Chapter 2 0BProgramming Control action The example is the basic design of the water supply of the multi-storey building. The tap-water is automatically supplied to the underground pool, and the water in the underground pool can be transported to the water tower on the top of the building through the pump. The water is distributed to every story in the building by means of gravity, and the action of the pump is controlled by the level switch of the underground pool and that that of the water tower. In order to monitor the water supply, the level meter is installed in the underground pool. The water storage capacity of the underground pool is monitored at all times.
The devices connected to the modules: 1. A single-point level switch (contact A) The single-point level switch is installed in the underground pool, and the signal contact is connected to the digital input module. 2. A two-point level switch (contact A) The two-point level switch is installed in the water tower on the top of the building, and the signal contact is connected to the digital input module. 3. A pump The pump is installed near the underground pool. However, the device to which the PLC actually connects is not the pump but the control panel. Generally speaking, three digital inputs and one digital output are connected to the digital input/output module.
(Remote control x 1 (DI) & Run x 1 (DI) & Trip x 1 (DI) & Start x 1 (DO)) 4. A level meter The level meter is installed in the underground pool, and the signal contact is connected to the analog input module. (0~10V correspond to 0~10M. 0 V represents that the water is 0.0 meters deep, and 10 V represents that the water is 10.0 meters deep.) The control condition of the pump: 1. Start: If the water level inside the water tower is low and that inside the underground pool is not low, the pump will refill the water tower. 2. Stop: If the water level inside the water tower is high, or if the water level inside the underground pool is low, the pump stops running.
2.5 Creating Projects After users install the hardware and understand the control logic in the example, they can write the program. Step 1: Open ISPSoft (Start Programs Delta Industrial Automation PLC ISPSoftx.xx ISPSoftx.xx) The start screen of the software: 2-11