08ES41

Statement:

A water sprinkler system is it be started when either humidity or temperature sensors activates. Grass is to be watered first for 4 second and then flowers will be watered for 10 seconds and at last trees are to be watered for 18 seconds since it is required to avoid drop in the water pressure

Declaration: I0.0 => Temperature sensorI0.1 => Humidity sensorM0.0 => Internal latchT33 => Timer delay for 4 seconds (Toff)T34 => Timer delay for 10 seconds (Toff)T35 => Timer delay for 18 seconds (Toff)Q0.0 => pump relayQ0.1 => Output relay for grassQ0.2 => Output relay for flowersQ0.3 => Output relay for trees

Operation:

1T0.2

1T0.1

1T0.0

0M0.0

0I0.1

0I0.0

:conditions initial

====

==

1Q0.1 and 1Q0.0 thus1T331,M0.0 and

countdownstart timersall then 0M0.0

1 I0.1or I0.0

:when

=====

=

1

EN Toff

PT 100ms

EN Toff

PT 100ms

EN Toff

PT 100ms

I0.0

I0.1

M0.0

M0.0

M0.0

T33

Q0.1

Q0.2

Q0.3

T33

T33

T34.

T34

T35

T35

40

140

320

M0.0

M0.0

Ladder Logic

T34

M0.0 Q0.0

08ES41

1Q0.2 then 11T34&1T33

0Q0.1 thus0T33&1M0.0

:sec 4After

====

===

1Q0.3 then 1T35&1T34 and

0Q0.2 thus0T34&133 T

:sec 14After

===

===

0Q0.3 thus0T35& 1T34

:sec 32after

===

timersallreset will1M0.0 and

0M0.0 then 0I0.1&I0.0en instant whany at

=

==

2

M0.0

Q0.0

Q0.1

I0.0

M0.0

M0.0

I0.1 I0.2 M0.0 I0.3 I0.4 M0.1

M0.1

M0.1

I0.2 M0.1 I0.3 I0.4 I0.5

I0.5

08ES41

Three phase ac motor bidirectional operation:

Schematic:

Ladder logic:

3

08ES41

DeclarationI0.0 => forward switchI0.1 => reverse switchI0.2 => stop switch (safe mode)M0.0 => internal latch 1M0.1 => internal latch 2Q0.0 => forward power latchQ0.1 => reverse power latchI0.3 => overheat relay 1I0.4 => overheat relay 2I0.5 => overheat relay 3

Operation:• Initially reset pin used as NC(normally closed). And no input is applied at forward

or reversed pin. Thus motor will remain stop.• As forward switch pressed M0.0 enables and latch forward network and also

disable the reversed network .thus there is no effect of forward or reverse signal on both network.M0.0 enable output relay named Q0.0

• When reset signal applied it exploit latching circuit for both networks.(forward & reversed network)thus stops motor.

• As reversed signal applied M0.1 enables and latch reversed network and also disable forward network. Thus there is no effect of forward or reverse signal on both network.M0.1 enable output relay named Q0.01

• There are three overheat sensors (connected in safe mode configuration) in series of both network if any line overheated then whole system will top.

4