Overview

General

An OPC unified architecture server (OPC UA server), allowing communication with OPC UA clients for the data exchange, is integrated into the controller firmware.

This chapter provides an overview of the features and functions of the OPC UA server.

The OPC UA server supports data access (DA). The encryptions None, Basic256Sha256, Aes128_Sha256_RsaOaep, and Aes256_Sha256_RsaPss are available for the connection to the OPC UA clients. The authentications "Anonym" and "User name and password" are components of the OPC UA server.

The following data types are supported:

IEC 61131-3	OPC UA types
BIT	Boolean
BOOL	Boolean
USINT	Byte
BYTE	Byte
INT	Int16
DINT	Int32
LINT	Int64
WORD	UInt16
UINT	UInt32
TIMEOFDAY	UInt32
TIME	UInt32
DWORD	UInt32
UDINT	UInt32
LTIME	UInt64
LWORD	UInt64
ULINT	UInt64
REAL	Float
LREAL	Double
STRING	String
SINT	SByte
DATEANDTIME	DateTime
DATE	DateTime
ARRAY	Object
USERDEF (FB)	Object
NONE (folder)	Object

In addition to IEC base data types, the OPC UA server can also expose OPC UA variables from IEC symbols that are composed of the following complex types:

Arrays and Multi-Dimensional Arrays. These are limited to 3 dimensions.
Structured data types, and nested structured data types. As long as they are not composed of a UNION field.

OPC UA Server Directory Structure

The directory opcua with the following structure was added to the memory card of the controller:

Directory	Contents
ide0:\ESystem\opcua	The server configuration file ServerConfig.ini is located in this directory.
ide0:\ESystem\opcua\pki\own	The server certificate is located in this directory.
ide0:\ESystem\opcua\pki\rejected	The client certificates that the server does not trust are located in this directory. See also Client certificate management and Enabling security.
ide0:\ESystem\opcua\pki\trusted	The client certificates that the server trusts are located in this directory. See also Client certificate management and Enabling security.