Technical data

Configuring Messages
16.1 The Message Concept
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 343
Modifying Data Of Message Types
Whether or not the modification of data at message types has an influence on the instances
depends on whether you have assigned message numbers globally to the project (project-oriented
message numbers) or to the CPU (CPU-oriented message numbers) when you generated your
project.
• Assigning project-oriented message numbers: When you subsequently modify message type
data you also want to apply to the instances, you must also modify data at the instances
accordingly.
• Assigning CPU-oriented message numbers: Subsequent modifications of message type data
are automatically applied at the instances.
Exceptions: You have previously modified data at the instance or have subsequently locked or
unlocked message type data. If you copy an FB and an instance DB from a project with
project-oriented message numbers to a project with CPU-oriented message numbers, you will
then have to change the data at the instance in the same way you did it at the message type.
Caution:
• When you copy the instances to another program and do not include the message type, the
instance might only be partially displayed. To remedy, copy the message type to the new program.
• If texts and attributes for an instance are displayed in green, this means the following: these texts
and attributes are still as they were configured in the message type. They have not been changed
at the instance.