UE LOGO!-Descripción de Funciones

Descripción Detallada de Funciones Conectores Funciones Generales Funciones Especiales-a Funciones Especiales-b

SIMATIC –Totally Integrated Automation F

Funciones Básicas (BF) AND

AND NAND NAND (Edge) (Edge)

Funciones Básicas SIMATIC –Totally Integrated Automation

OR

NOR

XOR

NOT

(BF) Operación Lógica AND Referring to the circuit diagram, it can be seen that lamp H1 illuminates only if S1 and S2 are both closed. There is a dependency between the input and output states.

S1

The circuit shown on the right is referred to as an AND logic operation.

S2

This means that switches S1 and S2 must be energized in order for lamp H1 to illuminate.

H1

Symbolically, this operation is represented by

. Circuito serie con cantactos NO

Tabla Lógica para bloque AND:

AND S1

Input 1

Input 2

Input 3

Output

0

0

0

0

0

0

1

0

0

1

0

0

0

1

1

0

1

0

0

0

1

0

1

0

1

1

0

0

1

1

1

1

&

S2 H1

x

The state of the AND output = 1 only if the state of all inputs = 1. An unconnected input pin in this block is automatically assigned state = 1.

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(BF) Operación Lógica OR For lamp H2 to illuminate, switch S3 or S4 must be closed. This dependency of the output state on the input states is referred to as an OR logic operation .

S3

This means that at least one of the two switches--S3 or S4--must be closed in order for lamp H2 to illuminate.

S4

H2

The symbol for this operation is Parallel circuit with normally open contacts

Logic Table for OR Block:

OR S3

>

S4 x

H2

The state of the OR output =1 if the state of  at least one input = 1. An unconnected input pin in this block is automatically assigned state = 0.

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Input 1

Input 2

Input 3

Output

0

0

0

0

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

1

(BF) AND con Evaluación de Flanco S1

S1 Electromechanical counter

S2

S2

0 6 1 5 S3

S3

H2

H2

AND with edge evaluation S1

The state of the output of the AND with edge evaluation operation = 1 only if the state of all inputs = 1 and the state of at least one input during the previous cycle = 0. An unconnected input pin in this block is automatically assigned state = 1.

&

S2 H2

S3

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(BF) Operación Lógica NAND Referring to the circuit diagram, it can be seen that lamp H2 is always illuminated, unless all of the switches are activated. S1

The circuit shown on the right is referred to as a NAND (Not And) logic operation . This means that switches S1, S2, and S3 must be activated in order for lamp H2 not to be illuminated. The symbol for this operation is

S3

S3

H2

. Parallel circuit with normally closed contacts

NAND (Not AND) S1

Logic Table for NAND Block:

&

S2 x

H2

The state of the NAND (Not AND) output = 0 o nly if the state of  all inputs = 1. An unconnected input pin in this block is automatically assigned state = 1.

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Input 1

Input 2

Input 3

Output

0

0

0

1

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

0

(BF) NAND con Evaluación e Flanco Electromechanical counter

S1 S1

S3

0 6 1 5

S3

S2

S3

H2

H2

NAND with edge evaluation S1

The state of the output of the NAND (Not And) with edge evaluation operation operation = 1 only if the state of at least one input = 0 and the state of all inputs during the previous cycle = 1. An unconnected input pin in this block is automatically assigned state = 1.

&

S2 H2

S3

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(BF) Operación Lógica NOR Referring to the circuit diagram, it can be seen that lamp H1 is illuminated only if n ormally closed switches S1 and S2 are not activated.

S1

The circuit diagram shown on the right is referred to as a NOR (Not OR) logic operation .

S2

This means that if at least one of the switches S1 or S2 is activated, lamp H1 is not illuminated.

H1

The symbol for this operation is

.

NOR (Not OR) S1

>1

Series circuit with normally closed switches

Logic Table for AND Block: Input 1

Input 2

Input 3

Output

0

0

0

1

0

0

1

0

0

1

0

0

0

1

1

0

1

0

0

0

1

0

1

0

1

1

0

0

1

1

1

0

S2 x

H1

The state of the NOR (Not OR) output = 1 only if the state of all inputs = 0. As soon as any input is switched on (state = 1), the output is switched off. An unassigned input pin in this block is automatically assigned state = 0.

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(BF) Operación Lógica XOR Referring to the circuit diagram, it can be seen that lamp H1 is not illuminated only if all of the switches are activated.

S1

The circuit diagram on the right is referred to as an XOR (Exclusive OR) logic operation .

S2

This means that if either switch S1 or switch S2 is activated, lamp H1 will illuminate. The symbol for this operation is

H1

.

XOR (Exclusive OR) S1

Logic Table for XOR Block:

=1 H1

S2

Input 1

Input 2

Output

0

0

0

0

1

1

1

0

1

1

1

0

The state of the XOR (Exclusive OR) output = 1 if the state of the inputs is different. An unconnected input pin in this block is automatically assigned state = 0.

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(BF) Operación Lógica NOT Referring to the circuit diagram, it can be seen that lamp H1 is only illuminated if switch S1 is not activated.

S1

The circuit diagram on the right implements a NOT logic operation. The symbol for this operation is

.

K1

H1

NOT (Exclusive OR) 1 S1

H1

The state of the output = 1 if the input = 0, that is, NOT inverts the input state. One advantage of the NOT operation is that normally closed contacts are no longer needed for LOGO! LOGO! A normally open contact is used and is converted to a normally closed contact with the NOT operation. An unconnected input pin in this block is automatically assigned state = 1.

SIMATIC –Totally Integrated Automation

Logic Table for NOT Block: Input 1

Output

0

1

1

0

Funciones Especiales On-Delay

Random Generator

On/Off Delay

Multifunction Switch

Threshold Switch Pulse Relay

Edge-Triggered Internal Time-Delay Relay

Off-Delay Pulse Relay

Elapsed Time Counter

Staircase Lighting Time Delay

Yearly Timer Internal Time-Delay Relay Message Text

Analog Comparator

Analog Threshold Switch

Clock Pulse Generator

Weekly Timer Retentive On-Delay

Funciones Especiales

Softkey

Up/Down Counter

Latching Relay

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(SF) On-Delay Referring to the circuit diagram, it can be seen that the motor starts running only after the set time delay expires.

S1

K1

on-delay. This function is referred to as an on-delay. This means that the motor is s witched on after a set time delay. The symbol for this function is

K1

.

M

Diagram: Trg Q T

T

Ta (Timer active)

Function Description: If the state at input Trg changes from 0 to 1, the timer starts running. If the state at input Trg =1 for a sufficient amount of time, the output is set to 1 once time T expires. There is a delay in switching on the output as compared to the input. The output is reset to 0 if the state at input Trg = 0. If the state at input Trg changes back to 0 before time T expires, the timer is reset. The expired timer is reset after a power failure.

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(SF) Off-Delay Referring to the circuit diagram, it can be seen that the motor is switched off only after the set time delay expires.

S1

K1

off-delay. This function is referred to as an off-delay. This means that the motor is switched of after a set time delay. The symbol for this function is

.

K1

M

Diagram: Trg T

T

Ta R

Q (Timer active)

Function Description If the state at input Trg = 1, the state at output Q switches immediately to 1. If the state at input Trg changes from 1 to 0, the timer in LOGO! is activated and the output state is retained. When the timer reaches the value set using T (Ta =T), the state at output Q is reset to 0. If the input Trg is switched on and off again, time Ta is restarted. Time Ta and the output are reset using input R (reset) before time T expires.

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(SF) On/Off-Delay Referring to the circuit diagram, it can be seen: • If S1 is closed closed,, contact contact K1 closes closes after after a time time delay and and the motor runs.

S1

K1

K2

• If S1 is is opened, opened, contact contact K2 opens opens after after a time time delay and and the motor stops. delay. This means This function is referred to as an on/off delay. that the motor is switched on and off after a set time delay. The symbol for this function is

.

K1

K2

Diagram: Trg Q TH

TL

Function Description If the state at input Trg changes from 0 to 1, time TH runs. If the state at input Trg remains 1, the output is set to 1 once the time TH expires. If the input state changes back to 0, time TL runs. If the state at input Trg remains 0 for the duration of time TL, the output is set to 0 once time TL expires.

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M

(SF) On-Delay Retentivo Referring to the circuit diagram, it can be seen that motor M runs after a se t time delay following activation activation of momentary-contact pushbutton S1. Momentary-contact pushbutton S2 (normally closed) causes the motor to switch off again.

S1

K2

K1

K1

S2

on-delay. This function is referred to as a retentive on-delay. The symbol for this operation is

K1

.

K2

M

Diagram: Trg R Q T

Ta

Function Description: If the state at input Trg changes from 0 to 1, the current time Ta starts running. When time Ta reaches time T, the state at output Q is set to 1. Output Q is reset to 0 only when the state at input R = 1. Further switching actions at input Trg have no influence on output Q.

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(SF) Relé con Auto-enclavamiento Referring to the circuit diagram, it can be seen that coil K1 is energized with momentary-contact pushbutton S1, causing maintained-contact maintained-contact switch K1 to close (latching).

S1

K1

K1

relay. This function is referred to as a latching relay. The symbol for this operation is

S2

.

K1

Diagram:

S R

Q

Function Description Output Q is set by means of input S; output Q is reset by means of a second input R.

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K2

M

(SF) Relé de Pulso (Toggle) Referring to the circuit diagram, it can be seen that lamp H1 can be switched on and off with momentary-contact pushbuttons S1 or S2. relay. This function is referred to as a pulse relay. This means that lamp H1 is switched on and off by a brief pulse in S1 or S2, respectively. The symbol for this operation is

S1

.

S2

K1

H1

K1

Diagram:

Trg R

Q

Function Description Each time that the state at input Trg changes from 0 to 1, output Q changes its state, i.e., the output is switched on or off. The state of the latching relay is set to 0 using input R.

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(SF) Intervalo-Delay Relé/Salida de Pulso Referring to the circuit diagram, it can be seen that lamp H1 is illuminated only if maintained-contact maintained-contact switch S1 is closed, but at most for the time period set on timer T1. The symbol for this operation is

S1

.

T1 T1

H1

Diagram: Trg Ta

Q

Function Description If the state at input Trg = 1, the state at output Q immediately switches to 1. Simultaneously, Simultaneously, the current time Ta starts in LOGO!, and the output setting is retained. When Ta reaches the value set using T (Ta =T), the state at output Q is reset to 0 (pulse output). If the state at input Trg changes from 1 to 0 before the specified time expires, the state at the output also changes immediately from 1 to 0.

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(SF) Intervalo delay Relé por Flanco Referring to the circuit diagram, it can be seen that lamp H1 illuminates for a period of time set in timer T1 when maintainedcontact switch S1 is activated. The symbol for this operation is

S1

T1

. T1

T1

H1

Diagram: Trg Ta

T

T

Q

Function Description If the state at input Trg = 1, the state at output Q switches to 1. Simultaneously, time Ta starts. When time Ta reaches the value set using T (Ta=T), the state at output Q is reset to 0 (pulse output). If the state at input Trg changes back from 0 to 1 before the specified time expires (retriggering), (retriggering), time Ta is reset and the output remains switched on.

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(SF) Temporizador Semanal The output is controlled by means of an a ssignable on and off date. Any combination of weekdays is supported. Active weekdays are selected by removing inactive weekdays. Lu Ma Mi Ju Vi Sa Do

On

Off

Cam1

07 : 30

16 05

Cam2

08 : 00

12 00

Cam3

10 : 00

12 30

 

Wednesday

Monday

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Function Description Each weekly timer has three cams which can be used to assign parameters for each time window. The on and off times are specified using the cams.

(SF) Termporizador Anual Function Description Each yearly timer has an on and off time. The yearly timer switches the output on at a specified on time and switches it off  at a specified off time. The off date identifies the day when the output is to be reset to 0.

Jan

Feb Mar Apr May Jun

Jul Aug Sep Oct Nov Dec

On May 10

Off Oct 20

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(SF) Contador Up/Down Referring to the circuit diagram, it can be seen that the time pulse is generated with maintained-contact maintained-contact switch S1. Maintained-contact switch S2 determines whether whether the counter counts up or down. If  the counter content has a value >= 10, the lamp is switched on.

S1

S2

R Cnt Dir Par

-

C1

+

>=5

Q

Function Description For every rising edge at input Cnt, the internal counter counts up by one (Dir = 0) or down by one (Dir = 1). If the internal counter value is equal to or greater than the value specified using Par, output Q is set to 1. The internal counter value and the output can be reset to 0 using input R. As long as R = 1, the output is 0, and pulses at input Cnt are not counted.

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H1

Diagram: Cnt Dir

6 5 4 3 2

6 5

5 4 3

3

4 3 2

2 1

1 0

Contador R Q

0

(SF) Contador de Horas de Operación R En Ral Q MN = MI

3

3 2

2 1

1 0

MN = 0

0

4 3 2

Function Description

1

OT

En.. As long as the value at this input = 1, The elapsed time counter monitors input En MN.. LOGO! indicates the times in parameter assignment LOGO! quantifies elapsed time OT and the remaining residual time MN mode. If the remaining residual time MN = 0, output Q is set to 1. The reset input R is used to reset MI.. Internal counter OT resumes counting. output Q and to set the counter for the residual time to the specified value MI MI.. The reset input Ral is used to reset output Q and to set the counter for the residual time MN to the specified value MI The internal counter OT is reset to 0.

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(SF) Generador de Pulsos Simétrico Referring to the circuit diagram, it can be seen that lamp H1 flashes with a pulse time set using a clock pulse generator when maintained-contact maintained-contact switch S1 is activated. The symbol for this operation is .

S1

H1 G

Diagram:

En Q

T

T

Function Description Parameter T is used to specify the length of the on and off time. En (Enable) is used to switch the clock pulse generator on. The clock pulse generator sets the output to 1 for time T, and then to 0 for time T, and so on, until EN = 0 at the input. The time T specified must be > 0.1 seconds at all times.

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(SF) Generador de Pulsos Asíncrono The pulse form of the output can be modified by means of the assignable pulse/pause ratio. The symbol for this function is

.

Diagram:

En

Inv

Q Pulse length/ Pause Pause length

Function Description Pulse length and pause length can be set by means of parameters. The time base can be divided into seconds, minutes, or hours. Both parameters have the same time basis, and a different setting is not possible. Input Inv causes the output to be inverted if the block is enabled by means of EN.

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(SF) Generador Aleatorio The random generator switches the output on or off  within an assignable time. The symbol for this function is

.

Diagram:

En

Q

Q Maximum On-Delay/Maximum Off-Delay

Function Description If input En changes from 0 to 1, a random time of between 0 and 10 seconds is started. If En =1 for at least the duration of the on-delay time, the output is set to 0 when the on-delay time expires. If the state at input En changes back to 0 before the on-delay time expires, the time is reset. If input En changes from 1 to 0, a random time (off-delay time) of between 0 and 15 seconds is started. If En = 0 for at least the duration of the off-delay time, the output is set to 0 once the off-delay time expires. If the state at input En changes to 1 before the off-delay time expires, the time is reset.

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(SF) Switch de Umbral de Frecuencia The output is switched on and off depending on two assignable frequencies. The symbol for this function is .

Diagram:

F re re > SW On On

F re re > SW of of f

Fr e < SW SW Of Of f  

Fre = 5

Fre = 3

Fre < SWOn

Q Fre =12

Fre = 5

Fre Ventana

Function Description The threshold switch measures the signals at input Fre. The pulses are detected over an assignable time period (peak time). If during the peak time, the measured values are greater than the upper threshold value, output Q switches on. Output Q switches off again when the measured values are less than the lower threshold value. SWOn is the on threshold. The permitted range is 0000 to 9999. SWOff is the off threshold. The permitted range is 0000 to 9999. Peak time is the time interval during which the pulses at Fre are measured. The permitted range is 0.05 seconds to 99.95 seconds.

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(SF) Delay Alumbrado de Escalera An assignable time runs following an input pulse (edge triggering). The output is reset after the time expires. An early shutdown warning is issued 15 seconds before the time expires. The symbol for this function is

.

Diagram:

Trg

Ta

T (Off-delay)

1s

Q 15 s

Function Description If the state at input Trg changes from 0 to 1, the current time Ta runs and output Q is set to 1. Fifteen seconds before Ta reaches time T, output output Q is reset to 0 for 1 second. second. If Ta reaches time T, output Q is reset to 0. Further switching actions at input Trg while Ta is running resets Ta (retrigger option). option).

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(SF) Switch Multifunción Switch with two different functions: · Pulse switch with off-delay off-delay · Switch (steady light) light) The symbol for this function is

Diagram:

. Trg

Q 5s

>20 s

Function Description If the state at input Trg changes from 0 to 1, output Q is set to 1. If input Trg changes back to 0 before the steady light time expires, the output is reset to 0 after a time delay of 5 seconds. If the state at input Trg changes from 0 to 1 and remains 1 for at least 20 seconds, the steady light function is enabled and output Q is switched on for the duration. Further switching actions from 0 to 1 and back to 0 at input Trg causes output Q to switch off.

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(SF) Message Text Display of an assigned message text in RUN mode. The symbol for this function is

.

Function Description If the input state changes from 0 to 1, the appropriate message text is output on the display during RUN mode. If the input state changes from 1 to 0, the message text is removed. If more than one message text has been triggered with En=1, the highest priority message is displayed. It is possible using the keys to toggle between the standard display and the message text display. If If “acknowledge message“ is selected, selected, the corresponding corresponding message text is removed only after pressing a button on LOGO!, provided En = 0.

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SIEMENS I : 0. , 1. , 2. 123456789 Motor on 0123456789 1 in 2 2Alarm! 3 min 4 01234 01:15 m Pressure in %

LOGO

95.0

ESC

OK

(SF) Switch de Umbral Análogo Diagram

Function Description The output is switched off if the analog value exceeds an assignable on threshold. The output is switched off if the analog value is less than an assignable off  threshold (hysteresis). The function reads analog value AI1 or AI2. The offset parameter is then added to the analog value. This value is then multiplied by the gain parameter. If this value exceeds the on threshold (SW↑ (SW↑), output Q is set to 1. Q is reset to 0 if the value falls b low the off threshold (SW ↓). Note: In the effective range, the minimum and maximum must be assigned the same one‘s digit.

Pinout

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(SF) Comparador Análogo Function Description This function generates the difference between the analog values Ax and Ay. The offset parameter is then added to the difference. The difference is then multiplied by the gain parameter. If the difference of this value exceeds the assigned threshold, output output Q is set to 1. Output Q is reset to 0 if the valued falls below the threshold again.

Diagram

Pinout

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(SF) Softkey Function Description

Diagram

This logic function works like a mechanical momentary-contact momentary-contact pushbutton or a maintained-contact maintained-contact switch. If input En is set and the “switch“ parameter is switched to “On“ and confirmed with OK in parameter assignment mode, the output is switched on. Whether the function was configured as a maintained-contact maintained-contact switch or a momentary-contact momentary-contact pushbutton is irrelevant. The output is reset to 0 in the following three cases:

En

Q

Par

• If the state at input En changes from 1 to 0. • If the function was configured as a momentary-contact momentary-contact pushbutton and a cycle has run since it was switched on. • If the “Switch“ parameter parameter was switched to “Off“ and confirmed with OK in parameter assignment mode.

Pinout

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