OPC UA

OPC UA is a machine-to-machine communication protocol for industrial automation developed and maintained by the OPC Foundation. OPC UA provides a standardized way for different devices and systems to communicate with each other.

The Neuron OPC UA plug-in can be used as a client to access KEPServerEX, Industrial Gateway OPC Server, Prosys Simulation Server, Ignition and other OPC UA servers. You can also directly access the built-in OPC UA Server of hardware equipment, such as: the built-in Server of Siemens S7-1200 PLC, the built-in Server of Omron NJ series PLC, etc.

Parameters

Parameter Description
Endpoint URL Target OPC UA Server URL, the default value is opc.tcp://127.0.0.1:4840/
Username User name used to connect to the target OPC UA Server
Password Password for connecting to the target OPC UA Server
Cert Client certificate in DER format
Key The client key in DER format

Data types

  • INT8（OPC UA SBYTE type）
  • INT16
  • INT32
  • INT64
  • UINT8（OPC UA BYTE type）
  • UINT16
  • UINT32（It is also used to indicate the OPC UA DATETIME type）
  • UINT64
  • FLOAT
  • DOUBLE
  • BOOL
  • STRING

Data Type Conversion

OPC UA Data Type Neuron Data Type
SByte INT8
Int16 INT16
Int32 INT32
Int64 INT64
Byte UINT8
UInt16 UINT16
UInt32 UINT32
UInt64 UINT64
Float FLOAT
Double DOUBLE
Boolean BOOL
String STRING
Datetime UINT32

Address format

NS!NODEID

NS Namespace index.

NODEID Node ID. The value can be a number or a string.

Examples

Address Data type Description
0!2258 UINT32 Get the timestamp of the OPC UA server using the digital NODEID. The NS value is 0, and the NODEID is 2258
2!Device1.Module1.Tag1 INT8 Use the string NODEID to get the data point of type SBYTE. If NS is 2, NODEID is Device1.Module1.Tag1

You can use UaExpert software to help you view the namespace index and node ID information for the required points, Refer to UaExpert usage.

For an explanation of namespace indexes and node ids, refer to the OPC UA standard.

The Neuron set data type must match the OPC UA data type.