TRICONEX 3623 / 3623T is a 16-channel, 120 VDC TMR triple modular redundant supervised digital output module designed exclusively for the Tricon safety control system.It is specially engineered for safety-critical applications up to SIL 2–3, including ESD emergency shutdown, burner management, fire and gas systems, and critical valve control.Its core value lies in providing full-link online supervision of output switching, field circuits and load status in applications where outputs maintain a single state for long periods (years without change), without disturbing the output signal.
It can detect critical faults such as wire breakage, power loss, fuse failure, load loss, false energization and short circuits.
Featuring quad voting outputs and a TMR architecture, it complies with international safety standards including IEC 61508, DIN V 19250 and NFPA, serving as a highly reliable safety output component with high diagnostic coverage.
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Technical Specifications
| Item | Details |
|---|---|
| Model | 3623 / 3623T (3623T with enhanced insulation) |
| Type | TMR Supervised Digital Output (SDO) |
| Output Points | 16 channels, common ground grouped |
| Rated Voltage | 120 VDC |
| Voltage Range | 90–150 VDC |
| Maximum Withstand Voltage | 160 VDC |
| Rated Current | 0.8 A per channel; peak 4 A for 10 ms |
| Minimum Load | 30 mA |
| Voltage Drop | Typically < 1.5 VDC |
| Channel Isolation | 1500 VDC (2500 VDC for 3623T) |
| Load Leakage Current | Max. 4 mA |
| Fuse | 1 A fast-acting fuse on external terminal block |
| System Power Consumption | < 10 W |
| Operating Environment | 0–60 ℃, 5%–95% RH non-condensing |
Features and Benefits
- TMR Triple Modular Redundancy + Quad Voting OutputThree independent channels receive commands from the main processor and perform 2-out-of-3 voting via quad power switch circuits. Single-point faults do not affect output, and multi-point faults allow fault-tolerant operation.
- Full-Link Supervision and Diagnostics (Non-Disruptive)Voltage and current loop monitoring provides real-time detection of:
- Field power loss / fuse blown
- Load open circuit / missing load
- False energization caused by load short circuit
- Load short circuit under power-off condition
- Online Diagnostics and Status IndicatorsThe front panel provides PASS/FAULT/ACTIVE indicators. Each channel features output, power and load alarms for precise fault location down to the channel and point level.
- Hot-Swap CapabilitySupports online replacement without interrupting system operation or safety output, suitable for continuous production environments.
- Mechanical KeyingSlot mechanical keying prevents hardware damage caused by incorrect insertion.
- Long-Life Stable OutputOptimized for safety loops that maintain a fixed output state long-term, eliminating issues such as contact aging, sticking and undetected leakage.
Features and Benefits
- TMR Triple Modular Redundancy + Quad Voting OutputThree independent channels receive commands from the main processor and perform 2-out-of-3 voting via quad power switch circuits. Single-point faults do not affect output, and multi-point faults allow fault-tolerant operation.
- Full-Link Supervision and Diagnostics (Non-Disruptive)Voltage and current loop monitoring provides real-time detection of:
- Field power loss / fuse blown
- Load open circuit / missing load
- False energization caused by load short circuit
- Load short circuit under power-off condition
- Online Diagnostics and Status IndicatorsThe front panel provides PASS/FAULT/ACTIVE indicators. Each channel features output, power and load alarms for precise fault location down to the channel and point level.
- Hot-Swap CapabilitySupports online replacement without interrupting system operation or safety output, suitable for continuous production environments.
- Mechanical KeyingSlot mechanical keying prevents hardware damage caused by incorrect insertion.
- Long-Life Stable OutputOptimized for safety loops that maintain a fixed output state long-term, eliminating issues such as contact aging, sticking and undetected leakage.
Installation Specifications
- Installation PrerequisitesThe system shall be in RUN/REMOTE mode with normal rack power supply and reliable grounding.Ensure the slot is an I/O slot and the mechanical keying matches the 3623 module.The module must be used with a dedicated External Terminal Panel (ETP); direct wiring is not supported.
- Installation ProcedurePower off the system or keep it in hot-swap status, then remove the slot cover.Slide the 3623 module smoothly along the guide rails to ensure full engagement with the backplane connector.Tighten the panel mounting screws.Connect the terminal panel and field cables, with strict routing by common-ground groups to avoid strong electrical interference.After power-on, verify normal status: steady PASS LED, lit ACTIVE LED, and no FAULT indication.
- Wiring GuidelinesConnect field power to the common terminals of the terminal panel, with a 1 A fast-acting fuse for each channel.Recommended cable: 12–24 AWG, with shield grounded at one end.The 3623T is intended for applications such as cables longer than 100 m, non-twisted pair wiring, smart devices, and audible/visual loads. Compatibility verification must be performed before use.
Frequently Asked Questions (Q&A)
Q1: What is the difference between the 3623 and standard 120 VDC output modules such as the 3603E?A: The 3623 is a supervised digital output (SDO) module with full-link diagnostics for field circuits, capable of detecting wire breaks, power loss, and load abnormalities. The 3603E is a standard unsupervised module that only diagnoses internal faults and does not cover field failures. The 3623 is used for safety final elements, while the 3603E is for general control loops.
Q2: How to choose between 3623 and 3623T?A: Use the 3623 for normal operating conditions. Select the 3623T and perform compatibility testing for applications with cable lengths over 100 m, non-twisted pair wiring, or driving special loads such as smart instruments, strobe lights, and alarms.
Q3: Does the module support hot-swapping? Will it affect safety outputs?A: Hot-swapping is supported. During replacement, the other two channels maintain voting output to avoid spurious operation or shutdown. Status is automatically synchronized after replacement.
Q4: What does a minimum load of 30 mA mean? What happens if this requirement is not met?A: It is the minimum load current required to ensure reliable detection by the supervision circuit. If the load current is below 30 mA, a false LOAD alarm will occur. A shunt resistor should be connected in parallel, or a module supporting lower loads should be used instead.
Q5: What safety applications is the 3623 suitable for?A: SIL 2–3 safety loops that maintain long-term states and require immediate fault detection, including emergency shutdown valves, isolation valves, burner fuel valves, fire & gas system actuators, and critical interlock outputs.
Q6: Must Triconex original terminal boards be used?A: Original ETP is strongly recommended, as it includes fuses, indicators, proper wiring, and insulation coordination. Third-party terminal boards will lose supervision and certification compliance, introducing safety risks.
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