Pengenalan PLC JenisJenis PLC Hasil Pembelajaran LO Di

Pengenalan PLC Jenis-Jenis PLC

Hasil Pembelajaran (LO) Di akhir pembelajaran ini, para pelajar dapat menerangkan jenis – jenis PLC yang terdapat di pasaran

Jenis – Jenis PLC Terdapat 3 jenis PLC yang terdapat di pasaran, iaitu : 1. 2. 3. Unitary / Compact Modular Rack

Unitary /Compact PLCs Typically the smallest and least expensive. It would be used in a small machine or fixed application such as overhead door controls or a stand-alone parts inspection system. They are not expandable so the application is limited to on-board I/O.

Unitary /Compact PLCs (Cont. . ) Some very powerful units available with built in GSM, color screens, and web servers. Most have 1 or 2 analog I/O channels as well as a high speed input and pulse train output for simple motion control.

Unitary /Compact PLCs

Modular PLCs Typically mount to a DIN rail and sometimes require a separate power supply. Additional I/O as well as specialty modules also snap onto the DIN rail and plug into the processor or adjacent module.

Modular PLCs (Cont. ) Modular PLCs are used in applications where a higher I/O count is needed or when using specialty modules such as quadrature encoders, thermocouple inputs, etc. They are also useful in small applications that have options or “upgrades” available to the end user. Systems can be expanded (within certain limits) without adding additional rack space.

Modular PLCs

Rack PLCs More expensive, expandable, and powerful than unitary or modular PLCs. The rack provides a power and communication backplane that greatly increases the communication rate between the processor and the modules as well as allowing some specialty modules to communicate with each other without the processor.

In some brands, multiple processors can be in the same rack and share the inputs. Racks also allow for redundant processors for critical systems such as waste water pumps or fire control systems. The types of modules available for rack systems are far more extensive than modular systems. The number of available I/O points is also much higher in the rack systems. Around 1000 for some modular PLCs versus over 100, 000 for the same brand of rack system.

Rack PLCs

Perbandingan Jenis PLC Perbandingan Saiz Harga Aplikasi Input Output (I/O) Unitary Modular Rack Kecil Besar Sangat besar Murah Mahal Sangat mahal Mesin yang kecil & aplikasi tetap Mesin & aplikasi besar Aplikasi besar dan melibatkan berbilang pemproses I/O terhad Sistem mampu dinaiktaraf Bilangan I/O yang banyak, boleh ditambah Mempunyai modul komunikasi Bilangan I/O yang sangat banyak Special module