The document specifies communication aspects of a programmable controller. It specifies from the viewpoint of a PC how any device can communicate with a PC as a server and how a PC can communicate with any device.
DIN EN 61131-5:2001 history
2001DIN EN 61131-5:2001-11 Programmable controllers - Part 5: Communications (IEC 61131-5:2000); German version EN 61131-5:2001
2001DIN EN 61131-5:2001 Programmable controllers - Part 5: Communications (IEC 61131-5:2000); German version EN 61131-5:2001