OMRON DCN1-3T-PORT

DCN1-3T-PORT = DCN1-3. Commonly known in the industry as a DeviceNet T-branch splitter / 3-port TAP terminal block, it is printed with the marking “T-PORT TAP” and serves as a dedicated branching module for Омрон DeviceNet fieldbus.

Model Suffix Differentiation (Mandatory Reading for Procurement)

1. Hardware Port Structure (5-channel 5-pin DeviceNet Standard)
2. 2 Main Line Ports: Bus trunk line input and output for daisy-chain networking
3. 3 Branch Ports: Supports up to 3 DeviceNet slave devices connected simultaneously (датчики, remote I/Os, инверторы)
4. Built-in Terminating Resistor Socket: Blue plug-in terminal on the module side. A 121Ω terminating resistor must be inserted at the bus end to suppress signal reflection

Определение контакта (Standard 5-pin DeviceNet):

1: V− (Power Negative), 2: CAN_L, 3: CAN_H, 4: В+ (Power Positive), 5: Shield Ground

III. Core Electrical & Mechanical Specifications

1. Электрические параметры

Bus Standard: DeviceNet 2.0A / 2.0Б

Напряжение питания: DC 11～24V (bus-powered)

Single Branch Current Rating: Макс. 4А; Total module rated current: 8А

Matching Terminating Resistor: Built-in mounting position, supplied with 121Ω / 0.25W resistor

Supported Baud Rates: Full range 125k / 250k / 500 кбит/с

2. Относящийся к окружающей среде & Mounting Specifications

Монтаж: Snap-on mounting on standard 35mm DIN rail

Габаритные размеры: 142(л) × 45(Вт) × 31.3(Д) мм

Вес нетто: 110 г

Рабочая температура: -10℃ ～ +55℃

Температура хранения: -25℃ ～ +70℃, Humidity 5%～95% non-condensing

Класс защиты: IP20 (for cabinet installation only; not for outdoor exposed use)

1. Networking Principle & Сценарии применения
2. Network Topology

The two main ports of DCN1-3 are directly connected to the trunk line, with independent equipment tapped off the 3 branch ports.

Преимущества: No on-site wire stripping and jointing required; faults on one branch are isolated without disrupting communication on the entire bus.

Restriction: Total cable length per branch must comply with DeviceNet specifications (Макс. 100 m per branch at 500 кбит/с).

2. Typical Industrial Applications

Automotive assembly lines, упаковочное оборудование, логистические сортировочные линии

Branch splitting for Omron DeviceNet remote I/Os (DRT series), 3G3MV / 3G3RX inverters, E3Z / E2E bus sensors

1. Packing List & Дополнительные аксессуары

Standard Factory Package for DCN1-3C

1. 1 × DCN1-3 Main Unit
2. 5 sets of 5-pin screw terminals XW4B-05C1-H1-D
3. 1 × 121Ω bus terminating resistor

Separately Orderable Accessories

DCN1-3 (terminal-less version): Terminals need to be purchased additionally

DCN1-1 / DCN1-2: Compact 1-port / 2-port TAPs (alternative models within the same series)

DCA1 series DeviceNet bus cables, pre-assembled M12 connectors

1. Общая матрица устранения неполадок

VII. Cross-Series Alternative Comparison

Complete Installation & Configuration Manual for OMRON DCN1-3 (DCN1-3T-PORT)

The DCN1-3 is a dedicated T-type 3-way branching terminal block for DeviceNet (commonly referred to as T-PORT). The whole operation consists of six steps: Mechanical Mounting → Terminal Wiring → Terminating Resistor Setup → Network Topology Compliance → PLC Software Configuration → Power-On Test. All operations must be performed with power disconnected.

1. Preparatory Tools & Материалы
2. Standard Supplied Materials (DCN1-3C terminal-equipped version)

DCN1-3 main unit, 5 sets of 5-pin screw terminals XW4B-05C1-H1-D, 1 × 121Ω terminating resistor

2. Инструменты

Flathead screwdriver, инструмент для зачистки проводов, dedicated 5-core shielded DeviceNet cable (Red = V+, Black = V−, White = CAN_H, Blue = CAN_L, Bare wire = Drain Shield)

3. Программное обеспечение

CX-Programmer + CX-Integrator (Omron DeviceNet network configuration tool)

1. Шаг 1: Mechanical DIN Rail Mounting (Power Disconnected)
2. Rail Latches: Upper and lower latches are located at the unit bottom. Hook onto the top edge of a standard 35mm DIN rail first, then press down the bottom latch until a click sound confirms locking.
3. Removal: Pinch the bottom latch outward and lift upward to detach the unit.
4. Alternative Fixing: If no DIN rail is available, fasten the unit to the cabinet backplate via Φ3.5 mounting holes on both sides.
5. Экологические требования: IP20 rated, for cabinet interior use only. Keep away from high-interference sources such as inverters and contactors; operating environment range: -10~+55℃.

III. Шаг 2: Определение терминала & Стандартная проводка (Core Procedure)

1. Unified 5-Pin Pinout (Identical for all terminals)

2. Distinction of 5 Терминалы (2 Main Line Ports + 3 Branch Ports; Trunk lines must connect to the two marked terminals)

Терминал 1 (): Trunk IN (Input from PLC master station / preceding bus segment)

Терминал 2 (): Trunk OUT (Output to next bus segment)

> Ключевое примечание: The two terminals are directly connected with minimal internal resistance and must carry the main trunk line. The remaining 3 unmarked terminals are branch ports for external slave devices including DRT remote I/Os, inverters and bus sensors.

Терминалы 3/4/5: Independent branch outputs for Branch 1 / 2 / 3

3. Terminal Wiring Procedures
4. Pull out the XW4B terminal block and loosen all set screws.
5. Strip 5 mm insulation from cable ends; crimp bare drain shield wire separately to Pin 5.
6. Insert wires strictly in the order: Red to Pin4, Black to Pin1, White to Pin3, Blue to Pin2, then fully tighten screws (Multiple wires in one pin hole are prohibited).
7. Reinstall the terminal block and confirm no loose wiring or exposed conductors.
8. Shield Grounding Rule: Single-End Grounding. Connect Pin5 shield to the earth bar only inside the PLC master cabinet; leave shielding floating at remote device ends to avoid circulating current caused by double-ended grounding which disrupts communication.
9. Шаг 3: Terminating Resistor Installation (Critical for Stable Communication; Common Error Point)
10. A dedicated black socket on the right side of the DCN1-3 unit is reserved for the supplied 121Ω terminating resistor.
11. Правило: Only fit one 121Ω resistor at each physical extreme end of the entire DeviceNet trunk line; no terminating resistors shall be fitted on any intermediate DCN1 splitters.

Пример: Fit a resistor at the PLC master port as the start of the link; fit another resistor on the last device / last DCN1 of the entire bus; leave resistor sockets empty on all intermediate DCN1 units.

3. Prohibition: Fitting 3 or more resistors on one bus will pull down bus voltage and cause device disconnections.
4. Шаг 4: Mandatory Wiring Topology & Length Specifications (Violation Causes Direct Communication Failure)
5. Topology Requirement: Must adopt Linear Trunk + Short Branches. Star or tree-shaped parallel wiring is forbidden.
6. Branch Length Limits (Thin Cable Standard)

500 кбит/с: Макс. single branch length ≤6 m; total length of all branches on network ≤30 m

250 кбит/с: Макс. single branch length ≤6 m; total length of all branches on network ≤78 m

125 кбит/с: Макс. single branch length ≤6 m; total length of all branches on network ≤156 m

3. Wiring Separation: Maintain a minimum clearance of 10 cm between DeviceNet cables and power cables; cross perpendicularly if intersection is unavoidable. Long parallel laying is prohibited.
4. Current Capacity: Макс. 4 A per single branch; total module current ≤8 A. A supplementary DeviceNet power splitter DCN1-1P shall be added for multi-device branches requiring extra power supply.
5. Шаг 5: PLC Software Network Configuration (CX-Integrator)

The DCN1-3 only performs physical cable splitting, has no address and requires no independent software configuration. Only the bus master and downstream slaves need to be set up:

Operation Flow

1. Launch CX-Programmer and create a new project; add PLC CPU (CJ1 / CP1 / NJ series) and insert a DeviceNet master module (например. CJ1W-DRM21).
2. Right-click the master module → launch CX-Integrator network configuration tool.
3. Set global bus baud rate (all devices on the network must share the identical baud rate: 125 / 250 / 500 кбит/с).
4. Click [Network Scan]; the software will automatically identify all slave devices connected to the three branches of DCN1-3.
5. Assign a unique node address (1~63, no duplicates) to each slave device.
6. Configure I/O data mapping and download network parameters to the PLC master station.
7. Save the project and close the configuration tool.

VII. Шаг 6: Power-On, Communication Test & Поиск неисправностей

1. Power-Up Sequence
2. Double-check all wiring, terminating resistors and shield grounding for correctness.
3. Power on the PLC and DeviceNet bus first.
4. Power on slave devices on branches sequentially (remote I/Os, инверторы, и т. д.).
5. Communication Acceptance Criteria

RUN indicator of PLC master module stays solid ON; ERR indicator remains OFF.

All scanned slaves show online status without red fault markers in CX-Integrator.

Stable read/write access to slave I/O signals with no packet loss or communication errors.

Quick Troubleshooting Matrix

VIII. Non-Negotiable Installation Prohibitions

1. Do not route trunk lines into the 3 unmarked branch terminals, which will trigger abnormal communication impedance.
2. Do not fit terminating resistors on any DCN1 units other than the two physical bus ends.
3. Do not use branch cables longer than 6 метры.
4. Do not reverse CAN_H and CAN_L signal wires.
5. Do not insert multiple conductors into one wiring terminal hole.
6. Do not install outdoors without a cabinet (IP20 with no waterproof rating).