Siemens Simatic S7-300 CPU 31xC Series User Manual

Debugging functions, diagnostics and troubleshooting
10.6 Diagnostics using status and error LEDs
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
10-9
Further Information
At the Web address "www.profibus.com", you will find information on SNMP in the Network
Management standardization group.
At the Web address "www.snmp.org", you will find further details on SNMP.
At the Web address "www.siemens.com/snmp-opc-server", you will find further information
on the SNMP OPC server.
10.6 Diagnostics using status and error LEDs
10.6.1 Introduction
Diagnostics with LEDs is an initial tool for error localization. Usually, you evaluate the
diagnostic buffer for further error localization.
The buffer contains plain text information on the error that has occurred. For example, you
will find the number of the appropriate error OB here. If you generate this error OB, you can
prevent the CPU from going into STOP mode.

Siemens Simatic S7-300 CPU 31xC Series Specifications

General

Series	S7-300 CPU 31xC
Power Supply	24 V DC
Communication Interfaces	MPI, PROFIBUS DP
Programming Languages	LAD, STL, FBD, SCL
Operating Temperature	0°C to +60°C
Memory	48 KB - 512 KB
Dimensions	40 x 125 x 130 mm (varies by model)