1747-L532
1747-L532
1747-L532
1747-L532
_________________________________________ 〖厦门光沃自动化设备有限公司 竭诚为您服务〗 〖联系人：欧工 〗 〖手机：18030229053(微信同号) 〗 〖QQ: 2479261344 〗 〖传真：0592-5709825 【价格】如此低价,仅此一家 【货期】大量现货,下单后即可发货 【质量】全新原装,进口*** 【保障】产品经过专业检测，质保一年,15天包退换 【品牌】Allen-Bradley罗克韦尔、ABB、本特利Bently 3500系统卡件、GE、艾默生西屋等模块卡件 ______________________________________________
(1)模数转换部分，实现模拟信号的数据采集。 (2)下位机的串口软件。由实际仪表的通讯协议定义的下位机通讯软件，重点是要看实际仪表的通讯方式。 (3) MODBUS通讯软件。重点是要分清每个通讯的数据帧的帧头和帧尾，特别是在RTU模式下，必须分清帧头在什么位置。做法是在串口中断中打开定时中断，在通讯间隔超过通讯3.5个字符时认为通讯一帧结束，再来串口中断就是下一帧的开始。 (4)数据处理软件。MODBUS通讯协议建立在CRC校验基础之上，因此通讯可靠性比较好，在软件中采用查表的方式来进行MODBUS校验，极大地提高了程序运行的效率。 4 结束语 该通讯模块是针对工业上来自不同厂商生产的检测仪表进行组网数据采集的。可以对现场工业仪表输出的标准的模拟信号和RS-232数字信号进行软件处理，并以MODBUS通讯协议的形式上传到上位机控制系统，实现进一步的存储和控制等处理。在投人运行中，模块本身实现了实时性、可靠性、组网简单化等特点。随着工控组态软件的广泛采用，提高了系统的成功率和可靠性。带有标准协议的通用型数据采集模块有广泛应用。 Snap-Lock EA080-22100 Limit Switch
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