When the electric valve is opened or closed, the delay time is set according to the opening and closing time of the valve. After the delay detection is turned on or off, if these signals cannot be accurately returned to the PLC on time, the valve may be faulty and the valve may be used. Fault alarm processing. The program design is shown in Figure 3b Shown. X2 is the valve opening condition, Y1 is the control valve action output, the timer timing time is greater than the valve opening time, X3 is the valve in-position return signal, and R1 is the valve fault position. 6 Conclusion We adopted the above method in the design of the automatic control system of Shengli Oilfield Shengli Oil Production Plant. After nearly 2 years of operation, the adoption of these methods is effective for improving system reliability. Previous page Pvc Profiles,Upvc Profiles,Pvc Window Profile Scaffold Accessories,Bulding Projects Accessories Co., Ltd. , http://www.chaluminumextrusion.com
The fault has a memory function and is cleared by the fault reset button.