IOS/M12BDD-D2 IMO Remote I/O module, RS485 (HD) 4 DC In 8 Trans Out

Why Choose the IMO IOS/M12BDD-D2 Remote I/O Digital Input/Output Module?

The IMO IOS/M12BDD-D2 is a compact 12-channel digital remote I/O module designed for industrial automation, machinery and distributed control applications. Part of the IMO iOS Serial/Modbus Remote I/O series, it combines 4 digital NPN inputs and 8 NPN transistor outputs in a single DIN rail module, providing a practical solution where both field sensing and DC load control are required.

The four digital inputs support 12/24 V DC signals, while the eight NPN transistor outputs can switch up to 600 mA at 30 V DC per channel, subject to a maximum combined output current of 3 A. This mixed I/O configuration makes the IOS/M12BDD-D2 suitable for interfacing proximity sensors, switches and other digital devices while controlling indicators, relays, solenoids and compatible DC loads.

Communication is provided through Modbus RTU over an RS-485 half-duplex interface, allowing the module to operate as distributed I/O away from the main controller. Removable screw terminals, 2,000 V AC isolation and a slim 17.5 mm enclosure help make installation and maintenance straightforward in industrial control panels.

Key Advantages

• Combines 4 digital inputs and 8 NPN transistor outputs in one compact module.
• 12/24 V DC digital inputs suit common industrial sensors and switching devices.
• Each transistor output can switch up to 600 mA at 30 V DC.
• Supports a combined output load of up to 3 A.
• Modbus RTU communications provide straightforward integration with industrial control systems.
• RS-485 half-duplex networking supports distributed I/O installations.
• 2,000 V AC isolation between key circuits supports dependable industrial operation.
• Removable screw terminals simplify installation, maintenance and module replacement.

Key Features

• IMO iOS Serial/Modbus Remote I/O series.
• 12 total digital I/O channels.
• 4 NPN digital inputs with one common.
• 8 NPN transistor outputs.
• 12/24 V DC input voltage range.
• 4.7 kΩ input impedance.
• 30 V DC maximum input peak voltage.
• 10 V DC input ON level.
• 0–3 V DC input OFF level.
• Output switching capacity of 600 mA at 30 V DC per channel.
• 3 A maximum total output current.
• Modbus RTU over RS-485 half duplex.
• Removable screw-type terminal connections.
• Minimum PLC update/sample time of 20 ms, dependent on configuration.

Flexible Distributed Digital I/O for Industrial Automation

Mixed digital I/O modules provide an efficient way to connect both input devices and controlled loads at a remote point within a machine or automation system. The IMO IOS/M12BDD-D2 combines four DC digital inputs with eight transistor outputs, allowing sensor states to be monitored and compatible DC devices to be controlled through a single remote module.

Using Modbus RTU communications over RS-485, the IOS/M12BDD-D2 can be positioned close to field devices rather than requiring every signal to be individually wired back to the main controller. This can simplify control-panel architecture and field wiring while providing a flexible method of expanding digital I/O capacity in industrial automation systems.

Typical Applications

• Industrial machinery and automation systems.
• Remote sensor and actuator interfacing.
• Proximity switch and limit switch monitoring.
• Solenoid, indicator and compatible DC load control.
• Conveyor and material-handling equipment.
• Packaging and production machinery.
• Distributed PLC and Modbus remote I/O installations.
• OEM machinery and industrial control panels.