2. Model Definition

51304672: Base model for 16-channel non-isolated non-HART analog input FTA

-100: Standard baseline PCB grade

Basic full-board moisture & dust resistant conformal coating for dry clean cabinet environments

Standard bidirectional TVS transient, ESD surge protection per channel (no channel isolation)

Single-stage RC low-pass EMI filter for low-noise single-ground control room applications

Common ground bus design across all 16 channels, no independent galvanic isolation barriers

Standard capacity loop current limiting resistors for short-circuit overload protection of transmitters and IOP inputs

Basic plastic partition baffles to reduce mild inter-channel analog signal crosstalk

3. Technical Specifications

Channel Count: 16 shared-ground channels, no per-channel galvanic isolation

Compatible Field Devices

Two-wire non-HART 4–20mA transmitters: pressure, differential pressure, flow, level, RTD/TC temperature, pH, ORP, dissolved oxygen, conductivity analytical transmitters

FTA Structure: Passive non-isolated termination board without built-in power supply; integrated single-stage filtering, standard surge protection and short-circuit current limiting

PCB Protection: Basic standard conformal coating; flammability UL94 V0

Terminal Type: Compression screw terminals compatible with solid/stranded copper wire up to 14 AWG; each channel has Ch+ / Loop– terminals sharing a unified ground bus

Form Factor: Standard B-size footprint, snap-on DIN rail mounting for standard 35 mm rails

Operating Ambient: 0℃ ~ +60℃ clean indoor cabinet; only suitable for dry, low-dust, non-corrosive single-ground layouts; unsuitable for multi-ground sites, salt fog or chemical fume atmospheres

Circuit Architecture Parameters

Single-stage low-pass filtering to attenuate minor ambient electromagnetic interference

Standard bidirectional TVS suppresses positive/negative transient high voltage on each input loop

Common ground structure; ground potential differences between field and DCS will cause measurement drift

Calibrated standard-tolerance current-limit resistors prevent transmitter burnout and IOP input damage during field short faults

Basic partition baffles minimize slight inter-channel analog bleed and cross-measurement interference

Redundancy Support: Fully compatible with primary/standby redundant non-isolated non-HART AI IOP; hot-swap FTA replacement without shutdown permitted

Approximate Unit Weight: 0.356 kg

4. Interface & Communication Configuration

Inner IOP Connection: Locking flat ribbon cable directly mates to non-isolated non-HART AI IOP pin headers. Standard cable strain relief prevents pin header deformation under routine wiring harness tension.

Field Outer Terminals: 16 groups of Ch+ / Loop– terminals with a shared common ground bus across all channels; field excitation circuit shares DCS control ground potential.

Signal Mechanism: Pure DC 4–20mA analog measurement signals; no HART coupling circuitry integrated.

No auxiliary communication ports; only analog process signal transmission is supported.

5. Core Functions

Common-ground signal routing: Simple cost-effective wiring for single-ground plant control rooms.

Single-stage basic EMI noise rejection: Reduces minor measurement jitter in low-noise clean cabinet environments.

Standard surge & short-circuit protection: Shields IOP high-impedance inputs and field transmitters from low-magnitude wiring transients and short-circuit overload.

Uniform loop overload protection: Matched current limiting resistors deliver consistent short-circuit protection for all connected transmitters.

Consistent input linearity: Balanced passive components ensure uniform measurement response across all 16 channels for easy calibration.

Redundant hot maintenance: Seamlessly follows primary/standby IOP switching; single-channel disconnection does not affect remaining 15 measurement loops.

6. Application Scenarios

Applicable Industries

Light manufacturing, municipal clean water treatment, low-noise auxiliary petrochemical facilities, standard low-humidity pharmaceutical batch production

Typical Measurement Loops

General pressure and differential pressure monitoring transmitters

Conventional flow rate measurement transmitters

Atmospheric tank level monitoring transmitters

Standard RTD/TC temperature measurement transmitters

Clean water pH and conductivity analytical transmitters

Only applicable to single-ground control room layouts, low-VFD low-noise process areas, dry dust-free cabinet atmospheres. Not usable for multi-ground sites, high-humidity, dusty, corrosive or salt-fog cabinet environments.

7. Wiring Standards

Two-wire transmitter wiring: Transmitter positive → FTA Ch+, transmitter negative → FTA Loop– (common ground bus); reversed polarity creates obvious measurement offset.

Cable selection: Shielded twisted-pair instrument cable for all field runs; shield grounded once at DCS cabinet FTA side.

Power cable separation: Maintain physical separation between analog instrument cables and high-voltage AC power wiring to reduce EMI coupling.

8. Incompatible Hardware

All isolated AI/AO FTAs (51304644, 51304640, 51304648, 51304650), other non-isolated AO FTAs, discrete DI/DO termination boards, dedicated TC/RTD FTAs, pulse counter and serial communication terminal assemblies cannot pair with this non-isolated non-HART AI IOP card.