves (outputs). The TMR design ensures accurate data, triggering valves to close if pressure spikes indicate a leak.
- Chemical processing: In a fertilizer plant, the 0903-164-7921 tracks 8 proximity sensors (inputs) on a conveyor and controls 8 motor starters (outputs). It stops the conveyor if a sensor detects a jam, preventing equipment damage.
- Power generation: In coal-fired plants, it monitors 8 limit switches (inputs) on turbine doors and controls 8 indicator lights (outputs). If a door is open, the module triggers an alarm, ensuring maintenance crews don’t start the turbine prematurely.
- Water treatment: In municipal wastewater plants, the 0903-164-7921 detects 8 float switch states (inputs) and controls 8 pump motors (outputs). It starts pumps when water levels rise, maintaining optimal flow through filtration systems.
TRICONEX 0903-164-7921
Product guarantee
Our company offers a one-year quality warranty service for the 0903-164-7921, covering hardware malfunctions not caused by human factors. During the warranty period, if the product shows abnormal performance or functional failure, we will provide replacement services. In addition, for discontinued models or urgent demands, relying on our global supply chain network, we can quickly respond to customers’ procurement needs for scarce spare parts, and provide reliable services to support the continuous and stable operation of industrial systems.
Our company is a leading enterprise in the industrial control industry, established in 2007, has been 17 years. We are an import and export trade distribution company, mainly selling major brands of industrial control parts, there are many unpopular discontinued models, with a large stock. Our company has the advantage of supply channels, a large number of spot, to meet the needs of customers anxious to find spare parts. Our main PLC module, DCS card, ESD system card, vibration monitoring system card, turbine control system module, gas generator spare parts, instruments and other products distribution trade.
For inquiries, contact us via WhatsApp at +86 18859254943 or email at sales@ygplc.com.
