Overview
Configured for three-channel voted digital output execution in Triconex safety control systems, the Invensys 3604E (7400116-020 TMR Digital Output Module) provides sixteen non-commoned 24 VDC-class output points. The module votes the three channel commands before applying power to each connected load. It supports 22-45 VDC field power and limits continuous output current to 2 A per point.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3604E |
| Spare Model | 7400116-020 |
| Brand | Invensys |
| Product Type | TMR Digital Output Module |
| Power Consumption | Less than 10 W logic power |
| Output Signals | 16 non-commoned digital outputs |
| Operating Voltage Range | 22-45 VDC |
| Continuous Current Limit | 2 A per point maximum |
| Surge Current Limit | 10 A for 10 ms maximum |
| Off-State Load Leakage | 2 mA maximum |
| Field Termination Fuse | One 2.5 A fast-acting fuse per output |
| Point Isolation | 1500 VDC minimum |
| Point Indication | One on/off indicator per output |
| Module Indications | Pass, Fault, Active |
| Field Alarm Indication | Load/Fuse |
| Maximum Diagnostic Toggle Rate | Every 100 ms plus one scan |
| Diagnostic Pulse Duration | 2 ms maximum; 500 microseconds typical |
| Backplane On-State Drop | Less than 3 VDC typical at 500 mA; less than 3 VDC maximum at 2 A |
| Inductive-Load Protection | Reverse diode on the I/O module |
TMR Output and Fail-Safe Execution
The 3604E uses a triple modular redundancy output architecture. Each output command originates from three channels, and the module votes the channel commands before energizing the field load.
The sixteen outputs remain non-commoned, allowing each point to operate as an individual field circuit. Each output has a specified 2 A continuous current limit and a separate 2.5 A fast-acting field fuse requirement.
The module also monitors load and fuse conditions. Pass, Fault, and Active indicators provide module-level status, while individual output indicators show point state.
Point isolation is specified at 1500 VDC minimum. For inductive loads, the module provides reverse-diode protection at the I/O interface.
Frequently Asked Questions
Q: What field voltage can the 3604E accept?
A: The specified operating voltage range is 22-45 VDC.
Q: What output current can each point handle?
A: Each point supports up to 2 A continuous current and up to 10 A surge current for 10 ms.
Q: How does the module execute redundant output commands?
A: The TMR architecture votes the three channel commands before applying power to the connected field load.
Field Installation Guidelines
- Confirm the field supply remains within the specified 22-45 VDC operating range.
- Install one 2.5 A fast-acting fuse for each output point.
- Verify the connected load current does not exceed the 2 A continuous limit.
- Check cable voltage drop before commissioning the final element.
- Keep field wiring separated from high-energy switching circuits where practical.
- Route signal wiring to minimize coupling from high-current or high-frequency conductors.
- Verify output polarity and field termination before energizing the circuit.
- Check the load and fuse diagnostic indications during commissioning.
- Account for the specified diagnostic pulses when connecting loads that may respond to short output transitions.
- For inductive loads, verify compatibility with the module’s integrated reverse-diode protection.
- Do not connect unused output points without confirming the applicable Triconex installation requirements.
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