Selecting The Version Of The Uss Instructions - Siemens SIMATIC S7-1200 System Manual

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Selecting the version of the USS instructions

There are two versions of USS instructions available in STEP 7:

● Version 2.0 (legacy instructions) was initially available in STEP 7 Basic/Professional V13.

● Version 2.1 is available in STEP 7 Basic/Professional V13 SP1 or later.

For compatibility and ease of migration, you can choose which instruction version to insert

into your user program.

You cannot use both versions of the instructions with the same module, but two different

modules can use different versions of the instructions.

When you use the instruction tree to place a USS instruction in your program, a new FB or

FC instance, depending on the USS instruction selected, is created in the project tree. You

can see new FB or FC instance in the project tree under PLC_x > Program blocks > System

blocks > Program resources.

To verify the version of a USS instruction in a program, you must inspect project tree

properties and not the properties of a box displayed in the program editor. Select a project

tree USS FB or FC instance, right-click, select "Properties", and select the "Information"

page to see the USS instruction version number.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Click the icon on the instruction tree task card to enable the headers and columns

of the instruction tree.

Communication processor and Modbus TCP

13.4 Universal serial interface (USS) communication

To change the version of the USS instruc-

tions, select the version from the drop-down

list. You can select the group or individual

instructions.