Tojakus The connector between the vehicles is the pole UIC connector. Interfaces are listed by their speed in the roughly ascending order, so the interface at the end of each section should be the fastest. When total cost of ownership is considered, the cost of the hardware elements can be outweighed by additional engineering costs in the railways market with its small series. This is not due to the communication technology: Up to 32 addresses can be dynamically allocated. While the WorldFIP, CANopen, Lonworks Profinet are controlled by international manufacturer associations targeting a wide range of application, MVB was tailored to the rolling stock application, with the goal of plug-compatibility, and therefore allows no options. There is no inauguration, the addresses are statically allocated.
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The medium consists of a duplicated shielded twisted pair cable, which runs in the UIC cables between the vehicles. The connector between the vehicles is the pole UIC connector. Since connectors are exposed and can oxidize, a current pulse is applied at connection establishment to evaporate the oxide layer, called fritting. No repeaters are foreseen since vehicles in between can have discharged batteries.
A unique property of the WTB is the train inauguration Zugtaufe in which the newly connected vehicles receive an address in sequence and can identify the vehicle side called port and starboard like in the marine so that doors open on the correct side.
Up to 32 addresses can be dynamically allocated. When two train compositions join, the addresses are reallocated to form a new composition of vehicles with a sequential address. Vehicles without WTB node "conduction vehicles" are not counted. The frames have a maximum payload of bits. The WTB operates cyclically to provide deterministic operation, with a period of 25 ms, used mainly for the traction control.
The WTB also supports sporadic data transmission for diagnostics. The content of the periodic and sporadic frames is governed by the UIC standard. Multifunction vehicle bus[ edit ] The multifunction vehicle bus connects individual nodes within a vehicle or in a closed train set.
The plugs and sockets are the same as used by Profibus with two 9-pin Sub-D sockets per electrical device. There is no inauguration, the addresses are statically allocated.
The physical level is using transmissions at a 1. The maximum distance is determined on the restriction of a maximum allowed reply delay of This explains why MVB and FIP have similar operation cyclic and event-driven , only the arbitration method in case of multiple access differs, as MVB used a binary bisection mode relying of collision detection while FIP piggy-backed a "look-at-me" bit over periodic data.
The MVB frames are not compatible with IEC fieldbus frames as it omits most of the preamble synchronization which is not required if zero-crossing detection is possible. Alternate vehicle buses[ edit ] The MVB standard was introduced to replace the multitude of field buses in the train equipment.
While the WorldFIP, CANopen, Lonworks and Profinet are controlled by international manufacturer associations targeting a wide range of application, MVB was tailored to the rolling stock application, with the goal of plug-compatibility, and therefore allows no options. This was intentional as the fight between the field busses raged in the s and the decision of the IEC that any of the eight field busses was a standard did not help plug-compatibility.
This is not due to the communication technology: most devices implement the MVB protocol machine in a small area of an FPGA which is today anyhow present, and the costliest component remains the connector. But railways certification is costly and not always needed for uncritical applications such as comfort and passenger information.
When total cost of ownership is considered, the cost of the hardware elements can easily be outweighed by additional engineering costs in the railways market with its small series. This separation is not always observed. Additionally more and more components are added to rail vehicles that need far more bandwidth than any field bus can provide e. Still all the alternate vehicle buses are connected to the Wire Train Bus. Running FlexRay with 2.
Despite the similarities, no rail-manufacturer has considered FlexRay, since they valuated a common solution higher than a multitude of better busses.
Train communication network
IEC 61375 PDF