SIWAREX-P integrating to S5PLC


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I have connected one SIWAREX-P unit fully calibrated and it is delivering 0-20ma with respect to zero and span value. Also the signals connected in the PLC which is reading as per the change in the load.

My prolerm is I would like to subtract the initial load with last weighing load. Once the bin is on the platform the bin is having weight of about 50 to 75tons. The process filling weight is about 145 to 165tons.

I would like display only the process weight in the HMI. Please help me solve this problem. I can create & read the data word in the PLC. The problem is storing the initial value and subtracting with the final value & displaying it on HMI