I. Core Parameters (Official Standards)

1. Basic Specifications

Model: DO3401

Channels: 16 channels, common ground type (not point-to-point isolation)

Output Type: 24VDC transistor output (Sink/Source programmable)

Rated Voltage: 24VDC; Operating Range 15–30VDC; Maximum Tolerance 33VDC

Current per channel: 1A continuous; Peak 3A; Total module current ≤ 8A

Conduction Voltage Drop: ≤ 1V @ 1A

Response Time: ≤ 1ms

Architecture: TMR triple redundancy, three-out-of-two voting output

Safety Level: TÜV SIL3 (IEC61508)

Insulation: Field ↔ Backplane 1500VAC; Channels not isolated (common ground)

Diagnosis: Open circuit / short circuit / overload / overvoltage, readback verification, FVD mandatory value

Protection: Each channel current limiting, surge, reverse polarity, overload self-recovery

Hot Swap: Supports online replacement, no system disturbance

Redundancy: Supports dual DO3401 redundancy, automatic master-slave switching

Power Supply: Backplane 24VDC (±10%)

Power Consumption: Approximately 7W

Operating Temperature: -40℃ ~ +70℃

Certifications: CE, UL, CSA, ATEX/IECEx, TÜV SIL3

Installation: Tricon mainframe / expansion frame I/O slots

Matching Terminal Board: 9662-220 (16-channel common ground output terminal board)

Size: 225 × 112 × 40mm

Weight: Approximately 1.5kg

2. Panel Indicators

PWR (green): Module power supply is normal

OK (green): TMR voting is normal, module operation is normal

FAULT (red): Module / channel / diagnostic failure

CH01–CH16 (yellow): Channel output status / failure

3. Main Features

Drive: Electromagnetic valve, relay, contactor, indicator light, alarm horn, small actuator

Load: 24VDC resistive / inductive; NPN/PNP compatible

Configuration: TriStation, configurable fault safety state, output delay, alarm threshold

II. Typical Applications

ESD: Emergency shut-off valve, vent valve, interlock relay

F&G: Sound and light alarm, fire electromagnetic valve, gas shut-off valve

Unit: Compressor / steam turbine interlock electromagnetic valve, anti-surge valve

Process: Safety shut-off valve, discharge valve, on-site alarm light

III. Comparison of Output Modules on the Same Platform (Quick Reference)

DO2401: 16 channels, point-to-point isolation, 2A / channel, SIL3 → Preferred for critical safety loads

DO3401: 16 channels, common ground type, 1A / channel, SIL3 → General safety, cost-effective

DO6603: 32 channels, common ground type, 0.5A / channel, SIL3 → High density, small load