Connect to Siemens S7-1200

The Siemens S7-1200 PLC is programmed via Siemens’ TIA Portal (Totally Integrated Automation Portal) software. Once you’ve installed the TIA Portal, you can design, test, troubleshoot, and maintain your automation project in a single software suite, with a standardized and intuitive navigation system to configure and program your S7-1200 PLC, as well as other Siemens automation devices.

This section introduces how to leverage Nuron OPC UA plugin to connect S7-1200.

Username/Password Login

1. Select the target PLC in the TIA V16 programming software, right-click and open the Properties -> General -> OPC UA.

2. Open the Activate OPC UA Server option.

3. 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.

4. Check Automatically accept client certificates during runtime in the Trusted client section.

5. Turn off Enable guest authentication in the Guest authentication section.

6. Check the Enable username and password authentication box in the Username and password authentication section.

7. Adding a user name and password to the User Management list.

8. Downloading programs to the PLC.

Add Program Blocks

1. 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.

2. Check the Accessible from HMI/OPC UA/Web API and Writable from HMI/OPC UA/Web API options for all data points.

3. Download programe to PLC.

Add Server Interfaces

1. 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.

2. Download programe to PLC.

Configure Neuron

1. Get the PLC measurement point information via the UaExpert software, refer to UaExpert.

2. 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.

3. Add Groups and Tags based on the measurement point information.

   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.

   The data type mapping relation is as follows:

   PLC Data Type	OPC UA Data Type	Neuron Data Type
   AOM_IDENT	UInt32	UINT32
   Bool	Boolean	BOOL
   Byte	Byte	UINT8
   CONN_ANY	UInt16	UINT16
   CONN_OUC	UInt16	UINT16
   CONN_PRG	UInt16	UINT16
   Char	Byte	UINT8
   DB_ANY	UInt16	UINT16
   DB_DYN	UInt16	UINT16
   DB_WWW	UInt16	UINT16
   DWord	UInt32	UINT32
   Date	UInt16	UINT16
   DInt	Int32	INT32
   EVENT_ANY	UInt32	UINT32
   EVENT_ATT	UInt32	UINT32
   EVENT_HWINT	UInt32	UINT32
   HW_ANY	UInt16	UINT16
   HW_DEVICE	UInt16	UINT16
   HW_DPSLAVE	UInt16	UINT16
   HW_HSC	UInt16	UINT16
   HW_IEPORT	UInt16	UINT16
   HW_INTERFACE	UInt16	UINT16
   HW_IO	UInt16	UINT16
   HW_IOSYSTEM	UInt16	UINT16
   HW_PWM	UInt16	UINT16
   HW_SUBMODULE	UInt16	UINT16
   Int	Int16	INT16
   LReal	Double	DOUBLE
   OB_ANY	Int16	INT16
   OB_ATT	Int16	INT16
   OB_CYCLIC	Int16	INT16
   OB_DELAY	Int16	INT16
   OB_DIAG	Int16	INT16
   OB_HWINT	Int16	INT16
   OB_PCYCLE	Int16	INT16
   OB_STARTUP	Int16	INT16
   OB_TIMEERROR	Int16	INT16
   OB_TOD	Int16	INT16
   PIP	UInt16	UINT16
   PORT	UInt16	UINT16
   RTM	UInt16	UINT16
   Real	Float	FLOAT
   SInt	SByte	INT8
   String	String	STRING
   Time	Int32	INT32
   TimeOfDay	UInt32	UINT32
   UDInt	UInt32	UINT32
   UInt	UInt16	UINT16
   USInt	Byte	UINT8
   WChar	UInt16	UINT16
   WString	String	STRING
   Word	UInt16	UINT16

Test Data List 1

Test Data List 2