ABB模拟量模块di802
电梯是一个复杂的系统。移动轿厢和机房控制器之间的主要通信链路是通过移动电缆实现。基于楼宇高度,该电缆长度可到达10到500 米或更长范围。鉴于其低速要求和所需的电缆距离,控制器局域网(CAN)和LonWorks是电梯系统常用的协议。
考虑到电缆在运行期间所承受的压力,电缆在数年内保持可靠性是非常重要的。电梯上下移动时,电缆需弯曲,这对于光纤布线而言并不合适,因此大多数电梯电缆均由铜制成。考虑到电缆长度,标准以太网不适用,因为它不能超过100米。
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