Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP, Manual

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3 Basics on Control Messages (PLC Alarms)
Monitoring of 24 V load circuits
Entry-ID: 61450284, V1.1, 05/2014
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3 Basics on Control Messages (PLC Alarms)
Messages enable you to recognize processing errors within the automation
systems, localize them exactly and remove them. This can considerably shorten
the down-times of a plant.
Before messages can be output, they need to be configured.
The message system in WinCC V12 SP1 enables the display and recording of
operating states and failures at a SIMATIC Panel, which are pending or occurring
in a plant.
The message system in WinCC V12 SP1 processes various alarm methods of the
controller and the SIMATIC Panel.
For the S7-300 CPUs only the control messages (PLC alarms) are used.
Control messages (PLC alarms) are configured in STEP 7. These event-related
messages are assigned to one respective block (FB). They are generated in the
program editor. In the message editor you assign message texts and message
attributes to the generated PLC alarms. Control messages (PLC alarms) are then
further edited in WinCC V12 SP1.
Note Detailed information on the configuration of control messages (PLC alarms) is
available in chapter
5.2 and in the STEP 7 V12 SP1 manual (see \3\ )
Detailed information on working with messages in WinCC V12 SP1 is available
in the WinCC V12 SP1 manual (see
\4\ ).