Siemens LOGO! 8 Manual

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2 Setup and descriptionTime Switch FunctionEntry ID: 109745699, V1.0, 04/2017 10 Siemens AG 2017 All rights reserved1. Time-controlled switching on and offThe combination of different switching times expands the time switch function asfollows.Standard switching timeVia the week timer function block "B002 StandardTime”, the standard switchingtime is defined.Via the function block, it is set, on which weekdays and at which time the timeswitch function switches the output Q1 on and off.Event switching timeBy linking the week timer "B001 EventTime" and yearly timer "B008 EventDay"function blocks, an event switching time is defined.Via the function blocks, the date and time is set for when the time switch functionswitches the output Q1 on and off.Figure 2-5: Blocks for time-controlled switching on and off2. Suppress switching on at certain timesWith the yearly timers “B006 SummerBreak”, “B020 EasterBreak” and “B049WinterBreak”, a time period (e.g. holidays) can be defined during which the switch-on via the standard switching times is suppressed.With the weekly timer “B017 TimeLock”, it can be defined, on which weekdays andat which time the switch-on via the standard switching times is suppressed.The event switching times are not suppressed and continue to switch. This allows aplanned switch-on and off, despite the suppressed standard switching times.Figure 2-6: Blocks for suppressing standard switching times