2. Model Definition

51304487: Base model for 16-channel compact non-HART analog output FTA

-150: Moderate enhanced industrial PCB grade

Medium-thin upgraded full-board conformal coating, better resistance to moderate humidity, dust and weak corrosive fumes than -100 baseline

Moderately boosted energy bidirectional TVS transient surge suppression per channel

Dual-stage RC low-pass EMI filter network for moderately noisy plant environments

Reinforced freewheeling diode networks for inductive valve coil back-EMF absorption

Precision calibrated series damping resistors for stable 4–20mA linearity

Thickened reinforced physical channel isolation barriers to cut cross-channel analog crosstalk

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

Incompatible Hardware: HART AO FTA(51304481), HART AI FTA(51304477), non-HART AI FTA(51304485), discrete DI/DO FTA, pulse counter FTA, serial communication FTA, TC/RTD LLAI FTAs

3. Technical Specifications

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

Supported Field Loads

2-wire standard 4–20mA I/P electro-pneumatic transducers, conventional pneumatic valve positioners, air damper actuators

Resistive signal lamps, small inductive control coils (no HART communication function)

FTA Structure: Fully passive termination block with no onboard power supply; per-channel damping, kickback protection and surge suppression integrated

PCB Protection: Medium-thin enhanced conformal coating; flammability rating UL94 V0

Terminal Type: Compression screw terminals, compatible with 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; wider humidity and dust tolerance than 51304487-100

Circuit Architecture

Dual-stage low-pass EMI filtering to suppress moderate switching noise from VFD banks, high-current contactors and switchgear

Enhanced bidirectional transient overvoltage surge suppression on Ch+ and loop return lines

High-capacity flyback diodes to eliminate inductive coil back electromotive force spikes

Tightly matched series damping resistors to stabilize output current linearity across full range

Strengthened channel partitions to eliminate inter-channel signal bleed and interference

Redundancy Compatibility: Fully supports primary/standby redundant non-HART AO IOP architecture; hot-swap IOP card replacement permitted

Approximate Unit Weight: 0.358 kg

4. Interface & Communication Configuration

Inner IOP Connection: Locking flat ribbon cable directly mates to non-HART AO IOP pin headers. Reinforced cable strain relief prevents pin header deformation or fracture under long-term tension of field wiring harnesses. No onboard signal amplification; pure DC 4–20mA drive current passes through filter and protection networks straight to field load terminals. The AO IOP generates analog setpoint levels, exchanges control values with Experion PKS controller via UCN bus.

Field Outer Terminals: Clearly labeled Ch+ / Loop– terminals for two-wire actuator wiring; loop drive power is fully supplied by the paired non-HART AO IOP through FTA passive circuits.

Loop Power Source: Regulated 4–20mA drive power sourced from analog output IOP card.

5. Core Functions

Cable Strain Relief: Reinforced strain relief protects fragile AO IOP pin headers from mechanical stress and fatigue breakage caused by continuous pulling force of multi-core field control cables.

Dual-Stage Enhanced EMI Noise Rejection: Two-layer filter architecture attenuates significantly more plant electromagnetic interference than single-stage -100 grade, effectively suppressing valve hunting, output jitter and setpoint drift in motor/VFD-heavy process areas.

Upgraded Surge & Inductive Kickback Protection: Higher-energy TVS clamping diodes absorb large induced voltage spikes, wiring short transients and switching arcs; reinforced freewheeling diodes fully dissipate coil back-EMF, providing robust protection for sensitive AO IOP output drive transistors.

Moderate Enhanced Environmental Barrier: Medium-thin conformal coating fully encapsulates PCB substrate, solder pads, copper traces and all passive components. It maintains stable 24/7 analog control under long-term elevated humidity, moderate dust accumulation and trace mild acidic/alkaline corrosive fumes.

Uniform Output Linearity Consistency: Precision calibrated damping resistors deliver identical current response and linear scaling across all 16 output channels, ensuring consistent valve stroke and actuator response.

Isolated Single‑Channel Maintenance: Independent terminal blocks support actuator/I/P transducer replacement, loop resistance testing and fault troubleshooting for one control loop without disrupting the other 15 analog output control loops.

Redundancy Hot‑Swap Capability: Standby redundant non-HART AO IOP cards can be replaced online without losing critical flow, pressure, level valve setpoints.

6. Application Scenarios

Applicable Industries

Petrochemical complexes, chemical processing plants, thermal & combined-cycle power stations, oil & gas refineries, pulp & paper mills, high-humidity water treatment facilities, medium‑humidity pharmaceutical batch production lines.

Non-HART Analog Control Loops

Conventional I/P electro-pneumatic transducers, standard pneumatic valve positioners, air damper actuators, blending control valves, pressure reducing valve coils, cooling water flow control actuators, furnace draft damper positioners.

Cabinet Deployment

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

7. Wiring, Operation & Maintenance Guidelines

Wiring Standards

Two-wire actuator wiring: Actuator positive connects to FTA Ch+, actuator negative connects to FTA Loop–; reversed polarity leads to output offset and degraded kickback protection performance.

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

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

Spare Part Interchangeability

51304487-150 shares identical non-HART analog output circuit topology with -100/-200 variants, fully interchangeable for emergency field substitution. The -150 grade is cost-balanced for cabinets with moderate humidity/dust where basic -100 lacks stability margin, without the premium cost of heavy-duty -200 units.

Standard Fault Troubleshooting Flow

Valve hunting / no actuator stroke / full saturation output / unstable PV → Retighten compression terminal screws → Measure loop drive current at load terminals → Test loop for open/short circuits → Inspect actuator coil continuity → Confirm ribbon cable fully locked into non-HART AO IOP header → Diagnose operational health of paired AO IOP card.