Technical data

Configuring Messages
16.1 The Message Concept
Programming with STEP 7
334 Manual, 05/2010, A5E02789666-01
Message Numbering
Message numbering requires the programmer to perform only one step:
• Create the user program on the programming device, set the required bit, and assign the
required message text to the bit directly while programming.
There is no cyclic query of the programmable controller. When the programmable controller signals
a change, the corresponding message number is passed to the operator interface system and the
corresponding message text is displayed. The message receives the time stamp from the
programmable controller and can therefore be traced more exactly than with bit messaging.