The Triconex 3626X is a high-performance Digital Output (DO) module designed for use within the Tricon Eagle or Trident safety-instrumented systems. It provides 16 isolated output channels, engineered specifically for critical control applications where fault tolerance and high availability are mandatory. Utilizing Triple Modular Redundancy (TMR) architecture, the module ensures that a single point of failure does not compromise the safety function or process uptime.
Product Parameters
The following table outlines the core technical boundaries and physical characteristics of the 3626X module.
Product Datasheet
Architecture and Redundancy
The 3626X employs a specialized TMR output circuit. Each of the 16 output points is driven by a patented “quad” output circuit, which provides two parallel paths. If one switch fails closed, the other path can still open the circuit; if one fails open, the redundant path maintains the load. This ensures that the module remains functional even in the presence of hardware faults.
Point Supervision
This module features comprehensive point supervision. It continuously monitors the field wiring and the load for:
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Open Circuits: Detects if the field wire is disconnected or the load is missing.
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Short Circuits: Protects the module and field devices from over-current conditions.
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Field Power Loss: Monitors the presence of external 24 VDC field power.
Hot-Swappable Capability
The 3626X is designed for “Hot Repair.” It can be replaced while the system is online without interrupting the process. When a replacement module is inserted into the chassis, it automatically synchronizes its state with the active controllers.
Product Details
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Country of Origin: United States (USA)
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Manufacturer: Schneider Electric (Triconex brand)
Technical Description
The module converts logic commands from the main processors into high-current electrical signals to drive field devices such as solenoid valves, relays, and motor starters. Internal microprocessors manage the communication with the system backplane and execute sophisticated self-diagnostics.
Every millisecond, the module performs a “forced-switch” test. These tests are fast enough that they do not affect the state of the field actuators but allow the module to verify that every transistor in the voting circuit is capable of changing state.
Common Questions & Answers (Q&A)
Q: Can the 3626X be used for safety-critical “De-energize to Trip” applications? A: Yes. The module is TIV (TÜV) certified for use in safety-related applications up to SIL 3. Its default safe state is to de-energize the output upon a total loss of power or internal failure.
Q: What happens if a short circuit occurs in the field? A: The module detects the over-current condition and shuts down the affected channel to prevent damage. A diagnostic alarm is triggered in the system software to alert maintenance personnel.
Q: Is external fusing required for each point? A: While the module includes internal electronic protection, external fusing is often recommended according to local electrical codes and to provide a physical disconnect for maintenance.
Q: Does the module require a specific termination assembly? A: Yes, the 3626X must be paired with a compatible Triconex External Termination Assembly (ETA) and interface cable to connect to field wiring.
