Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 198 of 265
Time switch Event Default State (i.e. when no time switch events are active)
26.3.1 Input active Input normal operation (following external influence)
26.3.1 Input inactive Input normal operation (following external influence)
26.3.1 Output active Output normal operation (following controller influence)
26.3.1 Output inactive Output normal operation (following controller influence)
26.3.2 Maximum Green Maximum green timeset A and Priority Set 0 selected.
26.3.3 Sign ON Sign will be OFF
26.3.3 Sign OFF Sign will be ON
26.3.4 Delete Phase Phase not deleted
26.3.4 Delete Stage Stage not deleted
26.3.5 Part Time Not Part time (i.e. signals illuminated normally)
26.3.6 Conditioning Flag Special Conditioning flag will be false
26.3.7 DFM timesets DFM timeset 0 selected
Table 22 – Time Switch Event Default States
26.5 Holiday Clock
26.5.1 Introduction
The basic timetable allows events to be introduced at certain times on certain days
of the week. See the description of the ‘day code’ in section 26.1. These events
would normally occur on the same day and at the same time every week.
The Holiday Clock facility allows the operator to predefine days during the year
when the normal timetable events should not run.
Example:
Consider a controller in which the normal timetable events request CLF plans in
order to provide a linked method of control during the rush hours. The Holiday Clock
facility can be used to define holidays when the volume of traffic is expected to be
lower and so the controller is required to remain isolated and not run the CLF plans.
The Holiday Clock facility provides:
 Special Holiday Periods that allow ranges of dates to be configured during which
an alternative set of timetable events run.
 Special Days that allow specific dates to be selected on which different timetable
events can be configured to run.