¥ 价格面议
¥ 价格面议
¥ 价格面议
¥ 价格面议
易卖工控网(www.ymgk.com)提供”YPQ110 特价销售”,产品详情:品牌/厂家:其他品牌、型号:YPQ110、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。
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4. 以太网能否取代现场总线技术成为统一的工业网络标准
(1) 预测未来是最艰难的事;现场总线是专为工业现场层设备通信设计,是为自动化量体裁衣的技术。以太网设计初衷是办公网,用于数据处理。从技术比较出发似乎很容易得出结论。但技术发展受社会政治、经济影响,市场因素很大程度左右技术走向,回顾计算机发展历史,这种先例不胜枚举。因此,以太网在工厂自动化车间监控层及管理层将成为主要应用技术,特别是采用TCP/IP协议可与互连网Internet连接, 是未来eManufactory的技术基础。在设备层,在没有严格的时间要求条件下,以太网也可以有部分市场。在以太网能够真正解决实时性和确定性问题之前,大部分现场层仍然会首选现场总线技术。
(2) 一体化与多元化并存
面对这样一个多种工业总线技术并存的现状,我们应该有一个豁达的心态。哲学家告诉我们,一体化与多元化是一对互为依存的矛盾,将长时间共存与竞争;以太网反映了人们要求技术标准化、一体化的愿望,而现实是不能用一种技术覆盖各行业所有不同需求。IEC61158的发展历程就给了我们一个深刻的启示,我们必须学会面对一个多种工业总线技术竞争和共存的现实世界。