オムロン DCN1-3T-ポート

DCN1-3T-ポート = DCN1-3. 業界では一般に DeviceNet T 分岐スプリッタとして知られています / 3-ポートTAP端子台, it is printed with the marking “T-PORT TAP” and serves as a dedicated branching module for オムロン DeviceNet fieldbus.

Model Suffix Differentiation (Mandatory Reading for Procurement)

モデル	Configuration Description
DCN1-3 (bare unit)	Base only, without 5 sets of terminal blocks; XW4B terminals must be ordered separately
DCN1-3C	Standard equipped with 5 side-entry screw terminals (most widely used in industry)
DCN1-3NC	Top-entry latch-type terminals for screw-free fast wiring

Hardware Port Structure (5-channel 5-pin DeviceNet Standard)
2 Main Line Ports: Bus trunk line input and output for daisy-chain networking
3 Branch Ports: までサポート 3 DeviceNet slave devices connected simultaneously (センサー, remote I/Os, インバータ)
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

ピンの定義 (Standard 5-pin DeviceNet):

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

Ⅲ. コア電気 & 機械仕様

Electrical Ratings

Bus Standard: DeviceNet 2.0A / 2.0B

供給電圧: DC 11～24V (bus-powered)

Single Branch Current Rating: マックス. 4あ; Total module rated current: 8あ

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

Supported Baud Rates: Full range 125k / 250k / 500 kbps

環境 & Mounting Specifications

取り付け: Snap-on mounting on standard 35mm DIN rail

全体の寸法: 142(L) × 45(W) × 31.3(D) mm

正味重量: 110 g

動作温度: -10℃ ～ +55℃

保管温度: -25℃ ～ +70℃, Humidity 5%～95% non-condensing

保護クラス: IP20 (for cabinet installation only; not for outdoor exposed use)

Networking Principle & アプリケーションシナリオ
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.

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

制限: Total cable length per branch must comply with DeviceNet specifications (最大. 100 m per branch at 500 kbps).

Typical Industrial Applications

Automotive assembly lines, 包装機械, logistics sorting lines

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

包装内容明細書 & オプションのアクセサリ

Standard Factory Package for DCN1-3C

1 × DCN1-3 Main Unit
5 sets of 5-pin screw terminals XW4B-05C1-H1-D
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

一般的なトラブルシューティングマトリックス

故障現象	根本的な原因	解決
Branch devices undetectable during bus scan	Loose terminal crimping; CAN_H / CAN_L reversed	端子の増し締め; verify pin assignment for red and blue signal wires
Severe communication lag & packet loss across the whole bus	No terminating resistors fitted at both bus ends	Insert matching resistors into the DCN1 module at the far end of the link
No power supply to branch devices after power-on	Loose crimps on V+ / V− power cables	Inspect wiring on pins 1 そして 4
Frequent disconnection of single-branch devices	Excessively long branch cables; ungrounded shielding	Shorten branch cables; connect shield terminals to cabinet earth bar

Ⅶ. Cross-Series Alternative Comparison

モデル	Number of Branches	Cable Entry Type	アプリケーションシナリオ
DCN1-1C	1 branch	Side screw terminals	Short branch for single-point devices
DCN1-2C	2 branches	Side screw terminals	Compact layout with two slave devices
DCN1-3C	3 branches	Side screw terminals	Central multi-way splitting (mainstream model)
DCN1-4C	4 branches	Top entry	Dense cabinet layout with multiple devices

インストールを完了する & 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.

Preparatory Tools & 材料
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

ツール

Flathead screwdriver, ワイヤーストリッパー, dedicated 5-core shielded DeviceNet cable (Red = V+, Black = V−, White = CAN_H, Blue = CAN_L, Bare wire = Drain Shield)

ソフトウェア

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

ステップ 1: Mechanical DIN Rail Mounting (Power Disconnected)
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.
除去: Pinch the bottom latch outward and lift upward to detach the unit.
Alternative Fixing: If no DIN rail is available, fasten the unit to the cabinet backplate via Φ3.5 mounting holes on both sides.
環境要件: IP20 rated, for cabinet interior use only. Keep away from high-interference sources such as inverters and contactors; operating environment range: -10~+55℃.

Ⅲ. ステップ 2: 端子の定義 & 標準配線 (Core Procedure)

Unified 5-Pin Pinout (Identical for all terminals)

ピン番号.	ワイヤーの色	信号名	機能の説明
1	黒	V−	24V bus power negative
2	青	CAN_L	Communication differential negative signal wire
3	白	CAN_H	Communication differential positive signal wire
4	赤	V+	24V bus power positive
5	Bare Copper Wire	Drain Shield	Cable shield grounding

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

ターミナル 1 (): Trunk IN (Input from PLC master station / preceding bus segment)

ターミナル 2 (): Trunk OUT (Output to next bus segment)

> キーノート: 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.

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

Terminal Wiring Procedures
Pull out the XW4B terminal block and loosen all set screws.
Strip 5 mm insulation from cable ends; crimp bare drain shield wire separately to Pin 5.
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).
Reinstall the terminal block and confirm no loose wiring or exposed conductors.
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.
ステップ 3: Terminating Resistor Installation (Critical for Stable Communication; Common Error Point)
A dedicated black socket on the right side of the DCN1-3 unit is reserved for the supplied 121Ω terminating resistor.
ルール: 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.

例: 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.

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

500 kbps: マックス. single branch length ≤6 m; total length of all branches on network ≤30 m

250 kbps: マックス. single branch length ≤6 m; total length of all branches on network ≤78 m

125 kbps: マックス. single branch length ≤6 m; total length of all branches on network ≤156 m

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.
Current Capacity: マックス. 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.
ステップ 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

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

Ⅶ. ステップ 6: Power-On, 通信テスト & トラブルシューティング

Power-Up Sequence
Double-check all wiring, terminating resistors and shield grounding for correctness.
Power on the PLC and DeviceNet bus first.
Power on slave devices on branches sequentially (remote I/Os, インバータ, 等).
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

故障現象	根本的な原因	解決
No devices detected across the whole bus	CAN_H / CAN_L reversed; trunk line connected to branch terminals; no terminating resistors at both ends	Swap wires on Pin 2 そして 3; re-route trunk to * marked terminals; install 121Ω resistors at both ends
Single-branch devices drop offline	Branch cable exceeds 6 メートル; loose terminal crimping; overloaded branch current	Shorten branch cables; 端子の増し締め; add supplementary bus power module
Intermittent communication lag & random disconnections	Double-ended shield grounding; parallel routing with power cables; excessive terminating resistors fitted	Float shielding at remote ends; separate cable routing; retain resistors only at two link ends
No 24V power to devices	Loose V+ / V− pins; insufficient bus supply power	Re-crimp red and black power cables; install DCN1-1P power splitter

VIII. Non-Negotiable Installation Prohibitions

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