This remote I/O system connects field devices to the main PLC over long distances. It supports up to 32 I/O modules in a distributed configuration. You can mount this unit directly on DIN rails near the machinery. The system reduces wiring costs by using a single communication cable.
Technical Specifications & Key Parameters
| Parameter | Detail |
|---|---|
| Product Model | ABB DX910 |
| Category | Remote S900 I/O System |
| Dimensions (H x W x D) | 120 mm x 90 mm x 65 mm |
| Weight | 0.42 kg (0.93 lbs) |
| Maximum I/O Modules | 32 modules per remote station |
| Communication Interface | RS-485 (Modbus RTU) or PROFIBUS DP |
| Baud Rate | 9600 to 115200 baud (software selectable) |
| Cable Length | 1200 meters maximum (RS-485) |
| Scan Time | 25 ms for 32 modules |
| Power Supply | 24 V DC nominal (18–32 V DC range) |
| Current Draw | 0.35 A at 24 V DC |
| Energy Storage | 1500 µF capacitor (holds configuration for 20 ms) |
| Component Count | 18 ICs, 22 capacitors, 28 resistors |
| Terminal Type | Removable 10-pin power/comm connector |
| Status LEDs | Power, comm active, fault, module ready |
| Mounting Method | Standard 35 mm DIN rail |
| Environmental Rating | IP20 (finger-safe protection) |
Detailed Feature Overview
ABB DX910 acts as a remote I/O head station for distributed control systems. It connects to the main PLC via RS-485 or PROFIBUS DP networks. The unit supports up to 32 I/O modules for large remote installations. This design eliminates hundreds of wires running back to the main cabinet. Consequently, you save significant material and installation labor costs.
The module scans all connected I/O modules every 25 milliseconds. It updates input data and executes output commands from the PLC. A 1500 µF capacitor stores the configuration for 20 milliseconds during power dips. This feature prevents network re-initialization after brief interruptions. Eighteen integrated circuits manage communication, data buffering, and power distribution.
Communication and Diagnostics
The RS-485 port supports Modbus RTU protocol for universal compatibility. Baud rates range from 9600 to 115200 for flexible network integration. The module automatically reports communication errors and I/O faults. Three status LEDs give immediate feedback on system health. The COMM LED blinks during active data exchange. The FAULT LED illuminates for any module or network error.
Installation and Environmental Limits
Mount the DX910 on standard 35 mm DIN rail in a control cabinet. The unit draws 0.35 A from a 24 V DC power supply. Connect the communication cable to the 10-pin removable connector. Daisy-chain multiple units on the same RS-485 network. Operating temperature ranges from -20°C to +60°C reliably. Keep humidity below 95% without condensation for long life. The IP20 enclosure protects against fingers but not water ingress.
Details
| Weight | 0.91 kg |
|---|---|
| Dimensions | 110 × 55 × 90 mm |
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