Requirements for use
2.3 Programming
CP 342-5 / CP 342-5 FO
12
Manual, 10/2011, C79000-G8976-C146-09
NOTICE
Changing bus parameters
If you change the bus parameters in the configuration data, you must not load this
configuration data on the CP via PROFIBUS!
Note
Extensive configuration
Before loading an extensive configuration over a previous configuration, you should run a
memory reset on the CP.
By doing this, you avoid the configuration storage space on the CP being exceeded. If the
configuration storage space on the CP is not adequate, the diagnostics buffer of the CP
reports a lack of resources when you download the configuration data.
Replacing a module without a programming device
The CP supports the option of storing the configuration data of the CP on the CPU. If you
use this option, this means that module replacement is possible without having to load the
configuration data from the PG again.
The configuration data is then stored in load memory of the CPU. Storage of the
configuration data is protected from power failure by the battery backup or the EPROM
module card in the CPU.
2.3
Programming
Program blocks
For some communications services, there are preprogrammed functions and function blocks
(FCs / FBs / instructions) available as the interface in your STEP 7 user program.
NOTICE
Current program blocks
We recommend that you always use the latest block versions for all module types.
You will find information on the current block versions and the current blocks to download
from the Internet in our Customer Support under entry ID:
8797This recommendation assumes that you are using the latest firmware for the particular
module type.
