Fix exception generated when writing to SINT variable and SINT Array … #455
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…using write_to_list_by_name function
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…using write_to_list_by_name function.
The problem was the line ADST_INT8: PLCTYPE_BYTE, in the file: pyads.constants.py.
Because of this, the following exception was generated when writing negative values to the SINT variable or an Array of SINT: "ubyte format requires 0 <= number <= 255".
The correct way is to use: ADST_INT8: PLCTYPE_SINT, because PLCTYPE_SIN is actually c_byte from ctypes library and not c_ubyte. PLCTYPE_BYTE is c_ubyte and that generated the exception.