Section 5; Wayside Interface Application; Introduction; Wayside Interface System - Siemens VIU-20 Installation And Instruction

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5.0

WAYSIDE INTERFACE APPLICATION

5.1

INTRODUCTION

Positive Train Control (PTC) is an automated control system for railways that ensures the safe
operation of trains using data communication between the various control entities that make up
the system. As part of a PTC system, the VIU-20 interfaces with the signals and switches on an
interlocking and compiles vital messages concerning signal aspect and switch position using the
Wayside Interface Unit (WIU) application. These messages are passed through the ITCM
system for transmission to any locomotive within radio range.
VIU
(WIU)
VIU
(WIU)
LAN
VIU
(WIU)

Figure 5-1 VIU Monitoring Switches and Signals in an Interlocking

5.2

WAYSIDE INTERFACE SYSTEM

A VIU Wayside Interface System consists of three major components:
• VIU (WIU)
Interoperable Train Control Messaging (ITCM)
•
• Train Management Computer (TMC)
The VIU-20 contains no replaceable parts. If the unit fails, replace the
VIU-20 but leave the ECD/Power connector installed. The newly
installed VIU-20 will obtain its configuration from the ECD.
SIG-00-07-11
Version No.: B.2

SECTION 5

WAYSIDE INTERFACE APPLICATION
Ethernet
VIU
(WIU)
LAN
Switch
Input
Lamp
Input
Switch
Input
WAYSIDE INTERFACE APPLICATION
ITCM
ITCM = Interoperable Train Control Messaging System
NOTE
5-1
SEPTEMBER 2012 (REVISED OCTOBER 2019)
11-11_ITC_WSDE_INTRFC
08-05-11