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易卖工控网(www.ymgk.com)提供”MGX-FRSM-HS2/B 控制模块”,产品详情:品牌/厂家:其他品牌、型号:MGX-FRSM-HS2/B、成色:全新、货期:期货 7天内发货、保修:365天,更多产品详情就上易卖工控网。
RELIANCE ELECTRIC 45C-17
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工厂底层设备状态及生产信息集成、车间底层数字通信网络是信息集成系统的基础
为满足工厂上层管理对底层设备信息的要求, 工厂车间底层设备状态及生产信息集成是实现全厂FA/CIMS的基础。见图3: 工厂自动化信息网络分层结构:工厂管理级、车间监控级、现场设备级
<工厂自动化信息网络分层结构:工厂管理级、车间监控级、现场设备级 >
(3) 现场总线技术的产生
现场总线(FieldBus)是工厂底层设备之间的通信网络,是计算机数字通信技术在自动化领域的应用,为车间底层设备信息及生产过程信息集成提供了通信技术平台.图4是工厂底层应用现场总线技术实现了全厂信息纵向集成的透明通信,即从管理层到自动化底层的数据存取.
<工厂底层应用现场总线技术实现了全厂信息纵向集成的透明通信>
(4) 现场总线国际标准之一ROFIBUS技术
ROFIBUS技术是1987年由Siemens公司等13家企业和5家研究机构联合开发;1989年批准为德国工业标准DIN 19245(PROFINUS-FMS/-DP);1996年批准为欧洲标准EN 50170 V.2 (PROFIBUS-FMS/-DP);1999年PROFIBUS成为国际标准 IEC 61158 的组成部分(Type III).
PROFIBUS技术为设备层提供了PROFIBUS-DP和-PA技术,为车间层提供了PROFIBUS-FMS技术,见图5。
PROFIBUS-DP是设备层现场总线, 用于控制器(如PLC、PC、NC)与现场控制设备(如驱动器、检测设备、HMI等)之间的通信总线;
设备层现场总线技术具有高速(12M)、实时、确定、可靠特点(如-DPV2可用于运动控制),传输的数据量相对较小。
PROFIBUS-PA也是设备层总线,具有IEC61158-2的物理层,可实现总线供电,并有本质安全技术。