Description
The TRICONEX 3625 is a high-reliability digital output module designed for use in Safety Instrumented Systems (SIS) utilizing Triple Modular Redundant (TMR) architecture. This TRICONEX 3625 module provides 32 isolated output points, each featuring an internal voting mechanism that ensures a single hardware failure does not result in a system trip or a failure to perform. It is engineered specifically for critical control applications—such as Emergency Shutdown (ESD) and Fire and Gas (F&G) systems—where maximum availability and fault tolerance are mandatory for operational safety.
Technical Specifications
- Model Number: 3625
- Module Type: TMR Digital Output (DO)
- Number of Points: 32, non-commoned (isolated)
- Nominal Voltage: 24 VDC
- Voltage Range: 18–30 VDC
- Output Current: Max 2.0A per point / 20A per module
- Point Isolation: 1500 VDC
- Self-Test Interval: Automatic continuous background diagnostics
- Hot-Swappable: Yes
- On-state Voltage Drop: < 1.5 VDC The module incorporates comprehensive “Output Voter” diagnostics, which continuously monitor the health of the output switches and the integrity of the load, allowing the system to identify and report latent faults before they impact process safety.
TRICONEX 3625
TRICONEX 3625
TRICONEX 3625
TRICONEX 3625
Model Comparison
The TRICONEX 3625 is distinguished from the 3623 or 3624 series by its specific power ratings and isolation characteristics. While the 3625 is designed for 24 VDC loads with high current capacity per point, the 3601 series typically handles different voltage thresholds or common-ground configurations. Unlike “simplex” digital output modules found in standard PLCs, the 3625 uses three independent sub-circuits for every single output point, providing a level of reliability (SIL 3) that standard industrial hardware cannot achieve.
Operational Tips
- External Power: Ensure that the external 24 VDC field power supply is appropriately sized; while the module handles the logic, the field load current must be supported by a stable, industrial-grade power source.
- Hot-Spare Slot: For maximum uptime, utilize a “Hot-Spare” slot in the Tricon chassis; if the active 3625 fails, the system will automatically transition to the spare module without interrupting the process.
- Load Requirements: Verify that the minimum load current is met; TMR modules perform periodic “glitch tests” for diagnostics, and extremely high-impedance loads may occasionally trigger false open-circuit alarms.
- Keying: Use the mechanical keying pins on the backplane to ensure that only a 24V Digital Output module can be inserted into the designated slot, preventing accidental damage from mismatched voltages.
