Stock New Original Triconex 3700A Triple Modular Redundant Analog Input Module

Product Details

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FAQs

Q1: What is the primary function of the Triconex 3700A?

It is a 32-channel TMR analog input module that accepts differential voltage signals from field sensors (0–5 VDC), converts them to digital values, and transmits them to the three Tricon Main Processors. The processors use a mid-value selection (MVS) algorithm to determine the true value, ignoring any single channel that provides divergent or faulty readings.

Q2: Can the 3700A directly measure 4–20 mA signals?

No. The module itself measures 0–5 VDC. To measure 4–20 mA, you must use a Triconex termination panel with integrated precision 250 Ω shunt resistors to perform the current-to-voltage conversion.

Q3: Does the 3700A support hot-swap?

Yes. The module supports hot-spare capability, allowing online replacement of a faulty module without system interruption. The "ACTIVE" LED will blink during the synchronization process and remain steady once the module is fully online.

Q4: What is the difference between the 3700 and the 3700A?

The "A" version represents an enhanced hardware revision with improved component reliability and expanded diagnostic capabilities. It is fully backward compatible with the standard 3700 in most applications . The 3700A adds +6% over-range measurement capability (0 to 5.3 VDC) .

Q5: What are the most common installation pitfalls?

Key pitfalls include: (1) Missing or incorrect FTA – the module requires a separate External Termination Panel (ETP) with proper cable interface; (2) Shunt resistor configuration – for 4–20 mA signals, the termination panel must include 250 Ω precision resistors; (3) Chassis keying – each module is mechanically keyed for proper installation; ensure it is seated firmly in the correct slot.