Siemens SIMATIC S7-300 - Manual (Page 63)

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SIMATIC S7-300 Getting Started for First Time Users
Getting Started, 04/2007, 6ZB5310-0NC02-0BA0
8.1 Diagnostics / correction of errors
Incorrect operation, faulty wiring, or an incorrect hardware configuration can
cause errors. The CPU 312C displays such errors with the group error LED SF
following a memory reset. For information on how to analyze errors and mes-
sages, refer to the “S7-300, CPU 31xC and CPU 31x: Installation” operating
instructions. This manual is included in the SIMATIC Manual Collection, which is
enclosed in the S7-300 starter kit.
The PC Adapter USB uses LEDs to indicate error states. To diagnose these
errors, refer to the electronic “PC Adapter USB” Manual. You can find this man-
ual on the installation CD for the PC Adapter USB.