EMG MCU 24.1 (commonly marked as MCU24-1.2) is a microcontroller unit control card launched by Germany EMG. It is integrated with a PROFIBUS‑DP fieldbus interface and specially designed for UMC 16 / SPC 16 systems. Applied to motion control and logic control in the field of industrial automation, this product has been discontinued by the original manufacturer and classified as a legacy spare part.
Core Functions
Main Control & OperationEquipped with an industrial-grade microcontroller to execute motion control algorithms, logic interlocks and closed-loop regulation, and support real-time task scheduling.
Fieldbus CommunicationIntegrated with a PROFIBUS-DP interface. Operating as a slave station, it enables high-speed communication with host PLC / master stations to transmit control commands, status data and diagnostic information, with a maximum communication rate of 12 Mbps.
I/O ControlProvides digital input and output channels compatible with sensors and actuators (such as solenoid valves and contactors), and supports processing of limit, emergency stop and fault signals.
System CompatibilitySpecifically developed for EMG UMC 16 / SPC 16 control systems, applied to web guiding correction, tension control, conveyor line synchronization and other industrial scenarios.
Status DiagnosisOnboard LED indicators display the real-time status of power supply, communication, operation and faults, facilitating on-site troubleshooting.
Technical Parameters
Model: MCU24-1.2 (MCU 24.1)Manufacturer: EMG (Germany)Product Status: Discontinued by ManufacturerFieldbus Interface: PROFIBUS-DP (DB9 connector)Power Supply: 24 VDC (±10%)Power Consumption: Typical 80 mAOperating Temperature: 0 ~ +55 °CStorage Temperature: -20 ~ +70 °CDimensions: Standard Eurocard (3U, 160 mm × 100 mm)Weight: Approx. 0.5 kg
Hardware Architecture
Processor16-bit industrial MCU with powerful real-time computing and interrupt processing capabilities.
Communication ModuleIndependent PROFIBUS-DP protocol chip with isolation protection for enhanced electromagnetic interference resistance.
I/O CircuitOptocoupler isolated input (24 VDC), relay / transistor output, equipped with overcurrent and overvoltage protection.
MemoryBuilt-in Flash for firmware and parameter storage; built-in RAM for data caching.
Interface LayoutFront Side: PROFIBUS-DP (DB9) interface, LED status indicators, reset button.
Rear Side: Gold finger connector (matching UMC 16 / SPC 16 backplane), I/O wiring terminals
Application Scenarios
Web Guiding Systems: Edge and center position correction control for web processing in papermaking, printing and textile industries.
Tension Control: Closed-loop tension regulation for metal and plastic film production lines.
Conveyor Synchronization: Speed synchronization and logic interlocking of multi-section conveyor lines.
Replacement & Spare Parts: Maintenance and component replacement for aging EMG UMC 16 / SPC 16 systems.
Frequently Asked Questions (FAQ)
Q: Is the MCU 24.1 still available for purchase?A: It has been discontinued by the original manufacturer. Only refurbished or stock spare parts are available through third-party component suppliers (e.g., Radwell), with relatively high prices and unstable lead times.
Q: Communication failure of the control card, PROFIBUS-DP indicator off?A: Troubleshooting steps:Check whether the 24 VDC power supply is normal and if the polarity is reversed.Verify PROFIBUS-DP wiring (DB9 pin 3 for positive, pin 8 for negative) and correct terminating resistor settings (switched ON at the first and last nodes).Ensure the bus address and baud rate are consistent with the master station configuration.Check the gold finger for oxidation; clean and reinsert the module.
Q: No response from I/O outputs and loads fail to operate?A: Troubleshooting steps:Confirm the output type (relay / transistor) matches the load requirements.Check tightness of output terminal wiring and normal power supply for the load.Determine output status via LED indicators. If not triggered, check program logic; if triggered, measure output contacts or voltage for faults.
Q: Frequent crash or reset during control card operation?A: Causes and solutions:Power fluctuation: Install a voltage stabilization module or filter capacitor to ensure stable power supply.Electromagnetic interference: Optimize grounding connection, keep away from high-interference equipment such as inverters and motors, and use shielded cables for bus wiring.Firmware abnormality: Re-flash the original manufacturer firmware and restore factory default parameters.
Q: Can the MCU 24.1 be replaced with other models for legacy UMC 16 systems?A: There is no direct replacement model officially provided by the manufacturer. Optional solutions are as follows:Upgrade to EMG’s new-generation control system (e.g., eMOTION series), which requires reprogramming and rewiring.Third-party compatible solutions: Several automation manufacturers offer control cards with PROFIBUS-DP interfaces; hardware compatibility and software adaptation need to be verified on-site.
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