Programabilni Logički Kontroleri PLC

Programabilni Logički KontroleriPLC

1. PLC hardware

2. PLC programiranje i način funkcionisanja

3. PLC programske funkcije

4. Diskretne I/O funkcije i uređaji

Uvod

• PLC je digitalni elektronski uređaj projektovan da upravlja mašinam i/ili procesima primenjujući sekvencijalno (vremensko ili vođeno događajima) upravljanje.

• PLC je dizajniran za upotrebu u teškim industrijskim uslovima. Može se programirati bez posebnih znanja programiranja i može ga održavati tehničar za održavanje fabrike.

• Neke od prednosti PLC-a su:

1. Fleksibilnost. Jedan PLC može da obradi mnogo različitih operacija. Softverske izmene se lakše implementiraju od hardverskih.

2. Pouzdanost. Solid-state uređaji su pouzdaniji i lakši za održavanje od mehaničkih releja i tajmera.

3. Niža cena. Bazira se na činjenici da poluprovodnička tehnologija (procesori) omogućuje implementaciju složenih funkcija i složenih izračunavanja po veoma niskoj ceni.

4. Dokumentacija. Iz softvera za programiranje je moguće direktno iscrtati šeme regulacionih krugova. Nema potrebe za posebnim crtanjem određenih crteža koji postaju zastareli istog trenutka čim se izvrši neka izmena.

PLC hardware

PS(opcija)Napajanje

CPUProcesor

IM(opcija)Interfejs

SM:DI

SM:DO

SM:AI

SM:AO

FM:- brojanje- pozicija-Zatvorenapovratna petljaFunkcijiskiModuli

CP:- Point-to Point- PROFIBUS- Industrial EthernetSignalni Moduli

PLC hardware

CPU 314 until Oct. 2002 CPU 314 after Oct. 2002

PLC hardware

S7-400 Automation System

PLC programiranje i funkcionisanje - Ladder Diagram

• LD (Ladder – Lestvičasti Diagram) programski jezik koristi simbole kontakata za formiranje dijagrama koji su veoma slični kontaktorskim šemama.

• Simbol za normalno otvoreni kontakt podseća simbol za električni kondenzator.

• Simbol za normalno zatvoren kontakt je isti kao za otvoreni kontakt sa dijagonalnom linijom preko.

• Simbol za izlaz se sastoji od dve male zagrade.

• Svaki kontakt i izlazni simbol ima broj upisan odmah ispod (ili iznad) njega.Ovaj broj identifikuje lokaciju u procesorskoj memoriji (RAM), gde se čuva vrednost (podatak) sa tog kontakta ili izlaza.

PLC programiranje i funkcionisanje - Ladder DiagramUpravljanje pneumatskim cilindrom

Slika na prethodnom slajdu prikazuje ulazne, procesorsku i izlazne jedinice PLC-a korištene za upravljanje pneumatskim cilindrom.

Kvadrati (1,2, 3 i 4) u ulaznom modulu IM:1 sadrže konvertore koji konvertuju prekidačke ulaze u logičke naponske nivoe.

Četiri linije povezuju ulazne “kvadratiće” sa memorijskim ćelijama (lokacijama) koje čuvaju informacije o statusu odgovoarajućih ulaza.

Gornja desna ćelija ulaznog dela memorije je povezana sa ulazom 1, ulaznog modula IM-1, tak oda nosi oznaku IM: 1-1.

Krećući se nalevo kroz memorijske ćelije njihove oznake su IM:1-2, IM:1-3, IM:1-4. Vrednost 0 u memorijskoj ćeliji IM:1-1 znači da je taster START povezan sa ulazom 1 otvoren, što i jeste.

Jedinica u memorijskim ćelijama IM:1-2 and IM:1-3 označava da su prekidači STOP i LS1zatvoreni, što i jeste.

Nula u ćeliji IM:1-4 pokazuje da je SW1 otvoren.

ZAPAMTITE! Ulazni podaci na lokacijama IM:1-2 i IM:1-3 daju informaciju da su kontakti priključeni na odgovarajuće ulaze zatvoreni. Nemamo informaciju da li su to neaktivirani NC ili aktivirani NO kontakti.



Kvadratići(1, 2, 3 i 4) izlaznog modula OM:1 sadrže prekidačka kola koji koriste logičke naponske nivoe (vrednosti izlaznih memorijskih ćelija) kako bi aktivirali ili deaktivirali izlazne uređaje (stanja ON ili OFF).

Linija povezuje izlazni kvadratić 1 sa gornjom desnom izlaznom memorijskom ćelijom, tako da je njena adresa OM:1-1.

Krećući se nalevo od ćelije OM:1-1 su ćelije OM:1-2, OM:1-3, and OM:1-4.

Nule u memorijskim ćelijama OM:1-1 i OM:1-2 znači da su solneoid i sijalica isključeni (stanje OFF).


Ladder diagram PLC program - Ladder diagram language

Upoređujući PLC program sa lestvičastim dijagramom (kontaktorskom šemom KŠ) mogu se uočiti sličnosti, ali i neke razlike.

KŠ ima tri linije (prečage, lestvice) a program samo dve. Druga linija se izgubila pošto je Sol a, izlazni uređaj povezan na izlazni terminal OM:1-1. Iz tog razloga se on ne pojavljuje u programu. Izlaz OM:1-1 na prvoj liniji programa kontroliše relej CR1, koji aktivira Sol a. Prva linija programa sadrži prve dve linije kontaktorske šeme.

PLC programiranje i principi funkcionisanja - Ladder Diagram

LD programski jezik postavlja određena ograničenja po pitanju pisanja programa, i ta

ograničenja variraju od proizvođača do proizvođača uređaja. Tipična ograničenja su:

1. Izlaz mora biti na desnom kraju grane.

2. Tok energije mora biti s leva na desno, nagore ili nadole.

3. Energija NE SME da teče s desna na levo.

4. Broj kontakata povezanih na red je maksimalno 11 (ili neki drugi broj postavljen od

strane proizvođača).

5. Broj paralelnih kontakata je maksimalno 7 (ili neki drugi broj postavljen od strane

proizvođača).

6. Grana može da ima samo jedan izlaz.

7. Izlaz mora da bude postavljen u najgronjoj liniji grane.

PLC programming and operation - Ladder Diagram Programming

• U relejnoj logici, tok energije s desna na levo se naziva “puzajući put”. Puzajući putevi nisu dozvoljeni u PLC programiranju, što pojednostavljuje samo progrmiranje ali i zahteva prilagođenje relejne logike (dijagrama). Puzajući putevi se moraju konvertovati u odgovarajuće ladder dijagrame (kontaktorske šeme) koji ih ne sadrže.

• U LD programskom jeziku otvoreni i zatvoreni kontakti su u stvari programske instrukcije, a ne preslikani kontakti kontaktorskih šema. Oni govore PLCu kako da interpretira 1 i 0 koji se nalaze na ulaznim memorijskim lokacijama (za svaki pojedinačni kontakt). Simbol normalno otvorenog kontakta (┤├) daje PlCu instrukciju da interpretira 1 kao TAČNO (TRUE) a 0 kao NETAČNO (FALSE). Ako PLC uspe da pronađe TAČAN put od ulaza do izlaza, tada je izlaz ON, u odgovarajuću izlaznu memorijsku ćeliju se upisuje 1 i aktivira se odgovarajući izlazni uređaj. Ako nije pronađen tačan put, tada je izlaz OFF, i upisuje se 0 u odgovarajuću izlaznu memorijsku lokaciju.

• Simbol NO kontakta se može koristiti i za NO i za NC fizičke kontakte. Naravno, mi kreiramo rezultate u skladu sa potrebama.


When a PLC is in the RUN mode, the processor repeats the following four-step cycle:

1. Input scan. Store a new image of input conditions.

2. Program scan. Derive the new image of output conditions.

3. Output scan. Transfer the new image of output conditions to output devices.

4. Housekeeping tasks. Communication and other tasks.

PLC programming and operation - Ladder Diagram ProgrammingControl circuit for a pneumatic cylinder

Cycle 1. start and SW1 are open, stop and LS1 are closed.

Input scan. New input image is IM:1-1 = 0, IM:1-2 = 1, IM:1-3 = 1, IM:1-4 = 0.

Program scan. Rung 1: IM:1-1 = FALSE, OM:1-1 = FALSE, IM:1-2 = TRUE, IM:1-3 = TRUE, path is FALSE, so 0 is stored in cell OM:1-1. Rung 2: IM:1-4 = FALSE so 0 is stored in cell OM:1-2.

Output scan. Both solenoid a and the light are off.


Cycle 2. START, SW1, STOP, and LS1 are all closed.

Input scan. New input image: IM:1-1 = 1, IM:1-2 = 1, IM:1-3 = 1, IM:1-4 = 1.

Program scan. Rung 1: IM:1-1 = TRUE, OM:1-1 = FALSE, IM:1-2 = TRUE, IM:1-3 = TRUE, path is TRUE, so 1 is stored in cell OM:1-1. Rung 2: IM:1-4 = TRUE, so 1 is stored in cell OM:1-2.

Output scan. Both solenoid a and the light are ON.


Cycle 3. START is open, SW1, STOP and LS1 are all closed.


Program scan. Rung 1: IM:1-1 = FALSE, OM:1-1 = TRUE, IM:1-2 = TRUE, IM:1-3 = TRUE, path is TRUE, so 1 is stored in cell OM:1-1. Rung 2: IM:1-4 = TRUE so 1 is stored in cell OM:1-2.

Output scan. Both solenoid a and the light are ON.


Cycle 4. START and LSI are open, STOP and SW1 are closed.


Program scan. Rung 1: IM:1-1 = FALSE, OM:1-1 = TRUE, IM:1-2 = TRUE, IM:1-3= FALSE, path is FALSE, so 0 is stored in cell OM:1-1. Rung 2: IM:1-4 = TRUE so 1 is stored in cell OM:1-2.

Output scan. Solenoid a is OFF, the light is ON.

PLC programming functions – Timer function

• The Timer is the most frequently used PLC function, and Time Delay On is the most

common timing function.

• Both Time Delay On and Time Delay Off are used in PLCs.

• Two types of timers are used in programmable logic controllers:

1. one-input nonretentive timer

2. two-input retentive timer.

• The nonretentive timer has one input, one output, and a preset delay time.

• The retentive timer has two inputs, one output, and two status bits that can be used as

internal outputs. The inputs are the Enable/Reset line and the Run line. The output is the

Done.

PLC programming functions – Timer function

A generic, two-input, retentive timer and a typical timing diagram. The timer is shown with the output address T:12. In the timing diagram, Enable/Reset, and Run are inputs, T:12, T:12-E, and T:12-R are outputs. Observe that the timing diagrams of T:12-E and Enable/Reset match exactly, but the diagrams of T:12-R and Run do not. Output T:12-R is ON only when Enable/Reset is ON, Run input is ON, and Done is OFF. Output T:12 (Done) is ON only after the preset time delay has been reached, and it goes OFF when Enable/Reset goes OFF.

Traditional Timer Functions

S5T#35s

S_PEXT

TV

Q

BI

R

I 0.7

I 0.5

MW0

QW12

T44

BCD

=M8.5

S

T44S_OFFDT

TV

Q

BI

R

I 0.7

I 0.5

S5T#35s

MW0

QW12BCD

=M8.5

S

T44S_ODTS

TV

Q

BI

R

I 0.7

I 0.5

S5T#35s

MW0

QW12BCD

=M8.5

S

T44S_PULSE

TV

Q

BI

R

I 0.7

I 0.5

S5T#35s

MW0

QW12BCD

=M8.5

S

Pulse Timer (SP) Extended Pulse (SE)

Stored ON Delay (SS)

T44S_ODT

TV

Q

BI

R

I 0.7

I 0.5

S5T#35s

MW0

QW12BCD

=M8.5

S

ON Delay (SD)

OFF Delay (SF)

Example

A I 0.7L S5T#35sSD T4A I 0.5R T4L T4T MW0LC T4T QW12A T4= Q8.5

STL

Example of Timer Function: ON Delay (SD)LAD

T4S_ODT

TV

S Q

BCD

BI

R

I 0.7

I 0.5S5T#35s

Q8.5

MW0

QW12

FBD

S_EVERZ

TV

Q

BI

R

I 0.7

I 0.5

S5T#35s

MW0

QW12

T4

BCD

=Q8.5

S

RLO at S

RLO at R

Time operation

Q

Units of time: 0 to 999 (BCD-coded)

0.01s <--0.1s <--

1s <--10s <--

0 00 11 01 1

Data type “S5TIME”

PLC programming functions – Counter function

• The PLC counter keeps track of the number of times a contact opens and ignores the

times the contact closes between each pair of openings.

• In this way, the counter is "counting" the event that causes the contact to open.

• The event might be an item that is conveyed past a photo detector. It might be a vehicle

that is driven over a pneumatic pressure detector. It might be a metal object on a shaft

that rotates past a magnetic detector. Industry has many events to count.

• Some PLC counters count from 0 up to a preset value; others count from the preset value

down to 0. Most PLCs include both up and down counters.

PLC programming functions – Counter functionA generic, two-input counter. The counter is shown with the output address C:7, the preset value 120, and the counter register address RA:0027. When the Enable/Reset line is OFF, the counter ignores changes on the count input line, output (C:7) is OFF, and the count register (RA:0027) is reset to 0. When the Enable/Reset line is ON, the counter increments the count by 1 each time the count input line goes from OFF to ON. The counter output (C:7) is OFF until the count in RA:0027 reaches the preset value (120). At that time, C:7 is turned ON and remains ON until Enable/Reset is turned OFF. The counter continues to increment the count register beyond the preset value, even though the output is ON, indicating it is done.

Traditional Counter FunctionsSTL

A I 0.4CU C5A I 0.5CD C5A I 0.3L C#5S C5A I 0.7R C5L C5T MW4LC C5T QW12A C5= Q8.3

LAD

QI 0.4

I 0.5

CU

I 0.7

C#5

S_CUD

CD

SI 0.3

PV

R

Q 8.3

CV

CV_BCD

MW 4

QW 12

C5

Q

FBD

I 0.4

I 0.5

I 0.7

C#5

I 0.3

Q

CU

S_CUD

CD

S

PV

R

Q 8.3

CV

CV_BCD

MW 4

QW 12

C5

=Q

Counters: Function Diagram

CU

CD

S

R

Q

Count

5

4

3

2

1

0

PLC programming functions – Counter function

Exercise: explain the LD for atwo-counter PLC program maintains a count of the number of customers in a store.

PLC programming functions – Sequencer Function• The sequencer function goes through a sequence of steps, producing specified conditions

in a number of ON/OFF outputs at each step.

• The specified output pattern for each step is stored in one word of memory, and patterns

for successive steps are stored in successive memory cells.

• Each bit in the word is matched with one output (bit 0 is matched with output No.1, bit 1 is

matched with output No.2, . . . , bit 7 is matched with output No.8).

• If a bit holds a logical 1, the sequencer turns the matching output ON (or leaves it ON).

• If a bit holds a logical 0, the sequencer turns the matching output OFF (or leaves it OFF).

• The number of outputs that a sequencer can control depends on the word size of the

PLC. An 8-bit PLC can control up to 8 outputs, and a 16-bit PLC can control up to 16

outputs.

• Additional sequencer functions can be used to control additional outputs. For example,

two 16-bit sequencers can control up to 32 outputs.

PLC programming functions – Sequencer Function• A generic sequencer with timed

steps.

• The timer is enabled by it’s own

output, causing it to reset

immediately after it has finished

a 30-s delay.

• After it has reset, the timer

immediately begins another 30-

s delay (assuming OM:1-1 is

ON).

• The timing diagram illustrates

the sequence of pulses

produced by the timer in this

circuit.

PLC programming functions – PID Control Function

In some PLCs, the PID control function is built into an I/O module.

In other PLCs, the PID function is programmed as a rung in the ladder diagram program.

Enable: Enables the function when ONManual/Auto: OFF for manual, ON for automatic controlSetpoint: Register that holds the process variableError: Register that holds the errorOutput: Register that holds the outputP: Register that holds the proportional gain settingI: Register that holds the integral action time constantD: Register that holds the derivative time setting

A generic PID controller function

DISCRETE I/O FUNCTIONS AND DEVICES - BINARY OPERATIONS

I 0.0 I 0.1 Q 8.0

Q 8.1 I 1.0

I 1.1 P =

& M1.0 M8.0

T4

S_ODT

TV

S Q

BCD

BI

R

I 0.7

I 0.5S5T#35s

Q8.5

MW0

QW12

Binary Logic Operations: AND, OR

I 0.2

I 0.3>=1

=Q 8.2 O I 0.2

O I 0.3= Q 8.2

I 0.0 I 0.1 Q 8.0

Q 8.1

LAD

=Q 8.0&I 0.0

I 0.1

=Q 8.1

FBD

A I 0.0A I 0.1= Q 8.0= Q 8.1

STL

I 0.2

I 0.3

Q 8.2

L3 (Q 8.2)

S3(I 0.2)

S4(I 0.3)OR

AND

L1(Q 8.0)

S1 (I 0.0)

S2 (I 0.1)

L2 (Q 8.1)

Circuit Diagram

Binary Logic Operations: Exclusive OR (XOR)

I 0.4

I 0.5XOR

=Q 8.0

I 0.4 I 0.5

I 0.4 I 0.5

Q 8.0

LAD

>=1=

Q 8.0&I 0.4

I 0.5

&I 0.4

I 0.5

FBD

A I 0.4AN I 0.5OAN I 0.4A I 0.5= Q8.0

STL

X I 0.4X I 0.5= Q8.0

Assignment, Setting, Resetting

(S)Q 8.1I 1.2 I 1.3

I 1.2 &

SQ 8.1

I 1.3

I 1.4 >=1

RQ 8.1

I 1.5

A I 1.2A I 1.3S Q 8.1

O I 1.4O I 1.5R Q 8.1

I 1.0 &

=Q 8.0

I 1.1

A I 1.0A I 1.1= Q 8.0Assignment

Set

Reset(R)

Q 8.1I 1.4

I 1.5

( )Q 8.0I 1.0 I 1.1

LAD FBD STL

RLO – Edge Detection

A I 1.0A I 1.1FP M1.0= M8.0

A I 1.0A I 1.1FN M1.1= M8.1

PI 1.0 I 1.1 M1.0 M8.0

NI 1.0 I 1.1 M1.1 M8.1

I 1.0

I 1.1 P =

& M1.0 M8.0

I 1.0

I 1.1 N =

& M1.1 M8.1

I 1.0

I 1.1

RLO

M1.0

M8.0M8.1

M1.1

LAD FBD STL

OB1 Cycle

Example

Digital Operations

I 0.0 I 0.1 Q 8.0

Q 8.1 I 1.0

I 1.1 P =

& M1.0 M8.0

T4

S_ODT

TV

S Q

BCD

BI

R

I 0.7

I 0.5S5T#35s

Q8.5

MW0

QW12

DEC: + 662 BIN.: 2# 0 0 0 0 1 0 1 0 0 1 0 1 1 0000123456789101112131415

DEC: - 662

Integer (INT, 16-Bit Integer) Data Type

Value range -32768 to +32767(without sign: 0 to 65535)

Display Formats:

+21+22

+24 6 x 160 = 69 x 161 = 144

2 x 162 = 512662

+27+29

+25+26+28

Arithmeticoperations: such as + I, * I, <I, ==I

+210+211

+212+213

+214-215

- 662

Signpositivenumbers

Signnegativenumbers

Representation as Twos complement

+23 +21

+ 662

10 x 160 =166 x 161 = 96

13 x 162 = 3328

6487415 x 163 = 61440

BIN.: 2# 1 1 1 1 0 1 0 1 1 0 1 0 1 0110123456789101112131415

HEX: W#16 9 62#0

HEX: W#16# 6 ADFwithoutsign

withoutsign

DEC: L# +540809

Double Integer (DINT, 32-Bit Integer) Data Type

Value range L# -2147483648 to L#+2147483647(without sign: 0 to 4294967295)

Display Formats:

Operations: such as + D, * D, <D, ==D

(without sign)

0 0 0 8 4 0 8 9HEX: DW#16#

0 0 0 0 0 0 1 0 0 0 1 0 0 1100001000000000000BIN.: 2#012345678910111213141516171819202122232425262728293031

Representation as Twos complement

(without sign)

F F F 7 B F 7 7HEX: DW#16#

1 1 1 1 1 1 0 1 1 1 0 1 1 1011110111111111111BIN.: 2#012345678910111213141516171819202122232425262728293031

DEC: L# -540809

Signnegativenumbers

Signpositivenumbers

REAL (Floating-point Number, 32 Bit) Data Type

General format of a Real number = (Sign) • (1.f) • (2e-127)

Real no. = +1.5 * 2 126-127 = 0.75

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 1 1 1 1 1 1 0 1 0 0 0 0 0

Sign ofReal no.

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 031 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

e = Exponent (8 Bit) f = Mantissa (23 Bit)

2021222324252627 2-232-1 2-2 2-4 .....2-3

Operations: such as + R, * R, <R, ==Rsin, acos, ln, exp, SQR

Example: 0.75

Value range -3.402823•10+38 to -1.175495•10-38 , 0.0, +1.175495•10-38 to +3.402823•10+38

The BCD Code for Inputting and Outputting Integers

6920

Value range 16 Bit: - 999 to + 99932 Bit: -9999999 to + 9999999

Conversionoperations: BTI, BTD, ITB, DTB

(no arithmetic!)

0 0 0 0 1 0 1 0 0 1 0 1 1 000000000000000xxx0BIN.: 2#

BIN.: 2# 0 0 0 0 1 0 1 0 0 1 0 1 1 000

Sign (+) 92

16 Bit:

32 Bit:

Sign (+)

6

6920000

DEC: + 662HEX: W#16# 2 9 60

DEC: + 662HEX: DW#16# 0 0 0 0 2 9 6

Conversion Operations BCD <-> Integer

0 8 1 5NumberEntered in BCD

Number displayedin BCD

ConversionBCD->Integer

IN

BCD_IEN

ENO

OUT

INIW4

MW20

IN

I_BCDEN

ENO

OUT

INMW10

QW12

FBD

L IW4BTIT MW20

L MW10ITBT QW12

STL

Task

ConversionBCD<-Integer

User program with Integermath operations

0 2 4 8

IN

BCD_IEN ENO

OUTINIW4 MW20

I_BCD

IN

EN ENO

OUTMW10 QW12

LAD

Comparison Operations

STL

A M 3.4A (L IW 0L IW 2>=I)= Q 9.7

FBD

M 3.4IW0

IW2 =Q9.7&

CMP >=I

IN1

IN2

LAD

IW 0IW 2

M 3.4 Q 9.7CMP >=I

IN1IN2

LAD FBD STL

Basic Mathematical Functions

AdditionL MW4L MW10+ IT MW6MW10

ADD_I

IN2

EN

ENO

OUTIN1MW4

MW6

MW10

ADD_I

IN2

EN ENO

OUTIN1MW4

MW6

Subtrac-tion

MW12

SUB_I

IN2

EN

ENO

OUTIN1MW8

MW6L MW8L MW12- IT MW6

SUB_I

IN2

EN ENOIN1MW8

MW12 MW6OUT

Multipli-cation

MD12

MUL_DI

IN2

EN

ENO

OUTIN1MD6

MD66L MD6L MD12* DT MD66

MD6MD12

MUL_DIEN ENOIN1

MD66IN2

Division

MD4

DIV_R

IN2

EN

ENO

OUTIN1MD40

MD32 L MD40L MD4/ RT MD32

MD40

MD4

EN ENOIN1IN2 MD32OUT

DIV_R

Storing Process Data in Data Blocks

Storage Areas for Data

Data Blocks (DBs)

FunctionFC10

FunctionFC20

FunctionBlockFB1

OB1Global (shared)

data

DB20

Accessible to all blocks

Instance Data

DB5

Instance DB for FB1

Overview of Data Types in STEP 7

Elementarydata types(up to 32 bits)

Complexdata types(longer than 32 bits)

User-defined data types(longer than 32 bits)

• Bit data types (BOOL, BYTE, WORD, DWORD, CHAR)

• Mathematical data types (INT, DINT, REAL)

• Time types (S5TIME, TIME, DATE, TIME_OF_DAY)

• Time type (DATE_AND_TIME)

• Array (ARRAY)

• Structure (STRUCT)

• Character chain (STRING)

Data type UDT (User DefinedData-Type)

Elementary Data Types in STEP 7

Keyword Length (in bits) Examples Variables

BOOL 1 True or false I 1.0BYTE 8 B#16#A9 MB70WORD 16 W#16#12AF MW72DWORD 32 DW#16#ADAC1EF5 QD40CHAR 8 ' w ' DBB4

S5TIME 16 S5T#5s_200ms MW30

INT 16 123 #ValueDINT 32 L#65539 MD80REAL 32 1.2 or 3.45E-11 DBD60

TIME 32 T#2D_1H_3M_45S_12MS QD44DATE 16 D#1993-01-20 MW32TIME_OF_DAY 32 TOD#12:23:45.12 #Time

Complex Data Types

Keyword Length (in bits) Example

DATE_AND_TIME 64 DT#01-08-24-12:14:55:234-1

STRING 8 * (number of ´This is a string´(character string with characters +2) ´SIEMENS´max. 254 characters)

ARRAY user- Measured values: ARRAY[1..20](Group of elements defined INT of the same data type)

STRUCT user- Motor: STRUCT(Group of elements defined Speed : INTof different data types) Current : REAL

END_STRUCT

UDT UDT as block UDT as array element

(User Defined Data Type = user- STRUCT "Template" consisting of defined Speed : INT Drive: ARRAY[1..4]elementary or complex Current : REAL UDT1 data types END_STRUCT

0.0 Start BOOL0.1 Stop BOOL2.0 Motor_on BOOL4.0 Speed INT

DB 5

FB 5

in Start BOOLin Stop BOOLout Motor_On BOOLout Speed INTstat ...Temp...

...A #StartAN #Stop= #Motor_on...

Drive

Function FC10

in On_1 BOOLin On_2 BOOLout Off BOOL...

...A #On_1A #On_2= #Off...

CALL FB5, DB5Start :=I 0.0Stop :=I 0.1Motor_on :=Q8.0Speed :=QW12

Programexecution

CALL FC 10On_1 := I 0.1On_2 := I 0.2Off := Q8.0

Functions and Function Blocks (1)

Exercise X of day 7

Summary of day 7

Programabilni Logički Kontroleri PLC

Documents

Transcript of Programabilni Logički Kontroleri PLC