2. Model Definition

51304487: Base part number for 16-channel compact non-HART analog output 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 for routine plant switching noise

Flyback freewheeling diode networks for inductive valve coil back-EMF protection

Fixed damping series resistors for stable 4–20mA output linearity

Basic physical channel isolation barriers to reduce 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, pulse counter, serial communication, 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 transducers, conventional valve positioners, damper actuators

Resistive indicator loads, small inductive control coils (no HART communication)

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

PCB Protection: Standard full conformal coating; flammability UL94 V0

Terminal Type: Compression screw terminals, 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 to attenuate minor VFD/contactor power noise

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

Freewheeling diodes to absorb inductive coil back electromotive force

Matched series damping resistors to stabilize output current linearity

Basic isolation partitions to minimize inter-channel signal interference

Redundancy Compatibility: Supports primary/standby redundant non-HART AO 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 AO IOP pin headers. Built-in cable strain relief prevents pin header deformation/fracture from field wiring harness tension. No onboard signal amplification; pure DC 4–20mA drive current passes through filter/protection networks to field terminals. AO IOP generates analog setpoint levels, transmits control values via UCN bus to/from Experion PKS controller.

Field Outer Terminals: Clearly labeled Ch+ / Loop– terminals for two-wire actuator wiring; loop drive power supplied entirely by 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: Shields fragile AO IOP pin headers from mechanical damage caused by long-term pulling tension on multi-core field control cables.

Standard EMI Noise Filtering: Single-stage RC filtering suppresses low-level electromagnetic interference to prevent valve hunting, output jitter and setpoint drift in general industrial environments.

Basic Surge & Inductive Kickback Protection: TVS diodes absorb low-magnitude wiring transients, switching arcs; freewheeling diodes eliminate coil back-EMF voltage spikes that would damage IOP output drive transistors.

Standard Environmental Barrier: Basic conformal coating encapsulates PCB traces, pads and passive components to resist normal ambient humidity and dust for 24/7 steady analog control operation.

Uniform Output Linearity: Precisely matched damping resistors deliver identical current response and linear scaling across all 16 output channels for consistent valve stroke performance.

Independent Single-Channel Maintenance: Separated terminal blocks allow actuator/I/P replacement, loop resistance testing and fault troubleshooting for one control loop without disrupting the other 15 analog outputs.

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 plants, thermal power stations, oil & gas refineries, pulp & paper mills, water treatment facilities, standard 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 regulating valve coils, cooling water flow control actuators.

Cabinet Deployment

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

7. Wiring, Operation & Maintenance Guidelines

Wiring Standards

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

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

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

Spare Part Interchangeability

51304487-100 shares identical non-HART analog output 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

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