Calling a external C application from a CPLC

[tecnico]

Hi all,

I know I can run an external C program (of course after compiling it ;-)) from within a PLC with this command:

 

system " /usr/local/bin/xxx/capp1"

 

but what if I want to call this app from within a CPLC ? Is this possible?

[steve.milici]

There are a couple of options.

 

You could “force-feed” your first method through the PMAC command interpreter with the “Command()” or “GetResponse()” PMAC API function (Gp Library Functions in gplib.h).

 

Another method is using the standard C system() function to pass a command string back to Linux.