Description
Product Introduction
High-Density TMR Analog Input for Large Safety Systems
The Triconex 3704E is a Triple Modular Redundant (TMR) analog input module. It gives you 64 single-ended input points in one slot. This high density saves space in your Tricon chassis. The module uses three independent channels per input point. A mid-value selection algorithm picks the correct data each scan. The system stays safe even with one or two faulty channels.
Flexible Voltage & Current Support
You can use 0-5V or 0-10V sensors with +6% overrange. For current loops, add an external shunt resistor. Use a 250 Ω shunt for 5V range to measure 0-20mA. Use a 500 Ω shunt for 10V range to measure 0-20mA. This flexibility covers most field transmitters.
Built-In Diagnostics & Fault Tolerance
Each channel runs continuous self-checks. A failed diagnostic activates the Fault indicator on the module. The indicator points to a channel fault, not a module failure. The module keeps working properly with up to two bad channels. Hot-spare support lets you replace a faulty module online.
Technical Specifications (Nested List Format)
Brand & Model Identity
– Triconex (Manufacturer) – 3704E (Product Model) – Type: TMR Analog Input Module – Color Code: Copper
Input Signal Characteristics
– Voltage Ranges – 0 to 5V DC, +6% overrange – 0 to 10V DC, +6% overrange – Current Range – 0 to 20 mA (requires external shunt) – 250 Ω shunt for 5V range – 500 Ω shunt for 10V range
Channel Configuration
– Input Points: 64, single-ended – Isolated Points: No (common reference) – Update Rate: 75 ms for all points
Performance & Accuracy
– Resolution: 12 bits – Accuracy: < 0.25% of Full Scale Range (FSR) – Temperature Range: 0°C to 60°C (32°F to 140°F)
Input Impedance
– Normal Operation: 30 MΩ (DC), minimum – Power-Off Condition: 30 MΩ (DC), typical
Noise Rejection Performance
– Normal Mode Rejection – -1 dB @ 8 Hz – -12 dB @ 60 Hz – -18 dB @ 120 Hz – Common Mode Rejection: Not applicable (single-ended inputs) – Leg-to-Leg Isolation: 200 kΩ, typical
Protection & Durability
– Overrange Protection: 150 VDC / 115 VAC continuous – Module survives accidental high voltage connection
Diagnostic Indicators
– Module Status LEDs – PASS: Normal operation – FAULT: Channel or module issue detected – ACTIVE: Module is online and scanning
Installation & Mechanical
Mounting Requirements
– Fits into any Tricon TMR chassis slot – Mechanically keyed to prevent wrong insertion – Requires a separate External Termination Panel (ETP) – Cable interface connects module to the backplane
Commissioning & Maintenance
Easy Startup Steps
– Insert module into configured chassis slot – Check PASS LED turns on within seconds – Verify field wiring at ETP before power-up
Simple Maintenance
– Hot-spare allows online replacement without shutdown – Fault LED tells you exactly which channel has a problem – No special tools needed for module swap
Compatibility
System Compatibility
– Works with all Tricon main processors – Compatible with standard Tricon ETP families – Use with 24 VDC field power supplies
Partner Product References
– For similar safety I/O needs, see Modicon Quantum series from our partner.
Packaging & Delivery
What’s in the Box
– 1 x Triconex 3704E TMR Analog Input Module – Mechanical keying insert (pre-installed) – No ETP, cable, or shunt resistors included
Warranty Terms
– 12 months warranty from shipment date – Covers manufacturing defects and component failures
Shipping Carriers
– FedEx, UPS, DHL available – Door-to-door delivery with tracking number – Tracking provided within 24 hours of shipment
Typical Applications
Best Uses for 3704E
– Large emergency shutdown systems with many analog inputs – Fire and gas detection panels with 4-20mA sensors – Turbine and compressor monitoring (vibration, temperature) – Pipeline pressure and flow safety monitoring – Any SIL-rated process with 0-10V or 0-20mA transmitters
Professional FAQ (5 Questions)
Q1: Can the 3704E replace a standard 3700 series module?
Yes, but check your point count first. The 3704E gives 64 points. The 3700 gives 32 points. Also note the 3704E uses single-ended inputs, not differential.
Q2: How do I wire a 4-20mA transmitter to this module?
Add an external precision resistor across the input. Use 250 Ω for 0-5V range. Use 500 Ω for 0-10V range. The module then reads voltage proportional to current.
Q3: What happens to data during a hot-spare replacement?
The system continues normal operation. The remaining modules take over. No data loss occurs. The new module syncs automatically after insertion.
Q4 (Experience-based): We see noise on channels near high-power cables. Any fix?
Use shielded twisted-pair wiring. Keep field cables away from power cables. Ground the shield only at the ETP end. The module has basic filtering, but good wiring is critical for single-ended inputs.
Q5 (Selection Guide): Should I buy 3704E or use two 3700 modules?
Pick 3704E if you need 64 points in one slot and have single-ended sensors. Pick two 3700 modules if you need differential inputs or channel isolation. The 3704E saves chassis space but has less noise rejection.
Contact & Order Support
For urgent technical or sales inquiries:
+86 158 8020 0923 (WhatsApp)
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