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2 S7-1200/1500 Innovations
2.2 Terms
Figure 2-2: Terms associated with tags and parameters
Global DB
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FC / FB
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3
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Table 2-1: Terms associated with tags and parameters
Copyright
Siemens AG 2014 All rights reserved
Term
Note
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).
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
Programming Guideline for S7-1200/1500
V1.2, Entry ID: 81318674
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