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Friday, August 6, 2010


Tiap-tiap PLC pada dasarnya merupakan sebuah mikrokontroler (CPU-nya PLC bisa berupa mikrokontroler maupun mikroprosesor) yang dilengkapi dengan periferal yang dapat berupa masukan digital, keluaran digital atau relay. Perangkat lunak programnya sama sekali berbeda dengan bahasa komputer seperti pascal, Basic, C dan lain-lain, programnya menggunakan apa yang dinamakan sebagai diagram tangga atau ladder diagram.

CPM1A dan CPM2A merupakan PLC produk Omron, perbedaan mendasar antara CPM1A dan CPM2A adalah fungsi dan jumlah terminal masukan dan keluarannya, CPM1A 10 memiliki 6 masukan (I0 – I5) dan 4 keluaran (O0 – O3) total jalur keluaran/masukan, sedangkan CPM2A memiliki 20 jumlah keluaran dan masukan yang jauh lebih banyak, yaitu 12 masukan dan 8 keluaran (total 20 jalur keluaran/masukan). Pada gambar II.1 dan II.2 ditunjukkan gambar Omron CPM1A 10 keluaran/masukan (10 I/O), sedangkan pada gambar II.3 ditunjukkan gambar Omron CPM2A 20 keluaran/masukan.

Sebagai mana terlihat pada gambar II.1 (CPM1A-10) maupun II.3 (CPM2A-20), selain adanya indikator keluaran dan masukan, terlihat juga adanya 4 macam lampu indikator, yaitu PWR, RUN, ERR/ALM dan COMM. Arti masing-masing lampu indikator tersebut ditunjukkan pada tabel II.1.






Catu daya disalurkan ke PLC



Catu daya tidak disalurkan ke PLC



PLC dalam kondisi mode kerja RUN atau monitor



PLC dalam kondisi mode PROGRAM atau munculnya

kesalahan yang fatal



Data sedang dikirim melalui port periferal atau RS-232C



Tidak ada proses pengiriman data melalui port periferal

maupun RS-232C



Muncul suatu kesalahan fatal (operasi PLC berhenti)



Muncul suatu kesalahan tak-fatal (operasi PLC berlanjut)


Operasi berjalan dengan normal

Gambar . Omron CPM1A

Selain 4 lampu indikator, juga bisa ditemukan adanya fasilitas untuk melakukan hubungan komunikasi dengan komputer, melalui RS-232C atau yang lebih dikenal dengan port serial


  1. gan plc omron cpm1a ntu ngak adaanalog input ataupun output ya

  2. Kalo CPM1a setau saya gak ada I/O analognya

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