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PROFIBUS-FMS车间级现场总线,主要用于车间级设备监控。主要完成车间生产设备状态及生产过程监控、车间级生产管理、车间底层设备及生产信息集成。车间级现场总线具有传输数据量大、应用层信息规范完整等特点,对网络实时性要求不高。
(5)国际现场总线技术标准IEC61158
根据现场总线技术概念,面对自动化行业千变万化的现场仪表设备,要实现不同厂家不同种类产品的互连,现场总线技术标准化工作至关重要。为此, 国际IEC委员会于1984年提出制定现场总线技术标准IEC1158(即IEC61158)。
A. IEC 61158目标:IEC1158的目标是制定面向整个工业自动化的现场总线标准。为此,根据不同行业对自动化技术的需求不同,将自动化技术分为五个不同的行业;见图6:IEC1158的目标。IEC61158是要制定出一部满足工业自动化五大行业不同应用需求的现场总线技术标准。
B.妥协的结果
经过十几年的努力,1998年,对IEC 61158 (TS)进行投票。由于IEC 61158 (TS)只包含了Process Control部分,因此,IEC 61158 (TS)没有通过投票,自动化行业期待了十多年的统一的现场总线技术标准的努力失败。1999年12月,IEC61158放弃了原有设想,通过妥协方案,即: 以IEC 61158 (TS)+ Add.Protocols作为IEC61158技术标准的方案;其中Add.Protocols包含Control Net、PROFIBUS、P-Net、FF HSE、Swift Net、WorldFIP和Interbus总线。
自动化行业将面临一个多种总线技术标准并存的现实世界。
C.IEC 61158发展历程给我们的启示
面对当今以太网在自动化领域的应用潮流,IEC 61158发展历程至少给了我们两点启示,这对我们能够清醒面对现实颇有好处:I、工业自动化技术应用于各行各业,使用一种现场总线技术不可能满足所有行业的技术要求;现场总线不同于计算机网络,人们将会面对一个多种总线技术标准共存的现实世界。II、技术发展很大程度上受到市场规律、商业利益的制约;技术标准不单是一个技术规范,也是一个商业利益的妥协产物。