Siemens SIMATIC S7-300 - Manual (Page 45)

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SIMATIC S7-300 Getting Started for First Time Users
Getting Started, 04/2007, 6ZB5310-0NC02-0BA0
4.4 Establishing the online connection between the
PC and CPU 312C
You must establish an online connection between the PC and CPU 312C for the
following:
• Downloading and testing the control programs
• Displaying and changing the operating state of the CPU 312C
• Displaying the module status
• Hardware diagnostics
To establish an online connection, you must connect the PC and CPU 312C to
one another via the MPI interface.
Establishing the online connection
STEP 7 Lite attempts to establish the online connection on startup.
If the connection exists, the operating state of the CPU 312C is displayed in the
status bar as “STOP”.
If no connection exists, the status bar displays “Disconnected”.
1. If the connection does not exist, establish the connection between the
CPU 312C and your PC.