Invensys Triconex 3625 Digital 24VDC Output Modules

Introduction Supervised Digital Output (SDO) modules are designed for critical control programs where outputs may remain in a single state for extended periods. These modules receive output signals from the Main Processors across three channels, which are then voted on by a fault-tolerant quadruplicated output switch. This switch passes a single voted output signal to the field termination.

SDO modules incorporate voltage and current loopback circuitry with online diagnostics to verify the operation of each output switch, the field circuit, and the presence of a load, ensuring complete fault coverage without influencing the output signal. They detect various field faults, including power loss, open or missing loads, field shorts, and shorted loads in the de-energized state. Fault detection triggers appropriate alarms, and these modules support hot-spare capability. An external termination panel (ETP) is required for these modules.

Module Specifications

Model Numbers: 3625

Nominal Voltage:

• 24 VDC

Type: TMR, Supervised/Non-Supervised DO

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, ACTIVE
• Field Alarm: POWER, LOAD (1 per point)

Color Code:

• Dark blue

Weight: 4.7 to 6.0 lbs. (2.1 kg. to 2.7 kg.)

Conclusion Supervised Digital Output Modules provide robust and reliable output control for critical systems, featuring comprehensive fault detection and diagnostic capabilities. They support hot-spare functionality and are designed to handle extended periods of output stability, making them suitable for demanding industrial applications.