S7 protocol settings

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S7 CPU

In Siemens S7 controllers and compatible the connection parameter details will be defined automatically.

 

If you have not set up the control online, the control type is not recognized.

 

If you are using a controller of the S7-1500 family, please select "s7 1500".

The own TSAP is hex: 06 00

The remote TSAP is hex: 53 49 4D 41 54 49 43 2D 52 4F 4F 54 2D 45 53

    As text: SIMATIC-ROOT-ES

 

In rare cases, with very old controllers and compatibles, the S7-200 protocol must be selected manually.

 

For the item access of S7-200, 300 and 400 please use the S7 item syntax.

Show symbol comments

To reduce communication via OPC, symbol comments can be disabled.

Use array start index

Some fields in the PLC do not start with 0, as is common in C programming and OPC UA. In this case, the corresponding offset of the PLC program is used with this setting.

For compatibility with earlier versions, this option is disabled, but should be enabled.

Allow Item Syntax

With S7-1500 and S7-1200, item syntax is possible for non-optimized blocks, even though the modern and secure TIA protocol is used.

The item syntax would then be, for example:

PLC1,ItemSyntax.DB1.DBW0

where PLC1 is the connection name, "ItemSyntax" is a fixed component, and the familiar item syntax of the S7-300/400 can be used after it. All separated by a period.

If the fixed component "ItemSyntax" is causing problems, it can be redirected and eliminated via a virtual redirect connection.

If the controller is configured as a S7 1500 the variable access will work with symbol names directly. They can be found over online browsing. An item syntax does not exist in this case.

Use folders in symbol Exploring

Normally the elements are grouped in folders for the inputs, outputs, flags and the data blocks. If you do not like that uncheck the "Use folders in symbol browse".

Show block numbers in comment

The data blocks have numbers. This is true for the optimized data blocks also. Normally the data block numbers are not needed. If you need them please check "Show block numbers". Then the  comments of the data blocks begin with the data block number.

 

Hint:

In the S7 1500 data requested over networks are not synchronized with the PLC cycle. More information in the Siemens PLC manuals.