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6
Reliability of the Integrated Logical Controller
As a technique, it is generally known that the reliability of equipment can be
improved by the following methods.
- Reduce the number of parts
- Improve the quality of parts
- Reduce mechanical parts
- Make parts mutually independent so that failure of one does not cause
others to fail
In developing the LC, we focused on reducing the number of parts to
improve reliability.
Figure 5 shows the reliability block chart of the IP Network-based Signal
Control System and LC. The IP Network-based Signal Control System is
connected in series with the existing electronic interlocking device in order
to reduce the new development as much as possible. On the other hand, the
FCP and logic unit are integrated to the LC, and the LC processes what
the FCP and upper logic unit process. Use of the LC decreases the failure
rate to about 1/5 compared with the combination of an existing electronic
interlocking device and The IP Network-based Signal Control System. This
is the effect of the reduction of the number of parts as the S-LAN and Field
device controller are removed.
Fig. 5. Reliability Block Diagram
Moreover, the L2SW is added as one of the change points from the IP
Network-based Signal Control System to the LC. The addition of the L2SW
was examined as shown in Table 1.
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