2. Model Definition

51304441: Base part number for 16-channel compact HLAI FTA, dedicated pairing with MC-AIH70 high-level analog input IOP module

-200: Medium heavy reinforced industrial PCB grade

Medium heavy-duty full-board conformal coating, excellent resistance to sustained high humidity, heavy dust and mild acidic/alkaline corrosive vapors

High-capacity bidirectional transient, ESD and wiring fault surge suppression components

Multi-stage cascaded low-pass EMI filter network optimized for electrically noisy heavy industrial plant environments

Precision balanced matched impedance trace layout for consistent sampling accuracy and uniform response across all 16 channels

Matched IOP Hardware: MC-AIH70 (Compact UCN bus 16-point high-density 4–20mA / 0–10V analog input IOP card)

Incompatible Hardware: LLAI TC/RTD analog input FTA, HLAO analog output FTA, discrete DI/transistor/relay DO FTA, pulse counter FTA, serial communication FTAs

3. Technical Specifications

Channel Count: 16 independent high-level analog input channels

Supported Input Signal Types

4–20mA DC current loops (2-wire & 4-wire field transmitters)

0–10V DC voltage analog signals

FTA Design: Passive termination assembly; loop excitation power for 2-wire transmitters supplied via MC-AIH70 IOP

PCB Protection: Medium heavy-duty full 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 quick installation for 35 mm standard DIN rail

Operating Ambient: 0℃ ~ +60℃ (indoor cabinet only); broader tolerance for high humidity, dust and mild corrosion compared to -100/-125/-175 grades

Circuit Architecture

Multi-stage per-channel low-pass EMI filtering to eliminate severe industrial switching noise

High-energy bidirectional transient overvoltage surge suppression

Uniform balanced impedance routing to deliver identical signal response, gain and sampling speed for every channel

Reinforced thick physical channel partition barriers to eliminate inter-channel analog crosstalk

Redundancy Compatibility: Fully supports primary/standby redundant MC-AIH70 IOP architecture; hot-swap IOP card replacement permitted

Approximate Unit Weight: 0.361 kg

4. Interface & Communication Configuration

Inner IOP Connection: Locking flat ribbon cable connector directly mates to MC-AIH70 pin headers. Integrated cable strain relief prevents pin header deformation or fracture caused by pulling tension from field instrument wiring harnesses. No independent communication processor; calibrated process variable values transmit over UCN control bus to DCS controller via MC-AIH70.

Field Outer Terminals: Clearly silkscreened positive/negative signal terminals, with dedicated loop power tap pins for 2-wire transmitters. Thick physical channel separation drastically minimizes analog crosstalk interference between adjacent measurement loops.

Loop Power Supply: Cabinet 24VDC system power provides excitation current for 2-wire 4–20mA transmitters through the MC-AIH70 IOP interface.

5. Core Functions

Cable Strain Relief: Protects fragile MC-AIH70 IOP pin headers from mechanical stress, bending and fatigue breakage under long-term field wiring tension.

Multi-Stage Advanced Noise Rejection: Cascaded high-performance EMI filters suppress extreme interference from large VFD banks, high-current contactors and medium-voltage switchgear, nearly eliminating PV signal fluctuation to maintain stable PID closed-loop control.

Reinforced Surge & Transient Protection: High-capacity clamping diodes absorb intense induced voltage spikes, wiring fault transients and minor lightning induction surges, robustly safeguarding sensitive MC-AIH70 analog input front-end circuitry.

Medium Heavy-Duty Environmental Barrier: Thick conformal coating fully encapsulates PCB substrates, solder pads, copper traces and passive components. It enables stable 24/7 uninterrupted measurement operation in cabinets with long-term high humidity, heavy dust accumulation and trace mild acidic/alkaline corrosive fumes.

Uniform Channel Sampling Consistency: Precision balanced impedance layout ensures matching response speed, measurement accuracy and noise immunity across all 16 high-density input channels.

Isolated Single-Channel Maintenance: Separated terminal layout allows transmitter replacement, full loop resistance testing, precision mA/voltage calibration and fault troubleshooting for one channel without disrupting measurement performance of the remaining 15 process loops.

Redundancy Hot-Swap Capability: Standby MC-AIH70 IOP cards can be replaced online without halting critical flow, pressure, level and temperature closed-loop control and safety interlock logic.

6. Application Scenarios

Applicable Industries

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

Analog Measurement Control Loops

Differential pressure flow transmitters, gauge/absolute pressure transmitters, radar/displacer level transmitters, signal-converted RTD/thermocouple assemblies, pH/ORP/conductivity analytical transmitters, valve position feedback 4–20mA signals.

Cabinet Deployment

Dedicated compact terminal base for 16-point high-level analog input slots inside high-density space-saving DCS I/O control cabinets.

7. Operation, Wiring & Maintenance Instructions

Wiring Standards

Strictly follow positive/negative signal polarity marked on terminal labels; reversed polarity results in no valid PV reading or failure of 2-wire transmitters to power up.

Verify total loop resistance per channel stays within the maximum 4–20mA load drive range of the MC-AIH70 IOP for 2-wire instruments.

Use shielded twisted-pair instrument cable for all field wiring runs. Implement single-point shield grounding only at the cabinet FTA side to prevent harmful ground loop current formation.

Route analog signal cables physically separate from high-current AC power cables to minimize electromagnetic coupling noise.

Spare Part Interchangeability

51304441-200 shares identical core analog input circuit topology with -100/-125/-175 variants for direct emergency field substitution. The -200 medium heavy-duty grade is specified for cabinets with obvious high humidity, heavy dust or trace corrosive gas environments requiring elevated long-term reliability.

Standard Fault Troubleshooting Flow

No PV / fluctuating inaccurate analog readings → Retighten compression terminal screws → Measure mA/V output at transmitter terminals → Check 24V loop power integrity → Test loop open/short resistance → Confirm ribbon cable fully seated and locked into IOP header → Diagnose operational health of paired MC-AIH70 IOP card.