Hi Claes,

When using GetExtString in version 5.5, a compiler warning is issued (see attached). The warning concerns strncpy incompatible pointer type [ Wincompatible-pointer-types]. Our external strings being read are null terminated. If this warning is ignored, the PLC program works correctly.

Any suggestions?

Regards,
Ron

Hi Ron,

To get rid of the warning, edit src/lib/rt/src/rt_plc_macro_io.h and change the GetExtString macro:

strncpy(obj->ActVal, obj->ExtP, sizeof(pwr_tString80)); ->
strncpy(obj->ActVal, (char *)obj->ExtP, sizeof(pwr_tString80));

/Claes