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
10-16 Operating Instructions, Edition 08/2004, A5E00105492-05
10.6.6 Status displays: CPUs with PN Interface
Status and Error Indicators: PROFINET devices
Note
The RX and TX LEDs can be combined in one LED, same as on CPU 317-2 DP/PN or CP
343-1 The LED on this device is located, for example, behind the front cover.
LED status Description of the status LED
Not lit Flashes Lit
- - X The Ethernet connection between the PROFINET
interface X2 of your PROFINET device and a
communication partner is up (for example, a switch).
- X - Only with an IO device:
The user activated flashing from STEP 7.
LINK
X - - The Ethernet connection between the PROFINET
interface of the PROFINET device and the
communication partner is down.
- - X
(flickers)
At the current time, data are being received from a
communication partner on Ethernet via PROFINET
interface of the PROFINET device.
RX
X - - No data are currently received via the PROFINET
interface.
- - X
(flickers)
Data are currently sent to a communication partner on
Ethernet via the PROFINET interface of the PROFINET
device.
TX
X - - No data are currently transmitted via the PROFINET
interface.
- - X Error on the PROFINET interface, communication no
longer possible (for example, with a CPU as IO
controller, when the connection to the switch is down)
To correct or avoid error: See the table below
- X - Error on the PROFINET interface (for example, due to
station failure of one or more IO devices)
To correct or avoid error: See the table below
BF2 or
BUSF
X - - No error at the PROFINET interface

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)