Model Definition

490: Modicon network accessory series

NAD: Profibus DP connector series

91104: In‑line connector, no terminator

Technical Specifications

Hardware & Interface

Protocol: Profibus DP (RS‑485, galvanic isolation)

Connector: 9‑pin male SUB‑D, right‑angle (elbow)

Termination: None (no 120 Ω resistor)

Wiring: Screw terminals for IN/OUT bus cables

Cable entry: Side entry

Color: Violet

Dimensions: ~30 mm (H) × 55 mm (W) × 65 mm (L)

Weight: ~45 g

Pinout: Pins 3 (RxD/TxD‑N), 5 (DGND), 6 (VP), 8 (RxD/TxD‑P)

Performance & Environmental

Data rate: 9.6 kbps – 12 Mbps

Max nodes/segment: 32 (127 with repeaters)

Operating temp: 0 °C to +60 °C

Storage temp: −25 °C to +80 °C

Humidity: 5%–95%, non‑condensing

Protection: IP20

Core Functions

In‑line connection: Passes Profibus DP signal through the device for daisy‑chain wiring

No termination: Leaves bus termination to the two end nodes (use 490NAD91103 there)

Signal integrity: Matches Profibus DP electrical specs for reliable communication

Application Scenarios

Middle stations in Profibus DP networks (PLCs, drives, I/O)

Modicon M340/Momentum/Premium PLCs

ATV61/ATV71 series VFDs with DP cards

Lexium 15 motion, TeSys motor starters, Preventa Safety PLCs

Usage & Maintenance

Use only for intermediate nodes (not at bus ends)

Wire incoming bus cable to “IN,” outgoing to “OUT”

Ensure the first and last nodes use 490NAD91103 (with terminator)

Keep connections tight and dry; inspect periodically for corrosion

490NAD91103 vs 490NAD91104

490NAD91103: Ends only, 120 Ω terminator ON

490NAD91104: Middle nodes, no terminator, pass‑through