- Create a "Standard project" and select CODESYS Control Win V3 as the device.
- Define the target system by means of the Network scan.
- Open the Library Manager and add the Netzwork library.
Add a global variable list to the project and define the following variables:
Section Column width 93 Code Block theme Confluence {attribute 'qualified_only'} VAR_GLOBAL sIpAddr : NBS.IP_ADDR := (sAddr := '192.168.99.74'); // Change to own IP-Address // !!! Make sure that the firewall does not block these ports !!! uiPort : UINT := 8181; // Port for the sender => receiver will set to uiPort + 1 END_VAR
Add a POU to the project and name is UdpClient.
Adapt the POU UdpClient as follows:
Section Column width 7 Declaration
Column width 93 Code Block theme Confluence VAR fbPeerClient : NBS.UDP_Peer; fbReceive : NBS.UDP_Receive; sRcvMsg : STRING; END_VARSection Column width 7 Implementation
Column width 93 Code Block theme Confluence fbPeerClient(xEnable := TRUE, ipAddr:= GVL.stIpAddr, uiPort:= GVL.uiPort + 1); fbReceive(xEnable := (fbPeerClient.hPeer <> CAA.gc_hINVALID), hPeer := fbPeerClient.hPeer, szSize := SIZEOF(sRcvMsg), pData := ADR(sRcvMsg));
Adapt the POU PLC_PRG as follows:
Section Column width 7 Deklaration
Column width 93 Code Block theme Confluence VAR fbPeerServer : NBS.UDP_Peer; fbSend : NBS.UDP_Send; xSend : BOOL; sSendMsg : STRING := 'Hello World'; END_VARSection Column width 7 Implementierung
Column width 93 Code Block theme Confluence UdpClient(); fbPeerServer(xEnable := TRUE, ipAddr := GVL.stIpAddr, uiPort := GVL.uiPort); IF fbPeerServer.hPeer <> CAA.gc_hINVALID THEN fbSend(xExecute := xSend, hPeer := fbPeerServer.hPeer, ipAddr := GVL.stIpAddr, uiPort := GVL.uiPort + 1, szSize := SIZEOF(sSendMsg), pData := ADR(sSendMsg)); END_IF IF xSend THEN xSend := FALSE; END_IF
- Start the project and set the xSend variable to TRUE.
