I. Product Introduction

51309118‑225 (Model MC‑TDIY22) is a 16-channel digital input FTA (Field Terminal Board) for the Honeywell UCN/Experion PKS/TDC3000 system, specifically equipped with MU‑PDIY22/MC‑PDIY22 (DI IOP) digital input cards. It has no anti-corrosion coating, CE compliance, and is used in dry, non-corrosive control rooms to collect 24VDC/120VAC switch quantity signals.

II. Model Interpretation

51309118‑225: Honeywell material code, the last ‑225 indicates no anti-corrosion coating + CE certification + standard terminals.

MC‑TDIY22: Product model, MC = module prefix, TDIY = Digital Input, 22 = sub-model; FTA = Field Terminal Board.

Same series: 51309118‑175 is the **version with anti-corrosion coating (CC)**, suitable for harsh conditions.

III. Technical Parameters

Channel Quantity: 16 digital input channels (single-ended).

Input Signals: 24VDC (dry contact / wet contact), 120VAC, compatible with buttons, limit switches, relay contacts.

Terminal Type: Red compression terminals (Compression), resistant to vibration, reliable connection.

Isolation Characteristics: Electrical isolation between channels, between the field and the system side at 2500 VAC, anti-surge and common-mode interference.

Coating: No anti-corrosion coating (non‑CC), only applicable to dry environments.

Compliance Certification: CE certification (EMC/LVD Directive).

Operating Environment: Temperature ‑20 ℃ to +60 ℃, humidity 5%–95% without condensation; prohibited in damp / dust / corrosive environments.

Mechanical Dimensions: 6 inches (152 mm) Size A standard DCS card.

Weight: Approximately 0.65 kg.

Redundancy Support: Non-redundant, redundancy requires two FTA + two IOP.

IV. Interface and Communication Configuration

Field Side: 16 compression terminals, connected to switches / relays / contacts, single-ended grounding of the shielding layer.

System Side: Special high-density connector, directly connected to MU‑PDIY22/MC‑PDIY22 IOP card.

Communication: Relying on IOP card to access UCN network, supports remote configuration, diagnosis, and fault upload.

V. Core Functions

Signal Conversion: 16 centralized wiring, simplifies cabinet wiring, facilitates maintenance.

Signal Conditioning: Board-mounted filtering + isolation, suppresses EMI/RFI, ensures stable switch quantity collection.

Line Protection: Overcurrent / overvoltage protection, blocks abnormal signals from the field, protects IOP card.

Fault Diagnosis: Channel open / short circuit detection, fault information uploaded to the upper computer.

Hot Swap: Supports online replacement, does not affect system operation, shortens downtime.

VI. Application Scenarios

Petrochemicals, power, water treatment: Switch quantity collection in conventional control rooms (pump / valve status, limit switches, alarm contacts).

Honeywell TDC3000/Experion PKS: Paired with MU‑PDIY22/MC‑PDIY22 to build a high-density digital input system.

Environmental Limitations: Only applicable to dry, dust-free, and non-corrosive gas control rooms, not for outdoor or humid sites.

VII. Usage and Maintenance Instructions Instruction Manual

Installation: Insert into the standard Size A rack slot and lock it in place with the IOP card; supports hot swapping.

Wiring: Connect the positive and negative terminals of the contacts to the corresponding terminals, and press them firmly; single-ended grounding of the shielded wire to avoid circulating current.

Configuration: Configure the channel type (24VDC/120VAC) and debounce time on the engineer station, and it can be collected after downloading.

Maintenance instructions

Regular inspection: Check the terminal tightening every quarter, ensure there is no oxidation on the wiring, and ensure the connectors are in good contact.

Environmental maintenance: Keep the cabinet dry and dust-free, with a temperature range of -20 ℃ to +60 ℃, and keep away from strong electromagnetic interference.

Fault handling: First check the wiring / grounding for abnormal signals, then check the connection between the connector and the IOP card; if damaged, it can be replaced online.

Storage: Store the spare board cards in a cool and dry place, with a temperature range of -40 ℃ to +85 ℃, avoiding heavy pressure and vibration.

Note: Without anti-corrosion coating, it is strictly prohibited to use in a humid / corrosive environment for a long time.