MH50C - menTCS Vital System Controller

MH50C is a central controller of the modular Train Control System menTCS. It is a modular system platform usable for safety-critical train applications like train control, automatic train operation (ATO) and automatic train protection (ATP) up to SIL 4 (EN5012x) or SIL3 (IEC61508).

Modular, Built-to-Order I/O Configuration

Being based on modular 40 HP CompactPCI, the system is always configured with a safe system CPU, a real-time Ethernet card, a power supply unit and a shelf controller. Other cards are added as built-to-order (BTO) options or by the user. The safe I/O cards support the common I/O requirements requested in trains.

The composition of safe CPU card, safe train I/Os and interfaces, such as MVB, CAN or serial interfaces to connect to legacy train equipment makes the controller ideal for use in safety-critical rolling stock applications.

Application-Ready, Open Platform

The MH50C is an application-ready, open platform. This means that the user adds his application based on the basic operating system and driver software.

Part of menTCS Train Control System

menTCS is a modular SIL 4 certifiable family of CompactPCI-based standard products usable for every kind of safety-critical railway application - from a single function to the main control system of the train. It can be configured to control anything in the train that requires functional safety - with requirements from SIL 1 up to SIL 4.

menTCS communicates via standard real-time Ethernet and can be configured to interface to any type of consist fieldbus network like MVB, CANopen, Profinet etc. This makes it easy to integrate into a TCN network as well as into regionally different Train Control Systems like ETCS, CTCS, ATCS or Klub-U. The high level of flexibility of menTCS results in significant cost and time savings during computerization of the train.

Certification and Standards Compliance

menTCS components come with certification packages and complete support for the safe operating system QNX, including safe protocols, and provides the technical possibility to run a safety PLC, again saving cost and time for implementation and for certification of the final system. menTCS is developed according to EN 50128 and EN 50129 standards and complies with the environmental requirements for railway applications: temperature class TX, shock, vibration, humidity, dust, isolation, PSU hold-up times, EMC regulations etc.

Mounting and Cooling Options

The system can be wall or rack-mounted, and is cooled using an additional fan tray at the bottom of the system. Cooling is independent of the mounting position.


  • For Applications up to SIL4 (EN5012x) or SIL3 (IEC61508)
  • Certified safe CPU board with 3 CPUs
  • Safe I/O boards
  • QNX safe operating system available
  • Certification packages available
  • Extensible by distributed safe I/O boxes connected via real-time Ethernet
  • Optional MVB, RS232, RS422, RS485, CAN, GPS
  • Compact 40 HP application-ready system
  • Rack-mounted or wall-mounted
  • For rolling stock and wayside applications


General System Characteristics
CPU Board
  • CPCI 3U Board
  • Configurable: no
  • 3x Intel Atom E680T (1.6 GHz), 2x 512 MB, 1x 1 GB DDR2 DRAM, 6 HP, front: 1 VGA, 2 USB, 2 Fast Ethernet (RJ45), -40°C to +85°C, air-cooled, conformal coating
  • Mass Storage
    • SSD mSATA, 8 GB, -40 to +85°C
Real-Time Ethernet
Safe I/O
MVB Multifunction Vehicle Bus
Serial I/O
Power Supply
Supervision and Control
Dedicated shelf controller monitors power, CPU status, temperature; controls fan; provides status LEDs and power button
Electrical Specifications
  • Supply voltage
    • 24 V, 36 V, 48 V, 72 V, 96 V, 110 V DC nominal; 14.4 to 154 V max. (EN 50155)
    • Power interruption class S2 (10 ms) (EN 50155)
  • Power consumption
    • 60 W typ. (barebone configuration and 2x K1, 2x K2, 2x K7)
    • 100 W max.
Mechanical Specifications
  • Dimensions
    • (W) 214 mm, (D) 225 mm, (H) 175 mm max. without brackets
    • 4U, 40 HP
  • Mounting Possibilities
    • Wall-mount, or
    • Rack-mount in 19" cabinet
    • Two systems side-by-side to build a single 19" chassis
  • Weight
    • 5.7 kg (barebone configuration and 2x K1, 2x K2, 2x K7)
Environmental Specifications
  • Classification for railway applications
    • EN 50155: Rolling stock, vehicle body
    • EN 50125-3: Wayside, at least 3 m off the track inside a switch box
  • Temperature range (operation):
    • -40°C to +70°C, with up to +85°C for 10 minutes (EN 50155, class TX; EN 50125-3, low temp. class T2, high temp. class TX)
  • Temperature range (storage): -40°C to +85°C
  • Cooling concept
    • Air-cooled, natural convection, or
    • Air-cooled, forced convection with fan tray at system bottom
  • Humidity
    • EN 50155: Rolling stock, vehicle body
    • EN 50125-3: Wayside, at least 3 m off the track inside switch box
  • Vibration/Shock
    • EN 50155: Rolling stock, vehicle body class B
    • EN 50125-3: Wayside, at least 3 m off the track
  • Altitude: -300 m to +3000 m
  • Conformal coating of board components
  • International Protection Rating (IEC 60529): IP20
  • Pollution Degree: PD 2
  • Useful life: 20 years (EN 50155:2017, class L4)
  • Functional Safety
    • Certifiable up to SIL 4 according to EN 50129/EN 50128 and up to SIL 3 according to IEC 61508, depending on I/O board configuration
    • Hazard rate for safety functions <= 1E-9 / h
    • System maintains safe state after a failure
  • Electrical Safety
    • EN 60950-1: Class I equipment
  • Flammability (PCBs)
    • UL 94 V-0
  • Fire Protection
    • EN 45545-2, hazard level HL3 (19MH50CB0 barebone configuration)
  • EN 50155: Rolling stock, vehicle body
  • EN 50121-4: Wayside at least 3 m off the track
Software Support


Short-form Data Sheet
User Manuals
Technical Drawings
Application Notes
Errata & Technical Information
Product Comparison
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