Function Description
The function block UA_Connect is used to create a transport connection for an OPC-UA session. The connection is terminated by calling UA_Disconnect after establishing the connection.
CONNECTIONHDL DWORD output has to be given in input to other blocks. It identifies the Client connection to the given ServerEndPointUrl.
Up to 64 connections in parallel using UA_Connect.
For each connection, to read up to 256 nodes of simple type, and to write up to 128 nodes of simple type.
Each OPC UA client can access the targeted UA server only by the embedded Ethernet ports of CPUs or the external port of the BMENUA0100 module.
Representation in FBD
Parameter Description
Input parameters:
| CAUTION | |
|---|---|
UNEXPECTED BEHAVIOR OF APPLICATION Do not use a wrong address parameter for "SERVERENDPOINTURL".
For instance, do not set an address parameter that does not correspond
to the targeted equipment. Failure to follow these instructions can result in injury or equipment damage. | |
Name |
Type |
Comment |
|---|---|---|
EXECUTE |
BOOL |
On rising edge connection is started. |
SERVERENDPOINTURL |
string[255] |
URL |
SESSIONCONNECTINFO |
Specifies the connection information required to create an OPC UA session |
|
TIMEOUT |
TIME |
Maximum time to establish the connection. |
Name |
Type |
Comment |
|---|---|---|
DONE |
BOOL |
Signals a connection has been successfully established. |
BUSY |
BOOL |
The FB is not finished and new output values are to be expected. |
ERROR |
BOOL |
Signals that an error has occurred within the FB. |
ERRORID |
DWORD |
|
CONNECTIONHDL |
DWORD |
Connection handle is valid until UA_Disconnect is called. |
Runtime Error
Refer to the Appendix for a list of OPC UA detected error codes.