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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.
Indikator
|
Status
|
Keterangan
|
PWR
|
ON
|
Catu daya disalurkan ke PLC
|
(Hijau)
|
OFF
|
Catu daya tidak disalurkan ke PLC
|
RUN
|
ON
|
PLC dalam kondisi mode kerja RUN atau monitor
|
(Hijau)
|
OFF
|
PLC dalam kondisi mode PROGRAM atau munculnya
|
kesalahan yang fatal
| ||
COMM
|
Kedip
|
Data sedang dikirim melalui port periferal atau RS-232C
|
(kuning)
|
OFF
|
Tidak ada proses pengiriman data melalui port periferal
|
maupun RS-232C
| ||
ERR/ALM
|
ON
|
Muncul suatu kesalahan fatal (operasi PLC berhenti)
|
(merah)
|
Kedip
|
Muncul suatu kesalahan tak-fatal (operasi PLC berlanjut)
|
OFF
|
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
gan plc omron cpm1a ntu ngak adaanalog input ataupun output ya
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Gan mau nanya kalo cpm1a bisa mengeluarkan output pwm tida?
BalasHapusTerus cpu di cpm1a ada berapa?
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