Specifications
ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 200 of 265
26.5.3 Special Days
The Holiday Clock facility allows specific individual dates to be defined when the
normal timetable events should not run, e.g. Bank Holidays. Currently, up to 64
special days can be configured in advance. For each Special Day, a date and a day
code is defined...
Day Codes 15 to 99
If the specified day code is not one of the normal timetable day codes (see section
26.1), only timetable events that use that exact day code number run on that specific
date.
For example, specifying day code 20 and the date 25-DEC-XX means that only time
switch events with day code 20 would run on December 25
th
every year.
The controller ignores the special holiday periods in this case and thus the above is
true even if the configured date falls within a configured special holiday period.
Day Codes 0 to 15
If the specified day code is one of the normal day codes that runs on just one day of
the week (see section 26.1), effectively the specified date is turned into the specified
day of the week.
For example, specifying day code 1 and the date 30-AUG-99 (which was a Bank
Holiday Monday in the UK) means that the controller would actually process the
timetable as though it were a Sunday (since day code 1 is normally the configured
day code for Sunday, see section 26.1).
Therefore, on Monday August 30
th
1999, the controller would not run the normal
timetable events for a Monday, but instead would run the normal time switch events
for a Sunday. The controller will then go on to examine the Special Holiday Periods.
If Monday 30
th
August 1999 is outside all the holiday periods, time switch entries
with the following day codes will run:
1 Sunday outside a holiday period
7 Every day outside a holiday period
201 Every Sunday
207 Every day
However, if Monday 30
th
August 1999 is within one of the holiday periods, time
switch entries with the following day codes will run:
101 Sunday within a holiday period
107 Every day within a holiday period
201 Every Sunday
207 Every day