User Manual

Siemens Building Technologies VISONIK DCS Functions and System Messages VVS18 CM2U8567E / 04.1999
Landis & Staefa Division Function TRR 2-335
An updated Time Reaction is marked in a listing by an exclamation mark ("!"). The time
given in this message is the actual time and not the time at which the Reaction should
have taken place:
!TRR SC 16:40:09 a01'b2'SC SC =OFF--->ON RVAL=ON(1)
On changeover from summertime to wintertime a double pass is made through the hour
between 02:00 a.m. and 03:00 a.m. In this case Time Reactions are only executed
during the first pass and suppressed during the second pass.
On changeover from wintertime to summertime VISONIK automatically advances the
time from 02:00 a.m. to 03:00 a.m. All Time Reactions which should have taken place in
this skipped time will be executed, once only as described in the above Update Logic to
bring plant and TRR entries into agreement.
Every date is assigned a unique day of the week. For example, 25-Jan-1996 is a
Thursday. Therefore on this date all TRR entries which are specified to be activated on
a Thursday, will be carried out at the proper time.
But, if for some reason 25-Jan-1996 should be operated using a Tuesday switching
schedule then it must be declared as such in the Special Day Register.
Such an altered "Day of the Week" only has an effect on the scheduling of Time
Reactions. All other date/time dependent programs (e.g. Date Reactions, DRR) are not
influenced.
It may happen that all time-conditioned control situations cannot be clearly solved with
seven daily programs (e.g. special Reaction programs to account for days off and
holidays).
To cover this situation a further seven imaginary "Weekdays" have been incorporated.
These days can also be allocated to defined dates using the Special Day Register. Only
those Reactions as assigned to the corresponding 'Special Day' will be actioned.
Summertime/Wintertime
Changeover
Wintertime/Summertime
Changeover
Day(s) of the Week/
Special Day