Embedded Solutions CompactPCI F301-3U Instrukcja Użytkownika Pobierz pdf (Strona 22)

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Fieldbus Solutions

Custom WTB Interface

This custom PC/104-Plus module is a fully

EN 50155 compliant WTB transmitter and

receiver interface for locomotive control. It

provides two independent channels with red-

undancy function. The WTB communication

controller is realized as an IP core in the on-

board FPGA. The WTB lines are accessible on

two D-Sub connectors at the front panel. The

transceivers are electrically isolated from the

line by a transformer. The signaling data rate

is 1 Mbit/s. The transmitter is a differential dri-

ver capable of sourcing a short circuit current

of 1A. Each transmitter provides a transmit

enable line and a feedback signal to the FPGA

to detect a shorted line.

A unique feature in train networks is “fritting“.

To overcome contact oxidation in relays and

connectors, a node may apply a very high DC

voltage between the wires X and Y of either

direction. The fritting source on this module

supplies a direct voltage of 48V -10/+20 %

measured at the connection points.

Together with the standard PCI-104 CPU

board PP1 (PowerPC

®

MPC5200) it realizes a

gateway from WTB to CAN bus.

32-bit/33-MHz PCI target

WTB function in FPGA

2 independent transmitter/receiver

channels

MVB Interface on PCI-104

Module PP4

The PP4 is an optically isolated MVB transmit-

ter and receiver interface with EMD (Electrical

Middle Distance medium) physical interface.

Versions with ESD (Electrical Short Distan-

ce medium) and OGF (Optical Glass Fiber

me dium) are available on request.

The PP4 provides master and slave functio-

nality and has one redundant MVB channel

(double line attachment conﬁ guration)

accessible via two 9-pin D-Sub connectors. It

is based on the Siemens ASIC MVBCS1 and

on an on-board FPGA. The functional device

classes 1, 2, 3 and 4 of the MVB can be conﬁ -

gured. The isolation voltage is 1500 V DC and

1000 V AC. The PP4 is fully compliant with

EN 50155.

32-bit/33-MHz PCI target

MVB transmitter/receiver

Master and slave interface

1 redundant channel

Isolated EMD (optionally ESD and OGF)

Up to 16 MB SDRAM, 2 MB Flash

...finally calm weather for travelling...no incidents.... ...... ……………fallen asleep.

The TCN Train Communication Network,

integrated into the IEC 61375 standard, was

developed together with UIC and describes

time and safety critical data transmission in

railway vehicles. Their goal is worldwide inter-

operability of different trains and equipment

via Plug and Play. The TCN architecture com-

prises a train bus and a vehicle bus.

The Wire Train Bus (WTB) operates at 1 Mbit/s

over a distance of 860 m on twisted wire

pairs. The WTB provides unique features such

as auto-numbering of vehicles and cleaning

action of the coupler‘s contacts.

The Multifunction Vehicle Bus (MVB) operates

at 1.5 Mbits/s over optical ﬁ bers and/or twisted

wire pairs.

The TCN busses provide two main trans-

mission services: deterministic transmission

of time-critical process data through perio-

dical source-addressed broadcast and on-

demand reliable transmission of messages

through either a point-to-point or a multi-

cast transport protocol. The TCN offers a

full 7-layer architecture and routes message

packets based on logical addresses. Network

management services support commission-

ing and maintenance.

TCN – From Train Bus to

Vehicle Bus

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 37 38

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