Client (FB)¶

FUNCTION_BLOCK PUBLIC FINAL Client EXTENDS CBML.LConC IMPLEMENTS IClient

Function block for establishing a connection to an OPC UA server.

Usage (Declaration):

sPolicySHA256 : STRING := 'http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256';
sURL  : STRING := 'opc.tcp://xxx:4840';
sSession : STRING := 'urn:xxx:CODESYS:UA.Client';

UAPolicy : UA.SecurityPolicy := (
    sPolicy:=sPolicySHA256,
    eSecurity:=UA.SECURITY_MODE.SIGN_AND_ENCRYPT
);

UAAuth : UA.UserNameAuth := (sUserName:=sUser, sPassword:=sPass);

UAClient : UA.Client := (
    sURL := sURL,
    sSession := sSession,
    itfPolicy := UAPolicy,
    itfAuth := UAAuth,
    udiTimeout := 100000
);

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	xEnable	BOOL			LConC
Output	xBusy	BOOL			LConC
	xError	BOOL			LConC
Input Const	itfAsyncProperty	IAsyncProperty	0
	sClientName	STRING	‘CODESYS OPC UA Client’
	sURL	URL
	sSession	SESSION
	itfPolicy	ISecurityPolicy	0
	itfAuth	IAuthentication	0
	udiTimeout	UDINT	0
	itfNamespaceArray	INamespaceArray	0
Output	eErrorID	ERROR
	xActive	BOOL		TRUE if a Connection is established
	itfConnection	IConnection		The established connection to the related server Valid, as long xActive = TRUE
	eState	CONNECTION_STATE	CONNECTION_STATE.UNKNOWN

Methods:

SetInitialValue

GetConnection

Structure: