HK3-F120++HK3-F120
HK3-F120++HK3-F120S7-200PLC內(nèi)部RS485接口電路圖:
圖中R1、R2是阻值為10歐的普通電阻,其作用是防止RS485信號D+和D-短路時產(chǎn)生過電流燒壞芯片,Z1、Z2是鉗制電壓為6V,最大電流為10A的齊納二極管,24V電源和5V電源共地未經(jīng)隔離,當(dāng)D+或D-線上有共模干擾電壓灌入時,由橋式整流電路和Z1、Z2可將共模電壓鉗制在±6.7V,從而保護RS485芯片SN75176(RS485芯片的允許共模輸入電壓范圍為:-7V~+12V)。該保護電路能承受共模干擾電壓功率為60W,保護電路和芯片內(nèi)部沒有防靜電措施。 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
公司 名稱:廈門泰尼電氣有限公司
固定 電話:0592-6809819
聯(lián) 系 人:張亮
傳 真:0592-6890859【請備注“張亮”收】
商 務(wù) Q Q: 2314094943
手 機:18030028083
Q Q 郵 箱:2314094943@qq.com
需要可以聯(lián)系絕對給你滿意的價格
公司地址:廈門市海滄區(qū)海滄街道濱湖一里7號2008室
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