Why is the tare value changing on my HI 1746WS?

The tare value in my HI 1746WS is changing back to the gross weight value after 10 seconds. The tare bit is being toggled on and off using output word 14, bit 1 set on and then off. The motion bit is off, monitoring input word 15 bit 6, when the tare bit is being set.

I am checking the parameter values in the M files by reading the M1 file starting at word 28, and comparing these values to my parameter values. If they do not match, I write my values into the module.

What am I doing wrong?

If you are doing a compare on the 37 words in the direct M files and if the compare failed, then the program re-wrote (copied) the 37 words. The following word values change in the M file, tare weight (28), and set points values (30-44). The tare weight changes in word 28 whenever a tare Command is performed. So there would be a compare error after every tare operation and you would overwrite the tare value with the old value. This would basically undo your tare.  Limit the time at which you do the compare to startup only or do not include the Tare Weight in the compare.