Yap, sesuai judulnya kali ini kami akan membahas sedikit mengenai modul yang dapat menghasilnya arus di rentang 0-20mA yang dapat dikontrol melalui komunikasi via modbus. Modul yang digunakan modelnya seperti gambar di bawah ini ya
Modul ini hanya memiliki 1 channel output arus ya.. dengan tegangan kerja yang lumayan lebar yaitu 12V ~ 25V dc. Jadi buat kalian yang hanya punya adaptor 12V atau punya 24V bisa digunakan untuk mensupply modul ini. Langsung aja ke spesifikasinya.
1. tegangan input/ supply : 12 ~ 25VDC
2. komunikasi : Modbus RTU (support command function 03 06)
3. range output arus : 0.5 ~ 21mA
4. akurasi output : +- 1%
5. Modbus command : serial HyperTerminal (serial assistant) atau PLC Enter
6. jumlah maksimum sambungan : 247 modul
Salah satu kelebihan modul ini adalah jumlah modul yang bisa digunakan dalam satu sistem mencapai 247 secara paralel dengan cara mengakses alamat modul masing-masing dan yang lebih memudahkan adalah, dalam penggunaan modul ini tidak diperlukan lagi microprosesor (jika dihubungkan dengan komputer), cukup gunakan RS485 to USB adapter dan modul ini sudah dapat digunakan menggunakan software serial komunikasi secara umum (modbus protokol)
Wiring/Skema
Modbus Protokol
Modul ini mendukung 2 instruksi komunikasi via modbus protokol yaitu perintah/fungsi 03(read) dan fungsi 06(write).
Parameter komunikasi
Untuk parameter komunikasinya sendiri, sudah disediakan datasheet/manualnya oleh manufakturnya seperti di bawah ini
Pengetesan
Untuk pengetesan kami menggunakan aplikasi modbus poll yang sudah tersedia. Bisa download DISINI
Untuk lebih jelasnya bisa cek di video ini ya
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The accuracy spec of plus minus 1 percent is worth checking before trusting the output, since that error compounds when you scale it into a control loop. One practical step: after wiring the RS485 adapter, send function 03 to read back the register you just wrote with function 06, and compare the raw value against a multimeter on the output terminals. Do this at 4mA, 12mA and 20mA. If the deviation exceeds your process tolerance, apply a two point calibration offset in your PLC scaling.
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