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the incrementer counts as expected, but the INV(A+B/n) instruction is not working.  I can force any number into the MI variable at B or C position of this instruction and it does not change from the program running.  The instruction is not running all the time, but should be at this time.

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I was wrong.  Current OS version was V5.04 (B41).  I updated to V5.04 (B54) and the floating point convert seems to be working.


Can you give me an idea as to which version of the OS I might have trouble with?  I have many machines around the world with this same V120 PLC installed.  Only recently have we noticed any problems with the floating point math?



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