Siemens SIMATIC S7-1200 Produktinformation Seite 19

Restrictions when configuring the retentive behavior of data blocks
The configuration of the retentive behavior of data blocks is not supported for F-DBs. This means that the actual values of the
F-DBs will not be retentive in the event of POWER OFF/POWER ON and restart (STOP-RUN) of the F-CPU. The F-DBs retain the
initial values from the load memory.
The "Retain" check box is grayed-out for all tags in F-DBs.
Configuration control (option handling) on an S7-1200 F-CPU
Configuration control (option handling) on an S7-1200 F-CPU is possible with central modules subject to the following
limitation:
• The fail-safe S7-1200 modules cannot be swapped and must also always be physically inserted into their configured slot.
Position the fail-safe S7-1200 modules directly next to the F-CPU. Position the standard modules on the right next to the fail-
safe S7-1200 modules.
Procedure for loading a configuration for firmware < V2.0 for S7-1500 F-CPUs
If you have loaded an S7-1500 F-CPU with a configuration for firmware as of V2.0 with configured protection level "Full
access incl. fail-safe (no protection)" and you now want to load a configuration for firmware <= V1.8 to this F-CPU, you must
observe the following:
When the configuration with firmware <= V1.8 is loaded to the F-CPU, you will be prompted to enter the password and the
entered password will be identified as invalid.
As a remedy, format the SIMATIC Memory Card as described in the online help for STEP 7 under "Formatting an S7-1500
memory card". You can then load the configuration for firmware <= V1.8 to the F-CPU.
Procedure for loading a configuration for firmware V4.1 S7-1200 F-CPUs
If you have loaded an S7-1200 F-CPU with a configuration for firmware as of V4.5 with configured protection level "Full
access incl. fail-safe (no protection)" and you now want to load a configuration for firmware 4.1 to this F-CPU, you must
observe the following:
When the configuration with firmware V4.1 is loaded onto the F-CPU, you are prompted to enter the password and the
entered password will be identified as invalid.
As a remedy, format the SIMATIC Memory Card if you are working with an external load memory (SIMATIC Memory Card). If
you are working with the internal load memory, proceed as you would for a lost password. You can then load the
configuration for firmware V4.1 to the F-CPU.
Migrating or upgrading to TIA Portal V17 or higher
When migrating or upgrading to TIA Portal V17 or higher and current firmware (S7-1500F V2.9/S7-1200F V4.5), we
recommend that you create a new backup file.
If the existing backup file is still used, an access authorization for the F-CPU may be required when restoring the software and
hardware configuration of the F-CPU.
Use of isochronous mode interrupt (F-)OBs
The number of isochronous mode interrupt (F-)OBs depends on the F-CPU used. You can obtain information in the technical
specification of the F-CPU.
If the sum of the isochronous mode interrupt OBs and the isochronous mode interrupt F-OBs exceeds the number specified in
the technical specifications of the F-CPU, it is no longer possible to load the standard user program in RUN.
F-diagnostic messages with an S7-1500 HF CPU
Note
On a redundant system S7-1500HF, F-diagnostic messages are entered duplicated on both HF-CPUs (primary and backup
CPU).
If one of the two HF CPUs is not available (e.g. STOP, POWER OFF, etc.), then the F-diagnostics is simply entered on the
accessible HF CPU only. When the redundant HF-CPU returns, the diagnostics is duplicated again.
Warnings S055, S090 and S091 with an S7-1500 HF CPU
The following update applies to warnings S055, S090 and S091:
You must perform program identification for all three warnings on both the primary and backup CPUs in the RUN-Redundant
mode.
While doing so, you must ensure via the display, e.g. in TIA Portal, that you perform the program identification on both the
primary and backup CPUs. You can recognize this in the project tree by the "P" or "B" icon in the online view.
F-CPUs
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