II. Model Interpretation

51204164: 8-channel AI analog input FTA basic material code

-175: PCB revision type number

Exclusive matching card: MC-TAIH22 (8-point 4–20mA high-level analog input module), cannot be paired with DI, DO, AO type terminal boards

III. Technical Parameters

Channel quantity: 8 independent isolated analog input channels

Compatible signals: Standard 4–20mA two-wire transmitter circuits

Loop power supply: Relying on the cabinet's 24VDC to feed the field transmitters

PCB flame retardant grade: UL94 V0 industrial flame retardant standard

Installation method: Standard 35mm DIN rail snap-in installation

Operating environment temperature: 0℃ ~ +60℃ in the control cabinet

Circuit properties: Passive substrate, built-in RC anti-interference filtering circuit

Protection mechanism: Independent current-limiting protection for each channel, short-circuit of the transmitter only damages a single channel, does not blow through the main control AI card

Insulation performance: Electrical isolation between channels, resisting industrial motor, frequency converter electromagnetic interference

IV. Interface and Communication Configuration

Internal interface connection to IO card: Special flat ribbon cable plug directly inserted into MC-TAIH22, no independent communication chip, measurement signals rely on UCN control bus transmission

External on-site wiring terminal: Screw compression type terminal block, zone-labeled positive and negative connection points of the transmitter

Power supply source: The reference power supply of the entire machine is taken from the unified 24VDC system power supply of the cabinet

V. Core Functions

Buffer the tension of thick-diameter instrument cables, protecting the precise pins of MC-TAIH22 card from being crushed or pulled and damaged

Built-in filtering circuit, smoothing noise interference, stabilizing measurement values of flow, pressure, level, temperature, etc.

Single-channel current-limiting protection, reducing the risk of card damage caused by transmitter short circuit

Standard terminal layout, facilitating instrument calibration, line disconnection, and fault point inspection

VI. Application Scenarios

Honeywell PKS UCN DCS projects in chemical, petrochemical, thermal power generation, oil and gas, papermaking, metallurgy and other process industries

Collect 4–20mA two-wire intelligent transmitter measurement signals

8-point analog input points of IO control cabinet as a complete wiring base plate

VII. Usage and Maintenance Instructions

Matching constraints: Can only be paired with MC-TAIH22 AI card,严禁 mixing with DI， DO， AO series FTA terminal boards

Wiring norms： Strictly distinguish the positive and negative poles of the transmitter， prohibit reverse connection； Select shielded cables for instrument cables， grounding the shield layer on one side of the cabinet

Replacement of spare parts： -175 and -125 electrical parameters are fully compatible， emergency repair can directly replace； Preferentially select the same tail number model for long-term stable operation

Troubleshooting steps： No measurement value → Tighten terminal wiring → Detect the current of the transmitter circuit → Check the connection status of the wiring → Verify the MC-TAIH22 card after the rear end