Pekan 7 PLC

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    JurusanTeknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    TIA314

    Otomasi Sistem Produksi

    Pekan ke-7:

    Programmable Logic Controller

    Jurusan Teknik Industri

    Universitas Andalas

    JurusanTeknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    Hasil Pembelajaran

    Umum Mahasiwa mampu untuk melakukan proses perancangan

    sistem otomasi, sistem mesin NC, serta merancang danmengimplementasikan sistem kontrol logika.

    Khusus Memahami fungsi PLC serta komponen-komponen PLC

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    JurusanTeknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    Sejarah PLC First Programmable Logic Controllers were designed and

    developed by Modicon as a relay replacer for GM andLandis.

    These controllers eliminated the need for rewiring andadding additional hardware for each new configuration oflogic.

    The new system drastically increased the functionality ofthe controls while reducing the cabinet space that housedthe logic.

    The first PLC, model 084, was invented by Dick Morley in1969.

    The first commercial successful PLC, the 184, wasintroduced in 1973 which was designed by MichaelGreenberg.

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    JurusanTeknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    Definisi

    Definition: small computers, dedicated to automation tasks in an

    industrial environment"

    Formerly: cabled relay control (hence 'logic'), analog (pneumatic,

    hydraulic) governors

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    Definisi National Electrical Manufacturing

    Association (NEMA)

    "A digitally operating electronic apparatus which uses aprogrammable memory for the internal storage ofinstructions by implementing specific functions such aslogic sequencing, timing, counting, and arithmetic tocontrol, through digital or analog input/output modules,various types of machines or processes

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    Jurusan Teknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    PLC Sederhana

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    Contoh: turbine control (in the test lab)

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    PLC: Location in the control architecture

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    Jenis PLC1. Compact

    Monolithic construction

    Monoprocessor

    Fieldbus connection

    Fixed casing

    Fixed number of I/O (most of them binary)

    No process computer capabilities (no MMC)

    Typical product: Mitsubishi MELSEC F, ABB AC31, SIMATIC S7

    2. Modular PLC Modular construction (backplane) One- or multiprocessor system Fieldbus and LAN connection

    3U or 6U rack, sometimes DIN-rail Large variety of input/output boards

    Connection to serial bus

    Small MMC function possible

    Typical products: SIMATIC S5-115, Hitachi H-Serie, ABB AC110

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    JurusanTeknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    Jenis PLC

    3. Soft-PLC Windows NT or CE-based automation products Direct use of CPU or co-processors

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    Jurusan Teknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    Jenis PLC

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    Jurusan Teknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    Jenis PLC

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    Jurusan Teknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    Jenis PLC

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    Fungsi Pengendali

    1. On-off control,

    2. Sequential control,

    3. Feedback control, and

    4. Motion control.

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    Jurusan Teknik Industri, UniversitasAndalas

    TIA314 Otomasi Sistem Produksi, Pekan #6

    Konfigurasi PLC

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    What devices does a PLC interact with?

    INPUT RELAYS-(contacts)These are connected to the outside world. Theyphysically exist and receive signals from switches, sensors, etc. Typicallythey are not relays but rather they are transistors.

    INTERNAL UTILITY RELAYS-(contacts) These do not receive signals fromthe outside world nor do they physically exist. They are simulated relaysand are what enables a PLC to eliminate external relays. There are alsosome special relays that are dedicated to performing only one task. Some

    are always on while some are always off. Some are on only once duringpower-on and are typically used for initializing data that was stored.

    COUNTERS-These again do not physically exist. They are simulatedcounters and they can be programmed to count pulses. Typically thesecounters can count up, down or both up and down. Since they aresimulated they are limited in their counting speed. Some manufacturersalso include high speed counters that are hardware based. We can think ofthese as physically existing. Most times these counters can count up,down or up and down.

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    What devices does a PLC interact with? TIMERS-These also do not physically exist. They come in many

    varieties and increments. The most common type is an on-delaytype. Others include off-delay and both retentive and nonretentive types. Increments vary from 1ms through 1s.

    OUTPUT RELAYS-(coils)These are connected to the outside world.They physically exist and send on/off signals to solenoids, lights,etc. They can be transistors, relays, or triacs depending upon themodel chosen.

    DATA STORAGE-Typically there are registers assigned to simplystore data. They are usually used as temporary storage for mathor data manipulation. They can also typically be used to store

    data when power is removed from the PLC. Upon power-up theywill still have the same contents as before power was removed.Very convenient and necessary!!

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    COUNTER

    Digital counters output in the form of a relaycontact when a preassigned count value isreached.

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    TIMER A timer consists of an internal clock, a count

    value register, and an accumulator. It is used foror some timing purpose.

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    PLC COMPONENTS

    1. ProcessorMicroprocessor based, may allow arithmetic operations, logic operators,block memory moves, computer interface, local area network, functions,etc.

    2. Memory Measured in words. ROM (Read Only Memory),

    RAM (Random Access Memory), PROM (Programmable Read Only Memory),

    EEPROM (Electronically Erasable Programmable ROM),

    EPROM (Erasable Programmable Read Only Memory),

    EAPROM (Electronically Alterable Programmable Read Only Memory),and

    Bubble Memory.

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    PLC COMPONENTS3.I/O

    Modular plug-in periphery AC voltage input and output, DCvoltage input and output, Low level analog input, High levelanalog input and output, Special purpose modules, e.g.., highspeed timers, Stepping motor controllers, etc. PID, Motion

    4.Power supply AC power5.Peripheral

    Hand held programmer (loader), CRT programmer, Operatorconsole, Printer, Simulator, EPROM loader, Cassette loader,Graphics processor, and Network communication interface. MAP,LAN

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    TIA314 Otomasi Sistem Produksi, Pekan #6

    Programming the PLC

    Types of Programming Software Languages Ladder Logic (LL)

    IEC Format

    Function Block Diagram (FBD)

    Structured Text (ST)

    Instruction List (IL) Ladder Diagram (LD)

    Sequential Function Chart (SFC) - also known as Grafcet

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