Model Interpretation

3704E: 64-channel non-isolated single-ended AI, software configurable 0–5V/0–10V, enhanced industrial grade variant

Compatibility: Tricon V9~V12 chassis(8110/8111/8112/8115/8116), full hot-swappable

Color Mark: Copper brown front panel(different from yellow 3720/3721)

Core Difference vs 3720: No field isolation, fixed 12-bit resolution, longer 75ms full scan rate, dual voltage range option(0–5V/0–10V)

Technical Parameters

Electrical Spec

Input Mode: 64 channels commoned single-ended, non-galvanic isolation between field and backplane

Signal Range: Software selectable 0~5VDC or 0~10VDC (+6% overrange tolerance)

Resolution: Fixed 12-bit ADC

Full Module Update Rate: 75ms for all 64 channels

Basic Accuracy: <±0.25%FSR at 0~60℃ ambient

DC Input Impedance: Min 30MΩ; typical off-state resistance 30kΩ

Overvoltage Protection: Continuous withstand 150VDC/115VAC surge

Inter-channel isolation resistance: Typical 200kΩ between channels

Backplane power consumption: ≤11.5W @24VDC

Safety & Redundancy

Architecture: 2oo3 triple modular redundancy voting, single circuit fault no loop outage

Certification: IEC61508 SIL3, TÜV, UL, CE, FM certified

Diagnostics: Per-channel open/short/overrange + TMR mismatch continuous diagnosis, fault coverage＞99.9%

SOE timestamp resolution ≤40ms

MTBF ≥135000 operating hours

Mechanical & Environment

Form: Standard single slot 3U Tricon rack module

Dimension(W×H×D):114×30×186mm

Net Weight:≈1.3kg

Front LED Indicator: PASS, FAULT, ACTIVE (no FIELD lamp compared with isolated 3720 series)

Operating Temp:-40℃~+70℃; Storage:-55℃~+85℃

Humidity:5%~95%RH non-condensing

Core Functions

High-density economical analog collection for bulk pressure/temp/flow transmitter voltage signals without strict isolation requirement

Two-range voltage switching via TriStation software to adapt different site transmitter specifications

TMR redundant fault-tolerant acquisition to satisfy SIL3 safety interlock requirement for ESD system

Online hot swap replacement without SIS system stop, fast fault positioning by channel-level self-diagnosis

Lower unit cost per channel for large I/O count SIS expansion project

Applications

Oil&Gas Onshore/Offshore: Bulk wellhead process monitoring, general ESD analog collection without isolation demand

Refinery & Chemical Plant: Mass reactor/tank regular PV monitoring for HIPPS safety interlock

Thermal Power Plant: Boiler auxiliary conventional analog monitoring for unit safety protection

SIS Retrofit: High channel density cost-effective upgrade replacing multiple low-density AI cards

Brief Contrast

3704E(64Ch non-isolate,0~5/10V,75ms)|3720TMR(64Ch isolate,0~5V/4-20mA,10ms)|3721(32Ch isolate differential,±5V,10ms)

Cost-effective dense general AI|Isolated high-speed high-density AI|Isolated differential bipolar precision AI