2. Model Definition

51304584: Base model for 16-channel compact non-isolated HART analog input FTA

-100: Standard baseline PCB grade

Basic full-board moisture & dust resistant conformal coating

Standard per-channel bidirectional TVS transient surge suppression

Single-stage RC low-pass EMI filter tuned to preserve HART high-frequency digital signals

Precision low-distortion HART coupling capacitor networks for bidirectional polling

Matched loop current limiting resistors for uniform transmitter short-circuit protection

Basic physical channel isolation barriers to reduce analog/HART inter-channel crosstalk

Matched IOP Hardware: Honeywell 16-channel non-isolated HART-capable 4–20mA analog input UCN IOP card

Incompatible Hardware: Isolated HART AI (51304518), non-HART AI/AO, isolated DI/DO, TC/RTD LLAI, pulse counter, serial communication FTAs

3. Technical Specifications

Channel Count: 16 independent non-isolated HART 4–20mA analog input channels

Supported Field Devices

Two-wire HART 4–20mA smart transmitters (pressure, flow, level, temperature, analytical)

Backward compatible with conventional non-HART 4–20mA two-wire transmitters

FTA Structure: Fully passive termination block; no onboard isolated power; HART coupling, filter and surge protection integrated per channel

PCB Protection: Standard full conformal coating; flammability UL94 V0

Terminal Type: Compression screw terminals, accepts solid/stranded copper wire up to 14 AWG

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

Operating Ambient: 0℃ ~ +60℃ indoor cabinet only

Circuit Architecture

Single-stage low-pass EMI filtering optimized to avoid attenuating HART AC modulation signals

Bidirectional transient overvoltage TVS surge suppression on Ch+ and loop return lines

Low-ESR coupling capacitors to maintain stable HART signal amplitude without DC loop loss

Tightly calibrated current-limit resistors to protect transmitters and IOP inputs during field shorts

Basic isolation partitions to minimize inter-channel analog bleed and HART interference

Redundancy Compatibility: Supports primary/standby redundant non-isolated HART AI IOP architecture; hot-swap IOP card replacement allowed

Approximate Unit Weight: 0.357 kg

4. Interface & Communication Configuration

Inner IOP Connection: Locking flat ribbon cable mates directly to non-isolated HART AI IOP pin headers. Integrated cable strain relief prevents pin header deformation/fracture from multi-core instrument wiring harness tension. Combined DC 4–20mA analog + HART AC signals pass through filter/surge networks straight to IOP; IOP performs A/D conversion, HART modulation/demodulation, device diagnostics, and transmits process values to Experion PKS controller via UCN bus.

Field Outer Terminals: Clearly labeled Ch+ / Loop– terminals for two-wire transmitter wiring; loop excitation power supplied entirely by paired non-isolated HART AI IOP through FTA passive circuits.

Loop Power Source: Regulated 4–20mA loop excitation current sourced from HART analog input IOP card.

5. Core Functions

Cable Strain Relief: Protects delicate HART AI IOP pin headers from mechanical damage caused by long-term pulling tension on field instrument cabling.

Standard HART‑Friendly EMI Noise Filtering: Single-stage RC filtering suppresses low-level VFD/contactor interference without distorting HART digital waveforms, reducing mild PV drift and occasional HART poll retries in general industrial environments.

Basic Surge & Short-Circuit Protection: Bidirectional TVS diodes absorb low-magnitude wiring transients and switching arcs, shielding sensitive high-impedance HART IOP input circuits.

Standard Environmental Barrier: Basic conformal coating encapsulates PCB traces, solder pads and passive components to resist normal ambient humidity and dust for reliable 24/7 process measurement and HART device diagnostics.

Uniform Loop & HART Consistency: Precision matched coupling capacitors and limit resistors deliver identical loop excitation, analog linearity and HART communication performance across all 16 channels.

Independent Single-Channel Maintenance: Separated terminal blocks allow HART transmitter replacement, loop resistance testing, handheld HART communicator connection and fault troubleshooting for one loop without disrupting the other 15 measurement inputs.

Redundancy Hot-Swap Capability: Standby redundant non-isolated HART AI IOP cards can be replaced online without losing critical process PV values, HART fault alarms or calibration status data.

6. Application Scenarios

Applicable Industries

Petrochemical complexes, chemical plants, thermal power stations, oil & gas refineries, pulp & paper mills, water treatment facilities, standard humidity pharmaceutical batch production lines.

HART Analog Measurement Loops

HART differential/pressure transmitters, mass/vortex/turbine flow transmitters, radar/ultrasonic level transmitters, smart RTD/TC temperature transmitters, pH/ORP/DO/conductivity analytical HART transmitters; suited for plant sites with unified single-ground cabinet layouts.

Cabinet Deployment

Dedicated compact slot for 16-point non-isolated HART analog input inside high-density space-saving DCS I/O control cabinets.

7. Wiring, Operation & Maintenance Guidelines

Wiring Standards

Two-wire transmitter wiring: Transmitter positive → FTA Ch+, transmitter negative → FTA Loop–; reversed polarity causes measurement offset and degraded HART signal stability.

Handheld HART communicator connection: Clip leads across Ch+ / Loop– terminals at FTA or transmitter; no external load resistor required for standard two-wire loops.

Use shielded twisted-pair instrument cable for all field runs; implement single-point shield grounding only at DCS cabinet FTA side to suppress ground loop noise and HART timeouts.

Route HART analog cables physically separated from high-current AC power, MCC and VFD output wiring to minimize EMI coupling interference.

Spare Part Interchangeability

51304584-100 shares identical non-isolated HART analog input circuit topology with -150/-200 upgraded grades, fully interchangeable for emergency field replacement. The -100 baseline is cost-optimized for non-corrosive, moderate humidity standard cabinet environments.

Standard Fault Troubleshooting Flow

PV drift / intermittent HART timeouts / no transmitter detected / saturated reading → Retighten compression terminal screws → Measure loop current at transmitter terminals → Test loop open/short and insulation resistance → Verify transmitter power draw → Confirm ribbon cable fully locked into non-isolated HART AI IOP header → Diagnose operational health of paired HART IOP card.