1、 Questions Of PLCs Using PLC is one kind of uses in the industrial production automation control equipment, generally does not need to take any measure, may directly use in the industry environment. However, although it has the reliability which like on states high, antijamming ability stronger, but
2、 works as production environment is too bad, electromagnetic interference specially intense, or installs uses is improper, possibly creates the program error or the operation mistake, thus produces inputs by mistake and causes outputs by mistake, this will be able to create the equipment out of cont
3、rol and the disoperation, thus will not be able to guarantee PLC the normal operation, will have to enhance the PLC control system reliability, on the one hand will request PLC to produce the factory to enhance the equipment the antijamming ability; on the other hand, in the request design, the inst
4、allment and the use maintenance cause highly takes, coordinates to be able in every way to consummate solves the problem, effectively strengthens the system the resistance to interference. Below therefore should pay attention to the question in the use: 1. Working conditions The temperature PLC requ
5、est ambient temperature when 055, installs cannot put under the calorific capacity big part, all around ventilates the radiation the space to be supposed enough to be big. The humidity In order to guarantee PLC the insulating ability, the air relative humidity should be smaller than 85% (not to cong
6、eal dew). The vibration We should cause PLC to be far away the intense vibration source, prevented the vibration frequency is 1055Hz is frequent or the vibration. When use environment inevitable vibration, must take the absorption of shock measure, like uses the absorption of shock rubber and so on. The air To avoid having the corrosion and the flammable gas, for example Hydrogen chloride, hydrogen sulfide and so on. Has more dust or the caustic gas environment regarding the air in,
