Specifications

3 General Programming

3.5 Retentivity

Programming Guideline for S7-1200/1500

V1.2, Entry ID: 81318674

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Figure 3-21: Program editor (Functions block interfaces)

Figure 3-22: Program editor (Data block)

Example: Retentive of PLC tags

The setting of the retentive data is performed in the tables of the PLC tags, function

blocks and data blocks.

Figure 3-23: Setting of the retentive tags in the table of PLC tags

Retentivity can be set from

address 0 onward!

e.g. from MB0, T0 or C0

Example: Retentive counter

You can also declare instances of functions (timer, counter, etc.) retentive. As

already described in chapter 3.2.5 Multi-instances