The PROMOTIC system allows the access to functions (methods) of external DLL libraries by means of the PmDll object. The most often examples how to use them, are as follows:
Producers of input/output HW cards (Axiom, Advantech, ADlink, etc.) supply drivers for most HW cards for PC.
The drivers are DLL libraries for OS Windows in most cases, they are available on the Internet pages of the card producers and they are mostly free of charge. By means of the PmDll object it is possible to call functions of these DLL libraries, for example, read/write binary or analog signals, etc.
Usage of the PmDll object requires purchase of the PmDLL license. With the freeware version PmFree, or when developing the application (with development environment for tersting purposes), this component is always functional.