Operating Instructions

Siemens Industry, Inc. • 54 Siemens Application
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Timers
Timers can be used to set a Time Channel active during a certain time by command from a digital input
(or a Time Channel).
Figure 12. Activation signal comes from a digital input or "a virtual digital input" such as a Time channel.
The Timer counts down from falling edge.
The below parameters will set the Timer active when Digital Input 1 on Slot A is closed and keep it active
for 30 s after it is opened.
Duration: 30 s
Timer: DigIn SlotA.1
Tip: A duration of 0 seconds can be used for simply overriding a Time channel activated from a digital
input without any off delay after the falling edge.
EXAMPLE
Problem:
We have a variable frequency drive for air conditioning in a warehouse. It needs to run between 7am -
5pm on weekdays and 9am - 1pm on weekends. Additionally, we need to be able to manually force the
drive to run outside working hours if there are people in the building and to leave it running for 30 min
afterwards.
Solution:
We need to set up two intervals, one for weekdays and one for weekends. A Timer is also needed for
activation outside the office hours. An example of configuration below.
Interval 1:
P3.11.1.1: ON Time: 07:00:00
P3.11.1.2: OFF Time: 17:00:00
P3.11.1.3: From Day: ‘1’ (=Monday)
P3.11.1.4: To Day: ‘5’ (=Friday)
P3.11.1.5: Assign to channel: Time channel 1
Interval 2:
P3.11.2.1: ON Time: 09:00:00
P3.11.2.2: OFF Time: 13:00:00
P3.11.2.3: From Day: Saturday
P3.11.2.4: To Day: Sunday
P3.11.2.5: AssignToChannel: Time channel 1
9137.emf
Duration
Remaining
time
Activation
Time
OUT
9137.emf