Page 107 - 捷運技術 第35期

捷運技術半年刊 第 35 期 95 年 8 月 99

system operations. The CCR communicates with the trains by means of the Train to Wayside
Communications（TWC）system. The TWC is a bi-directional communications system. The CCR is
informed of train location, identification and routing information. In turn, the CCR can send
information to the train such as performance levels（acceleration limits）, modifications of station
dwell times and changes in routing. The CCR communicates to the stations via a standard network
communications system. The station electronic signaling equipment then passes the information to
and from the trains via special bonds at the stations.

All the communications and logic of the three sub-systems above are controlled and integrated
by special purpose computers within the signal equipment rooms. These special purpose computers
are called VPIs. The VPIs are composed of modular components. This feature provides the
flexibility to read inputs, set outputs and process logic for a wide variety of applications as
demanded by the particular conditions required by the section of tracks which they control.

Many new enhancements are currently being introduced
to improve the reliability and efficiency of the Taipei Metro
signaling system. We will briefly introduce four of these new
developments：VDU control panels, the GM400A switch
machine, redundant VPI installations and the Platform Screen
Doors subsystem.

The VDU control panels provide operators with state of
the art control and indication of the metro system. These
systems are provided by our local signaling partner ACSI.
They consist of IBM compatible personal computer systems
equipped with LCD screens and special software. They
display the status of the controlled tracks and provide intuitive
control of all available functions. These systems replace the
electro-mechanical Local Control Panels previously used to
accomplish these functions. The VDUs are more reliable, less Typical Signal Equipment Room
expensive to operate and maintain, and are much easier to upgrade if required due to changes is
metro system design.

Typical VDU Screen