Technical data

Configuring Messages
16.1 The Message Concept
Programming with STEP 7
338 Manual, 05/2010, A5E02789666-01
16.1.4 Parts of a Message
How a message is displayed depends on the messaging method, the message block used, and the
display device.
The possible parts of a message are listed in the following table:
Part Description
Timestamp Generated in the programmable controller when the message event occurs
Message state The following states are possible: incoming, outgoing, outgoing without
acknowledgement, outgoing with acknowledgement
Associated value Some messages can be assigned a process value that can be evaluated by the
message block used
Image If the system crashes the messages that occurred can be displayed subsequently on
the operator station
Message number A unique number throughout the project or CPU (project-oriented or CPU-oriented).
The number is assign by the system and identifies a message
Message texts Configured by the user
Example
The following example shows an alarm message on an operator panel.