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I have start with 0.1 setting and does not work.
Reads only the inputs at startup but can not set outputs neither led in ioc32 blinks.
I was thinking the works but because saw input pin lighting in halshow but when try
to set out pin not works neither
data transfer modbus led blinking in ioc32

The error when setting the update rate to 0 is that you cannot change it
after this has been done:

   "If you ever set the update rate to 0 (maximum), changing to a
    non-zero rate will not work (communication stops)"

I have no issue with the ioc32 running at 9600 baud at a .1 second update rate.

 The bug is in either Mesa modbus or the PKTUART driver, not the VHDL.
Most likely the drivers idea of the amount of read data does not match
the actual amount returned, so data from one module is mixed with the
previous or subsequent modules data.

It could also conceivably be a memory/stack issue in the modbus or PKTUART driver.