Connect to Siemens S7-1200

Select the target PLC in the TIA V16 programming software, right-click and open the Properties -> General -> OPC UA.
Open the Activate OPC UA Server option.
Check the required security policy in the Security policies available on the server list. If the security requirement is not particularly high, you can just check No security, so that the speed of reading and writing requests will be faster.
Check Automatically accept client certificates during runtime in the Trusted client section.
Turn off Enable guest authentication in the Guest authentication section.
Check the Enable username and password authentication box in the Username and password authentication section.
Adding a user name and password to the User Management list.
Downloading programs to the PLC.

Add program blocks

Select the target PLC in the TIA V16 programming software, open Program blocks -> Add New block, add a Global DB block named OPC UA Block, add a data point for each type in the OPC UA Block, set the Name to the same type as the Data Type.
Check the Accessible from HMI/OPC UA/Web API and Writable from HMI/OPC UA/Web API options for all data points.
Download programe to PLC.

Select the target PLC in the TIA V16 programming software, open OPC UA communication -> Server interfaces -> Add new server Interface, add the interface named ServerInterfaces_1, drag the OPC UA Block in the OPC UA elements -> Project data -> Program block on the right to the OPC UA server interface -> Browse name -> under ServerInterfaces_1.
Download programe to PLC.

To view the PLC measurement point information via the UaExpert software, Refer to UaExpert usage.
Neuron adds a new southbound OPC UA device, open Device Configuration, fill in the Endpoint URL of the target PLC, user name/password, no need to add certificate/key.
Add Groups and Tags based on the measurement point information.

Data type mapping:

Name	Address	Attribute	Date type
DeviceManual	3!DeviceManual	Read	STRING
DeviceRevision	3!DeviceRevision	Read	STRING
EngineeringRevision	3!EngineeringRevision	Read	STRING
HardwareRevision	3!HardwareRevision	Read	STRING
OperatingMode	3!OperatingMode	Read	INT32
OrderNumber	3!OrderNumber	Read	STRING
RevisionCounter	3!RevisionCounter	Read	INT32
SerialNumber	3!SerialNumber	Read	STRING
SoftwareRevision	3!SoftwareRevision	Read	STRING

Name	Address	Attribute	Data type
SInt	4!12	Read Write	INT8
Int	4!9	Read Write	INT16
DInt	4!6	Read Write	INT32
Byte	4!4	Read Write	UINT8
UInt	4!17	Read Write	UINT16
UDInt	4!16	Read Write	UINT32
Real	4!11	Read Write	FLOAT
LReal	4!10	Read Write	DOUBLE
Bool	4!3	Read Write	BOOL
String	4!13	Read Write	STRING

TIP

The NODEID of the Siemens S7-1200 is in digital form and the address of the Neuron needs to be set according to the actual value.