Specifications

2 S7-1200/1500 Innovations

2.2 Terms

Programming Guideline for S7-1200/1500

V1.2, Entry ID: 81318674

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Figure 2-2: Terms associated with tags and parameters

FC / FBGlobal DB

3 4

Table 2-1: Terms associated with tags and parameters

Term Description

1. Tag Tags are reserved memory areas for values in the

controller. Tags are always defined with a certain data

type (Bool, Integer, etc.):

 PLC tags

 Single tags in data blocks

 Complete data blocks

2. Tag value Tag values are values stored in a tag (e.g., 15 as value

of an Integer tag).

3. Actual parameter Actual parameters are tags interconnected at the

interfaces of instructions, functions, and function blocks.

4. Formal parameter

(transfer parameter,

block parameter)

Formal parameters are the interface parameters of

instructions, functions, and function blocks (Input,

Output, InOut, Temp, Static, and Return).

Note

You will find further information in the following entries:

What entries are available on the internet for the migration to STEP 7 (TIA

Portal) and WinCC (TIA Portal)?

http://support.automation.siemens.com/WW/view/en/58879602

What prerequisites have to be fulfilled in order to migrate a STEP 7 V5.x project

into STEP 7 Professional (TIA Portal)?

http://support.automation.siemens.com/WW/view/en/62101406

PLC migration for S7-1500 with STEP 7 (TIA Portal) V12

http://support.automation.siemens.com/WW/view/en/67858106

Programming recommendations for S7-1200 and S7-1500 with STEP 7 (TIA

Portal) V12

http://support.automation.siemens.com/WW/view/en/67582299

Why is it not possible to mix register passing and explicit parameter transfer with

the S7-1500 in STEP 7 (TIA Portal) V12?

Among others, the migration of STL programs to S7-1500 is described in this

entry.

http://support.automation.siemens.com/WW/view/en/67655405