Description
Product Parameters
- Model Number: 3503E
- System Compatibility: Tricon High-Density (HD) Systems
- Type: Digital Input Module (TMR – Triple Modular Redundant)
- Input Channels: 32, non-isolated
- Voltage Rating: 24 VDC (Nominal)
- Input Range: 15–30 VDC
- Input Delay: < 4 ms (typical)
- Point Isolation: Group isolation only (Individual points are common)
- Status Indicators: Pass, Fault, Active, Load, and individual Point LEDs
Product Description The Triconex 3503E is a 32-point Digital Input module designed for use in Triple Modular Redundant (TMR) safety-instrumented systems. It is an “Enhanced” (E) version of the standard 3503 module, offering improved diagnostic capabilities and faster response times. The core of its design is the TMR architecture: each input signal is split into three separate paths and sent to three independent processors. This ensures that a single point of failure—whether a component on the board or a processor—will not cause a trip or a failure to trip. The 3503E continuously performs self-testing to detect “stuck-at” faults and field-side wiring issues, making it suitable for the most demanding safety applications.
Application Areas This module is a cornerstone of Emergency Shutdown (ESD) systems and Fire and Gas (F&G) detection units. It is widely used in global oil refineries, offshore platforms, and chemical processing plants to monitor status signals from field devices such as pushbuttons, pressure switches, and limit switches where high availability and SIL3 compliance are mandatory.
Product Specifications
- Weight: 2.1 kg
- Dimensions: 420 mm x 300 mm x 45 mm
- Country of Origin: USA (Schneider Electric/Invensys)
- Power Consumption: < 10 Watts
- Operating Temperature: 0°C to 60°C
Operational Precautions
- TMR Integrity: To maintain the safety rating of the system, do not bypass the voting logic in the TriStation 1131 software unless performing supervised maintenance.
- Field Power: The module does not provide power to the field contacts. Ensure a stable, filtered 24 VDC external power source is provided for the input loops.
- Module Insertion: Use the module’s ejector levers to ensure the backplane connectors are fully seated. Partial contact can lead to “I/O Fault” alarms in the diagnostic logger.
- Testing: Periodic “Proof Testing” is required according to your facility’s Safety Requirements Specification (SRS) to ensure the 2-out-of-3 voting circuitry is functioning at peak reliability.
Recommended Similar Product Models
| Model Number | Product Category | Feature Set |
|---|---|---|
| 3501E | Digital Input | 115V AC/DC TMR Input |
| 3502E | Digital Input | 48V DC TMR Input |
| 3604E | Digital Output | 24V DC TMR Output (Commoned) |
| 3700 | Analog Input | 0-5V DC TMR Input |
| 3805E | Analog Output | 4-20mA TMR Output |
