Section 4
Page 4 - 28
MODEL 346 INSTALLATION AND OPERATION MANUAL
HA243821
Issue 5 Mar 98
4.12 TIMER CONFIGURATION
4.12.1 INTRODUCTION
Four timers are available for controlling recorder tasks. Each of these may be configured to be a periodic timer
(which outputs an internal trigger when it reaches its preset duration), or a clock timer (which outputs an internal
trigger when it reaches its preset date and time.) See section 3.4 for the listing of internal trigger controlled
functions.
CLOCK TIMERS
A clock timer follows the recorder clock time and date. An internal trigger output (TM1 to TM4) occurs when the
timer’s preset time and date occur. If the year is not entered (blank) the clock timer becomes a yearly repeat timer
at the time, day and month set. If the month is also blank, the clock operates as a repeat timer at the same time
and day every month.
If the day is also blank, the clock timer operates as a repeat timer at the same time every day. If the hour is also
blank, it becomes an hourly repeat timer at the same time every hour.
EXAMPLE
If the clock timer is set for 13:30 17, it will output an internal trigger at 1:30 PM on the 17th of every month.
If the clock timer is set for 13:30, it will output its internal trigger every day at 1:30 PM.
For a weekly timer, set a Clock timer with the complete time and date, for the first reset of a Period timer set to
10,080 minutes
PERIODIC TIMERS
A Periodic Timer starts when entered or when it is reset on command from an internal trigger. It outputs its own
internal trigger (TM1 to TM4) after reaching the preset duration. This trigger can be used to reset a periodic timer
making it a repeating interval timer.
Note...
The Clock Timer internal trigger can be used to reset the periodic timer at a specific time and date.
POWER LOSS EFFECTS
Upon power loss, the clock timer will continue toward its time/date. If the preset time passes while power is off, no
action can occur.
The period timer will re-synchronise to the next period-end after power is returned, if the power loss is for less than
2 hours. For example, if the period timer were configured, using its own internal trigger, and started to repeat
every hour on the hour, and if power were returned at 10:35; the timer would run for 25 minutes and then reset at
11:00.
If the loss of power is for more than two hours, the period timer will start again whenever power is restored.
