In the meantime, here is an example on using string parameters from subsystem mask inside the REXLANG code (without using the CNS function block). The CNS block is present in the example project but it is not used anywhere.

And thanks for spotting the copy-paste error in the documentation.

Let me know if this solves your needs.

Kind regards,
Jaroslav

What is the best way to do this?

I wanted to use GetExtString together with a CNS FB but I have problems to use the string inside the REXLANG FB. If I send it straight to an output then it is working fine but if I assign it to a string variable I always get an error.

This is working fine :

string output(0) dataOut;

long init(void)
{	
	return 0;
}

long main(void)
{
	dataOut = GetExtString(".CNS_IN1_name:sy");
	return 0;
}

long exit(void)
{	
	return 0;
}

For the following code I always get the error code -504:Invalid numeric address);

string output(0) dataOut;

string tempString[20];

long init(void)
{	
	return 0;
}

long main(void)
{
	tempString = GetExtString(".CNS_IN1_name:sy");	
	dataOut = tempString;
	return 0;
}

long exit(void)
{	
	return 0;
}

...and if I replace

tempString = GetExtString(".CNS_IN1_name:sy");

by

tempString = "testString";

then it is working fine again.

BTW, I also think that the following is not correct inside the REXLANG docu.