2. Model Definition

51304542: Base model for 16-channel compact non-isolated 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 VFD/contactor switching noise

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

Fixed precision series damping resistors to stabilize 4–20mA output linearity

Basic physical channel isolation barriers to reduce cross-channel analog crosstalk

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

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

3. Technical Specifications

Channel Count: 16 independent non-isolated 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 indicator loads, small inductive control coils (no HART communication)

FTA Structure: Fully passive termination 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 interference

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

Freewheeling diodes to absorb inductive coil back electromotive force spikes

Matched series damping resistors to stabilize full-range output current linearity

Basic isolation partitions to minimize inter-channel signal bleed and output drift 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-isolated 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 load terminals. 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 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 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 reducing valve coils, cooling water flow control actuators, furnace draft damper positioners.

Cabinet Deployment

Dedicated compact slot for 16-point non-isolated 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 AO analog cables physically separated from high-current AC power cables to reduce EMI coupling interference.

Spare Part Interchangeability

51304542-100 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 actuator stroke / full saturation output / unstable PV → 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.