KT8 - menTCS Remote I/O Extension for 8 Cards

Safe Remote I/O for Train Control Systems

KT8 is a safe, remote I/O box inside the modular Train Control System menTCS.The modular system platform menTCS is usable for safety-critical train applications like train control, automatic train operation (ATO) and automatic train protection (ATP) up to SIL 4 (EN5012x) or SIL 3 (IEC61508).

Modular, Built-to-Order I/O Configuration

Based on modular 19" technology, KT8 provides eight slots for safe I/O cards, which can be configured as built-to-order (BTO) options. menTCS I/O cards support the common I/O requirements requested in trains. The KT series of systems provides scalable sizes of eight slots, six slots and four slots.

Part of the 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 - under SIL 4, SIL 3 or SIL 2 requirements. menTCS communicates via standard EtherCAT real-time Ethernet and interfaces 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.

Compact and Cost-Saving Remote I/O

Being modular and SIL 4 certifiable, the KT series reduces the certification risk and efforts. This makes both your system costs and project schedule predictable. All KT systems have a dedicated EtherCAT component, the I/O head, for interconnection of the boxes and power supply. This in turn reduces cabling. I/O functions can still be located close to the remote actors and sensors, with fast data transmission within the menTCS. The compact format with a maximum width of 40 HP and a reduced depth compared to standard 3U systems allows installation even where space is very restricted, simplifying retrofitting of older trains.

Certification and Standards Compliance Included

Safety-related menTCS components come with certification packages and complete support for the safe operating system QNX, including safe protocols, I/O framework etc. All menTCS components that are safety-relevant are developed according to EN 50128 and EN 50129 standards and comply with all environmental requirements of EN 50155 for rolling stock: 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, also on a DIN rail, and is air cooled.


  • For Applications up to SIL4 (EN5012x) or SIL3 (IEC61508)
  • Safe I/O boards
  • Certification packages available
  • Distributed safe I/O and controller boxes connected via real-time Ethernet
  • Support for QNX safe operating system
  • Compact 40 HP housing for remote locations
  • Full EN 50155 compliance
  • Rack-mounted or wall-mounted


I/O Head for Power Supply and Real-Time Ethernet
  • menTCS I/O Head
  • Configurable: no
  • K100 menTCS I/O head unit; PSU: 40 W, 3U 8 HP PSU, wide range input 24 to 110 V DC, output 12 V DC; front: 2 Fast real-time Ethernet (M12), power inlet connector, hex switches, status LEDs; rear: real-time Ethernet (EBUS); -40..+85°C, conformal coating
Front Interfaces
  • Ethernet
    • Two 4-pin M12 connectors, D-coded, 100BASE-T
    • Four link and activity LEDs (two per channel)
  • menTCS system control
    • Two hex switches to configure chassis ID
  • Power supply
    • One power inlet connector
    • One voltage status LED
  • Safe I/O
    • As configured using plug-in boards
Safe I/O
Supervision and Control
Output voltage supervision and thermal supervision
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
    • 16 W approx. (with 8x K1)
    • 58 W max.
Mechanical Specifications
  • Dimensions
    • (W) 210 mm, (D) 133 mm, (H) 133 mm without brackets and connectors
    • 3U, 40 HP
  • Mounting Possibilities
    • Wall-mount, or
    • Rack-mount in 19" cabinet, or
    • DIN-rail mounting
    • Two systems side-by-side to build a single 19" chassis
  • Weight
    • 1450 g (barebone configuration)
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, low temp. class T2, high temp. class TX
  • 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, airflow 0.5 m/s
  • Humidity
    • EN 50155: Rolling stock, vehicle body
    • EN 50125-3: Wayside, at least 3 m off the track inside a switch box
  • Vibration/Shock
    • EN 50155: Rolling stock, vehicle body class B
    • EN 50125-3: Wayside, at least 3 m off the track inside a switch box
  • Altitude: -300 m to +3000 m
  • Conformal coating of internal components
  • International Protection Rating (IEC 60529): IP20
  • Pollution Degree: PD 2
  • Useful life: 20 years (EN 50155:2017, class L4)
  • Functional Safety
    • Certifiable to SIL 1, SIL 2, SIL 3 or SIL 4 according to EN 50129, depending on I/O board configuration
  • Electrical Safety
    • EN 60950-1: Class I equipment
  • Fire Protection
    • EN 45545-2, hazard level HL3
  • EN 50155: Rolling stock, vehicle body
  • EN 50121-4: Wayside at least 3 m off the track (with external protection elements)
MTBF: 542 888 h predicted @ 40 °C according to IEC/TR 62380 (RDF 2000) (barebone configuration, without I/O boards)
Software Support