Today, I would like to share a practical case involving a water level control project using PLC, inverter, and touch screen. Let’s take a look at the entire process, which you can save for future reference!
● Project Description
● EM235 Module
● Project Implementation
● Touch Screen Monitoring
1. Project Description
1. Project Control Requirements
The water tank supplies water to external users, with water consumption being unstable, sometimes high and sometimes low. Water is pumped into the tank, and we need to maintain a constant water level control within a range of 0~200mm (the maximum value can be determined based on the height of the tank). For example, if the set water level is 100mm, regardless of the outflow, the inflow must be adjusted to keep the water level at 100mm. If the outflow is low, the inflow should also be controlled to be low; if the outflow is high, the inflow should be controlled to be high.
2. Control Strategy
Since the liquid level height is proportional to the water pressure at the bottom of the tank, a pressure sensor can be used to detect the pressure at the bottom of the tank to determine the liquid level height. A PD algorithm is used for automatic adjustment of the water level. The water level signal detected by the pressure sensor (4~20mA) is sent to the PLC, where the PID calculation is performed on the deviation between the set value and the detected value. The calculation result is output to adjust the speed of the water pump motor, thereby regulating the inflow. The speed of the water pump motor can be controlled by the inverter.
3. Component Selection
1) PLC and Module Selection. The PLC can be selected as S7-200 CPU224. To receive the analog signal from the pressure sensor and adjust the water pump motor speed, an EM235 analog input/output module is chosen.
2) Inverter Selection. To adjust the inflow, a Siemens G110 inverter is selected.
3) Touch Screen Selection. A Siemens TP170B touch screen is selected.
4) Water Tank Equipment, as shown in the figure below.
2. EM235 Module
1. EM235 Terminals and Wiring
3. Project Implementation
1. PLC IO Allocation and Circuit Diagram
PLC IO Allocation
Start Button, 10.0;
Stop Button, 10.1;
Q0.0, controls the operation of the water pump motor.
Source / Network
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