You can switchvariable density OFF to allow any swings in the solution to stabilize, and then restart the analysis.
可以关闭易变的密度使求解稳定，然后重启分析。
2
System's analog variable, switchvariable collect unit and switchvariable output unit can monitor and control some equipment, such as air-condition, ventilator and fire alarm equipment.
系统的模拟量及开关量采集单元和开关量输出单元可以监控空调、通风机、火警等装置。
3
Defining a variable here makes it easy to switch to another data source.