A Safety-related Transmission Method For A
New Railway Signalling System Based On An
IP-Network
Author(s)
M. Endo, T. Okada, D. Watanabe, K. Aimi, T. Kunifuji
& M. Matsumoto
Abstract
We have developed a signalling system which controls signal devices through an
IP-Network. This system consists of a Logic Controller (LC) and Field
Controllers (FCs) connected with optical cable. The LC is a safety-related device
located at the signal house. The LC generates the command data, and transmits
the data to the FCs through IP-Network. The FC is a safety-related device
equipped in each signal device, and controls the device based on the command
data from the LC. In the railway signalling system, high level of safety and
reliability are required. In this system, the transmission devices and protocol are
based on the general technologies. Therefore, we need to assume all kinds of
errors on the transmission devices, and the whole system must keep itself in safe
status even if the worst error occurs. In order to comply with the IEC62280-1,
we have developed a safety transmission protocol. Moreover, this system needs
to operate for 20 years without system down. We have defined the target of the
failure rate of each device less than 10-7/h. We measured the traffic limitation in
order to validate the reliability about the transmission between the LC and the
FC, and confirmed that the traffic is much less than the traffic limitation of the
transmission device. We have evaluated the safety and reliability of this system
with prototype system, and put this system into practical use at Ichikawaono
station on the Musashino line in February 2007.
Keywords: IP-Network, PON, safety, reliability, safety-related transmission.
Keywords
IP-Network, PON, safety, reliability, safety-related transmission.
Related Book
Other papers in this volume
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