在共建实验室完成的立体仓库系统设计

利用青岛大学—西门子共建小型自动化实验室良好的软硬件环境和学习条件,基于WinCC flexible及西门子S7-200PLC实现了对立体仓库系统的设计。利用WinCC flexible与PLC之间通过工业标准通信协议MPI多点通讯协议进行通信的方式,完成了对立体仓库模型系统的实时监控。实验证明,系统具有很高的实时性和可靠性。     

A time allocation study of university faculty

Many previous time allocation studies treat work as a single activity and examine trade-offs between work and other activities. This paper investigates the at-work allocation of time among teaching, research, grant writing and service by science and engineering faculty at top US research universities. We focus on the relationship between tenure (and promotion) and time allocation, and we find that tenure and promotion do affect the allocation of time. The specific trade-offs are related to particular career paths. For example, full professors spend increasing time on service at the expense of teaching and research while longer-term associate professors who have not been promoted to full professor spend significantly more time teaching at the expense of research time. Finally, our results suggest that women, on average, allocate more hours to university service and less time to research than do men.     

基于S7 200 SMART PLC和组态王的雾炮机控制系统设计

为了实现对多台雾炮机的集中管理、合理雾化除尘,提出了基于S7 200 SMART PLC与组态王的雾炮机控制系统设计方案:将S7 200 SMART PLC作为控制系统的现场控制装置,通过继电器输出控制雾炮机中的被控电机;利用组态王软件对控制系统进行设计,实现工作模式的选择、工作指令的下达及对设备状态的监视;通过TCP/IP方式实现PLC与上位机之间的实时通信。现场运行结果表明,该控制系统运行良好,操作灵活简单,提升了雾炮机的工作效率。