Bachmann DIO248 Modules

Technical Dossier

Product Details And Specifications

Bachmann DIO248 Series: Comprehensive Module Range and Technical Overview

The Bachmann DIO248 is a digital input/output module within Bachmann Electronic's MPC (Modular Process Controller) platform, widely deployed in heavy industrial environments including chemical processing plants, offshore oil & gas installations, hydroelectric power stations, and wind energy facilities. Bachmann's MPC architecture is a deterministic, real-time automation platform certified to IEC 61131-3, with a global installed base spanning Europe, Asia-Pacific, and the Americas. The DIO248 module provides 24 digital inputs and 8 digital outputs on a single backplane slot, making it a high-density I/O solution for process control and machine automation applications where rack space is a critical constraint. Its 24 VDC signal compatibility and optical isolation architecture make it suitable for electrically noisy industrial environments. The platform's modular backplane design allows hot-swap capability on supported controller configurations, reducing unplanned downtime in continuous-process industries.

The Evolution of DIO248 Architecture

Bachmann Electronic GmbH, headquartered in Feldkirch, Austria, introduced the MPC controller platform in the early 2000s as a successor to proprietary single-board control architectures. The DIO248 module belongs to the second-generation MPC I/O family, which standardized on a 24 VDC digital signal level and a high-speed internal backplane bus operating at deterministic cycle times as low as 1 ms. Early MPC I/O modules used parallel backplane communication; later revisions transitioned to a serialized internal bus, improving noise immunity and increasing the maximum number of modules per rack. The DIO248 is compatible with MPC210, MPC230, MPC240, and MPC265 CPU modules, as well as the SolutionCenter rack system. Firmware compatibility is managed through Bachmann's SolutionCenter engineering software, which enforces module-to-CPU version matching. As the MPC platform has matured, Bachmann has introduced successor I/O modules with higher channel counts and integrated diagnostics; however, the DIO248 remains in active use across legacy installations where backplane slot compatibility and existing wiring infrastructure preclude direct module substitution. Facilities operating DIO248 modules should maintain a documented spare parts inventory, as lead times for new production units can extend to 16–26 weeks through standard distribution channels.

DIO248 Full Catalog & Functionalities (SKU List)

The following SKUs represent the Bachmann MPC I/O module range compatible with or directly related to the DIO248 series. Modules are classified by function. All part numbers are Bachmann Electronic OEM references.

Digital Input / Output Modules

• DIO248 (200150-05-05): 24 DI / 8 DO, 24 VDC, optically isolated, single backplane slot
• DIO216: 16 DI / 16 DO, 24 VDC, balanced channel configuration for symmetric I/O applications
• DIO232: 32 DI / 8 DO, high-density digital input variant for sensor-intensive processes
• DIO248-R: DIO248 with relay output stage, 8 relay DO rated to 230 VAC / 2 A
• DI232: 32-channel pure digital input module, 24 VDC, for high-count discrete sensor arrays
• DO216: 16-channel transistor digital output module, 24 VDC / 0.5 A per channel
• DO208: 8-channel relay output module, 230 VAC / 5 A, for high-current actuator switching

Analog Input / Output Modules

• AIO288: 8 AI / 8 AO, ±10 V / 4–20 mA, 16-bit resolution, for precision process variable control
• AI208: 8-channel analog input, 4–20 mA / 0–10 V, 16-bit, for transmitter signal acquisition
• AI216: 16-channel analog input, 4–20 mA, multiplexed, for high-density sensor integration
• AO208: 8-channel analog output, 4–20 mA / 0–10 V, 16-bit, for control valve and actuator positioning
• AIO244: 4 AI / 4 AO mixed module, compact format for small-loop control applications

CPU / Controller Modules

• MPC240: Mid-range MPC CPU, IEC 61131-3, Ethernet, supports up to 16 I/O modules per rack
• MPC265: High-performance MPC CPU with redundancy support, dual Ethernet, extended memory
• MPC210: Entry-level MPC CPU for standalone machine control, single Ethernet port

Communication & Network Modules

• CAN232: CANopen master/slave communication module for fieldbus device integration
• PROFIBUS-DP Master: PROFIBUS DP master module for legacy field device networks
• ETH001: Additional Ethernet port expansion module for multi-network controller configurations

Power Supply Modules

• PS24V-10A: 24 VDC / 10 A rack power supply module, DIN rail or rack mount
• PS24V-20A: 24 VDC / 20 A high-capacity power supply for fully populated racks

Sourcing Hard-to-Find & Obsolete DIO248 Parts

Quality Control for the DIO248 Range

Each Bachmann DIO248 module processed by DriveKNMS undergoes a structured inspection and functional verification protocol. Visual inspection covers backplane connector pin integrity, PCB surface condition, and component-level assessment for capacitor degradation or relay contact wear on relay-output variants. Functional testing is performed using a Bachmann MPC240 or MPC265 test rack running SolutionCenter firmware, verifying all 24 digital input channels and all 8 digital output channels against specified 24 VDC signal thresholds. Optical isolation integrity is verified by applying test voltages at rated levels and measuring leakage current against IEC 61131-2 limits. Backplane bus communication is validated by confirming module enumeration, cyclic data exchange, and diagnostic register readback within the SolutionCenter environment. Modules that fail any test stage are quarantined and not listed for sale. Test records are retained and available upon request for quality-critical procurement processes.