3720

Product Overview

The 3720 is a Triple Modular Redundant (TMR) Analog Input Module for Triconex safety systems, providing 64 single‑ended input channels with channel isolation.

General Specifications

• Type: TMR Analog Input Module
• Voltage: 0‑5V DC, +6%
• Number of Input Channels: 64, single‑ended
• Channel Isolation: Yes
• Color Code: Yellow

Input Specifications

• Input Update Rate: 10 ms
• Resolution: 12 bits or 14 bits (programmable)
• Accuracy: < 0.15% FSR (0°C to 60°C)
• Input Resistance (Load): 10 MΩ (DC), min.
• Power‑Off Resistance: 140 kΩ (DC), typical
• Leg‑to‑Leg Isolation: 420 kΩ, typical

Normal Mode Rejection

• @ 8 Hz: –3 dB
• @ 60 Hz: –17 dB
• @ 120 Hz: –23 dB

Protection & Current Range

• Input Overvoltage Protection: 150 V DC / 115 V AC continuous
• Current Range: 0‑20 mA (+6% overrange), external 250Ω shunt required

Diagnostic Indicators

• Module Status: PASS, FAULT, ACTIVE, FIELD

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