How to Use HMI to Display the Data of Load Cell?

A load cell is a force transducer. It converts a force such as tension, compression, pressure, or torque into an electrical signal that can be measured and standardized. As the force applied to the load cell increases, the electrical signal changes proportionally. We covered How to use PLC to monitor the data of load cell transmitter in our previous blog. Today we'll show you how to use HMI to display the data of load cell in real time.

PLC programming

There is a delay program T005 in the middle. When T005 time is up, the analog data will be stored in D0.

We can see the real-time data of D0 storage area from PLC online monitoring. A 2kg weight id placed on the sensor, and the weight data N is transmitted to D0.

The value of N is about 240 (because the output of the transmitter has an error amount, so the PLC display data is 239).

HMI programming

Right-click the mouse and sele "Numeric Display" to draw a data display box. We also need to set the monitoring memory area (PLC weighing data storage area D0).

See the display data font.

Set the magnification data multiple (calculation method as above).Then download to HMI.

We know that the data 240 (239) of D0 means that the load is 2kg at this time. We simulate the display weight of the HMl under the condition of 5V input from the transmitter (conditions: 0~10V output from the transmitter，50,000q=10V at full load).

Accordinq to the chart, when the transmitter outputs 10V (50,000q), the data received by the PLC is 6000. So when the data received by the PLC is 3000, the transmitter should output 5V (load 25,000g).

When the data of monitoring PLC D0 is 3000, it can be found that the load weight displayed on the HMI is 25,000g.

If you want to know more details about how to use HMI to display the data of load cell, please click the video below.