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نمونه رفتار عجیب در سیستم S7-400H زیمنس

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mohamad reza maher

(@mohandesmaher)

عضو Admin

عضو شده: 7 سال قبل

ارسال‌ها: 92

۲۷/۱۲/۱۳۹۷ ۵:۵۵ ب.ظ

رفتار عجیب S7-400H زیمنس

در سیستم های وقتی هر دو CPU با پروفیباس به ماژول های IM153-2 متصل هستند اگر کابل پروفیباس سمت Master قطع شود ماژول های IM جابجا می شوند ولی CPU ها جابجانمیشوند و اطلاعات پروفیباس به Standby داده شده سپس با فیبر نوری به Master ارسال میشود . تا اینجا که مشکلی نیست.

اگر در این وضعیت یک ارتباط فیبر نوری قطع شود وضعیت در انواع H یکسان نیست . رفتار عجیب در CPU412-5H دیده شده است . در این شرایط CPU412-5H اگر فاقد OB8x باشد سوئیچ می کند و آنکه قبلا Standby بوده اکنون Master می شود و کنترل فرآیند بدون مشکل ادامه می یابد . ولی اگر OB8x دانلود شده باشد رفتار خطرناکی بروز می کند و هر دو CPU دچار مشکل میشوند و کنترل از دست می رود. بنابراین بنظر میرسید در این شرایط وجود OB8x مزاحم کار نرمال CPU است !!

با بررسی های انجام شده مشخص شد که اگر OB8x همراه با OB7x دانلود شده باشد این مشکل رخ نمی دهد و جابجایی نرمال انجام می شود . بنابراین نقش OB7x صرفا برای تولید آلارم نیست و در این شرایط نقش کلیدی در کار کنترل دارد.

با سپاس از آقای مهندس منوچهر مومنی که این موضوع را بررسی کردند.

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ُS7-400H

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(@en-sh66fazli)

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عضو شده: 7 سال قبل

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۲۱/۰۱/۱۳۹۸ ۹:۰۹ ب.ظ

اقای مهندس این مشکل تنها در412-5Hرخ میده؟

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