opened com port or RTS_INVALID
StorageWriterBufferClient instance is invalid
StorageWriterListener instance is invalid
may be invalid: In
_IEC_HANDLE Handle or RTS_INVALID
Add ASYNCSTATE_INVALID UDINT
: (ASYNCSTATE_INVALID
CommFB.Constants.INVALID
_FPU_DIVIDEBYZERO UDINT 16#152 RTSEXCPT_FPU_INVALID