Dikonfigurasi untuk pemerolehan isyarat diskret dalam seni bina SLC 500, Allen‑Bradley 1746‑IB8 (modul input digital 1746‑IB8) menyediakan pelaksanaan elektrik langsung pengesanan input 24 VDC sinking, antara muka logik berkuasa backplane, dan peralihan keadaan dengan kelewatan tetap.
Spesifikasi Perkakasan
Parameter
Spesifikasi
Model
1746‑IB8
Jenama
Allen‑Bradley
Asal
Tidak dinyatakan
Berat
Tidak dinyatakan
Dimensi
Tidak dinyatakan
Temperatur Operasi
Tidak dinyatakan
Penggunaan Kuasa
5 VDC pada 0.050 A (backplane), 24 VDC pada 0.0 A
Kategori Voltan
Input sinking 24 VDC
Bilangan Input
8
Titik per Umum
8
Voltan Operasi
10…30 VDC
Kelewatan Isyarat (maksimum)
ON = 8 ms, OFF = 8 ms
Voltan Keadaan Mati (maksimum)
5.0 VDC
Arus Keadaan Mati (maksimum)
1 mA
Arus Input (nominal)
8 mA @ 24 VDC
Kelajuan Komunikasi Bas Backplane dan Keserasian Firmware
Dalam platform SLC 500, 1746‑IB8 menyertai komunikasi bas backplane yang deterministik, memastikan masa imbas input yang boleh diramal berbanding kitaran imbas pemproses. Beban modul 50 mA pada 5 VDC menyumbang kepada peningkatan ketumpatan I/O keseluruhan, memerlukan peruntukan bajet kuasa yang betul apabila beberapa modul digunakan serentak. 1746‑IB8 tidak mengandungi firmware yang boleh dikemas kini oleh pengguna; keserasian ditentukan semata-mata oleh revisi pemproses SLC yang dipasang.
Soalan Lazim
S: Bolehkah 1746‑IB8 ditukar panas dalam chasis SLC yang berkuasa? J: Tidak. Modul hanya harus dimasukkan atau dikeluarkan apabila chasis dimatikan kuasa untuk mengelakkan kesilapan komunikasi backplane.
S: Adakah modul menyokong input sumber? J: Tidak. 1746‑IB8 direka khas untuk konfigurasi input sinking sahaja.
S: Bagaimana kelewatan isyarat mempengaruhi pengenalan input? J: Kelewatan ON/OFF tetap 8 ms menentukan masa peralihan minimum yang diperlukan untuk pengesanan yang boleh dipercayai.
Garis Panduan Pemasangan Lapangan
Susun pendawaian input 24 VDC berasingan daripada konduktor voltan tinggi untuk mengurangkan gangguan bunyi. Kekalkan penglibatan terminal yang betul dan patuhi saiz konduktor yang disyorkan. Pastikan peranti input sinking dipasang dengan polariti yang betul untuk mengelakkan keadaan palsu. Sahkan kapasiti kuasa backplane apabila memasang beberapa modul digital. Kekalkan keadaan kelembapan tanpa kondensasi untuk mengelakkan pengoksidaan terminal.
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