Train Control and Management System (TCMS)

TCMS, often also called “brain of the train” controls, monitors and manages different on board train equipment, e.g. doors, traction, HVAC, etc. Some also integrate passenger information systems (PIS).
Advantages of a TCMS are:
– distributed functionality
– simplified cabling
– redundancy
– modularity
The use of industry standard protocols for communication and data exchange open the system, i.e. provides the capability to integrate third party devices or modules.

 TCMS Operation Module


TCMS can also include safety-relevant functions for the vehicle control.
According to current EU legislation, new or modified devices with safety relevant functions have to be designed according to the EN 50126 standard in order to receive a defined Safety Integrity Level (SIL) certification.



TCMS is mainly composed of PLC devices (programmable logic controller), remote I/O modules, communication gateways and user interfaces.
TCMS components are connected through a bus link.
The TCN (train communication network), in accordance with International Standard IEC 61375, uses different topologies, protocols, performances (WTB, MVB, ETH, CAN, RS485).
The customer can self-build or adapt the application with a software tool.

SoftPLC for TCMS

The RaPLC family provides devices and I / O modules for the implementation of trainborne automation solutions. Saira Electronics proposes a common SoftPLC Engine, with its development tool, training and support.

PRISMA T5 SoftPLC runtime onboard allows full access to all communication interfaces and I/O modules. PRISMA IDE is the software tool to develop specific applications; it is based on a standardized programming language and runs on a laptop PC.

IEC 61131-3 compliant (Programming Languages for PLC).


Vehicle Control Unit and Remote I/O

02_tcms-9The Vehicle Control Unit (VCU) is the main computer in the TCMS architecture.
It supervises the vehicle management applications, manages the communications, converts the protocol and provides format adaptation for information to be exchanged among all connected sub-systems. Additionally, VCU provides data logging for maintenance and diagnostics purposes.

Slots are available for integration of I/O boards of different configurations (digital, analogue, etc.)
Additional, remote I/O modules (RIOM) can be added for huge I/O handling and cabling simplification.

Interfacing capability includes MVB, Ethernet, RS232/RS422, CAN, USB.
EN 50155 compliant.
Power supply: 24/37.5/72/110 Vdc.


02_tcms-11IGW is a family of devices targeted for the inter- connection of several train and vehicle bus
(WTB, MVB, CAN, Ethernet).
Train bus is managed according to IEC 61375 standard; redundancy is implemented by means of 2 WTB nodes per vehicle.

It is possible to implement a sniffing function on the MVB, non-intrusive and with conversion to an Ethernet protocol.
EN 50155 compliant.

Power supply: 24 to 110 Vdc.

Ethernet Switch


Range of devices covering both ETH backbone and Consist operation.
Layer3 / Layer 2 routing switching.
Ethernet switch with 10/100Base-Tx ports.

M12 rugged physical connectors.
MAXIMUM CABLE LENGTH: 100, (Cat 5. cabling). Redunded topologies supported.
EN 50155 compliant.
Power supply: 24 Vdc.

Human Machine Interface (HMI)

02_tcms-510.4” SVGA LCD Display.
Resistive touch screen.
2 x USB and 2 x Ethernet interfaces. Windows CE / Linux OS support
for customer application.
EN 50155 compliant.
Power supply: 24/37.5/72/110 Vdc.

Mobile Communication Gateway (MCG)

02_tcms-13Communication gateway between on-board train devices and ground stations/servers.
Equipped with different communication interfaces:
– Ethernet/ MVB ports for on-board systems

– Wi-Fi for hot-spot depot links
Services: FTP, SSH, SNMP agent, SMS alert. EN 50155 and IEC 61375-2-6compliant. Power supply: 24/37.5/72/110 Vdc.

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