2. Model Definition

51304485: Base part number for 16-channel compact standard 4–20mA analog input FTA (Non-HART)

-100: Standard baseline PCB grade

Basic full-board moisture and dust resistant conformal coating

Standard per-channel bidirectional TVS transient surge suppression

Single-stage RC low-pass EMI filter network for routine plant switching noise

Precision loop current limiting resistors to protect transmitters and IOP input circuits

Basic physical channel partition barriers to reduce inter-channel analog crosstalk

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

Incompatible Hardware: HART AI FTA (51304477), HART AO FTA (51304481), discrete DI/DO FTA, pulse counter FTA, serial communication FTA, LLAI TC/RTD FTA

3. Technical Specifications

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

Supported Field Devices

Two-wire standard 4–20mA analog transmitters (no HART digital overlay)

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

PCB Protection: Standard full conformal coating; flammability rating 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 per-channel low-pass EMI filtering to suppress minor VFD, contactor and power wiring interference

Bidirectional transient overvoltage TVS surge suppression on channel positive and loop return lines

Tightly matched loop current limit resistors for uniform overload protection across all channels

Basic isolation barriers to minimize analog signal cross-talk between adjacent measurement loops

Redundancy Compatibility: Supports primary/standby redundant non-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-HART AI IOP pin headers. Integrated cable strain relief prevents pin header deformation or fracture from multi-core field wiring harness tension. No onboard signal conversion; pure DC 4–20mA analog current signals pass through filter and protection networks directly to IOP for A/D conversion. Process values are transmitted via UCN bus to the Experion PKS controller.

Field Outer Terminals: Clearly labeled Ch+ / Loop– terminals for two-wire transmitter wiring. Loop excitation power is supplied by the paired AI IOP card through the FTA passive networks.

Loop Power Source: Regulated 4–20mA loop drive power originates from the non-HART analog input IOP card.

5. Core Functions

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

Standard EMI Noise Filtering: Single-stage RC filtering suppresses low-level electromagnetic interference to reduce analog PV drift and measurement jitter in general industrial environments.

Basic Surge Clamping: Bidirectional TVS diodes absorb low-magnitude voltage transients from wiring shorts, induction and switching arcs, shielding sensitive high-impedance IOP analog 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 continuous process measurement.

Uniform Loop Overload Protection: Matched current-limit resistors ensure consistent overload cutoff across all 16 channels to prevent burnout of field transmitters and IOP inputs during short-circuit faults.

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

Redundancy Hot-Swap Capability: Standby redundant non-HART AI IOP cards can be replaced online without losing critical process pressure, flow, level or temperature PV values.

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.

Standard 4–20mA Measurement Loops

Conventional pressure/differential pressure transmitters, vortex/turbine flow transmitters, radar/float level transmitters, RTD/TC temperature transmitters, pH/conductivity/DO analytical transmitters (non-HART models).

Cabinet Deployment

Dedicated compact slot for 16-point non-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 connects to FTA Ch+, transmitter negative connects to FTA Loop–; reversed polarity creates measurement offset and unstable readings.

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

Route analog signal cables physically separated from high-current AC power cables to minimize EMI coupling interference.

Spare Part Interchangeability

51304485-100 shares identical non-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

Unstable PV / zero reading / full-scale saturated value → Retighten compression terminal screws → Measure loop current at transmitter terminals → Inspect wiring for open/short circuits → Confirm ribbon cable fully locked into non-HART AI IOP header → Verify operational health of paired analog input IOP card.