3625 | Triconex | 24 VDC Digital Output Module

Overview

The Triconex 3625 modules are designed for critical control applications, particularly where outputs remain in a single state for extended periods—sometimes for years. These Supervised Digital Output (SDO) modules meet the stringent requirements of systems with long-term, stable output states.

Each SDO module receives output signals from the Main Processors across three channels. These signals are processed by a fully fault-tolerant quadruplicated output switch, consisting of power transistors. The result is a single, voted output signal that is passed on to the field termination. This approach ensures that the output signal remains stable and reliable.

Supervised Output Features

The SDO modules are called “supervised” because they offer fault coverage that extends to field issues. In other words, the field circuit is monitored by the module, ensuring the detection of a variety of potential faults, including:

• Loss of power or a blown fuse
• Open or missing load
• A field short that could cause the load to be energized in error
• A shorted load in a de-energized state

The sophisticated online diagnostics and voltage/current loopback circuitry built into each module verify the operation of every output switch, the field circuit, and the presence of a load. This means the SDO module can detect faults without influencing the output signal itself.

If the module fails to detect field voltage on any output point, it triggers the power alarm indicator. Similarly, if it fails to detect the presence of a load, the load alarm indicator activates.

Hot-Spare Support

Another important feature of the SDO modules is their support for hot-spare functionality. This allows for replacement of faulty modules without interrupting system operation. However, the modules require a separate external termination panel (ETP) and a cable interface to connect to the Tricon backplane.

Specifications

• Model Number: 3625
• Nominal Voltage: 24 VDC
• Type: TMR, Supervised/Non-Supervised
• Output Signals: 32, commoned
• Voltage Range: 16-32 VDC
• Maximum Voltage: 36 VDC
• Voltage Drop: < 2.8 VDC @ 1.7A (typical)
• Power Module Load: < 13 watts
• Current Ratings, Maximum:
  • 1.7A per point
  • 7A surge per 10 ms
• Minimum Required Load: 10 mA
• Load Leakage: 4 mA maximum
• Fuses (on Field Termination): N/A—self-protecting
• Point Isolation: 1,500 VDC
• Diagnostic Indicators:
  • On or Off State: 1 per point
  • Module Status: PASS, FAULT, LOAD, ACTIVE
  • Field Alarm: LOAD (1 per point)
  • Color Code: Dark Blue

Additional Notes

Triconex recommends performing compatibility testing before using the Model 3625 module in applications with field wiring lengths greater than 328 feet (100 meters), non-twisted pair cables, or atypical loads, such as smart devices, strobe lights, or klaxons.

Note: The above details are for the Model 3625, but similar considerations apply to the 3623T model. Always verify compatibility before implementation.

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