Siemens SIMATIC ET 200S - Diagnosis using the LEDs

Commissioning and Diagnostics
6-61
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
6.2.3 Diagnosis using the LEDs
Interface module
SF
BF
ON
Group error (red)
Bus error (red)
Power supply (green)
ET 200S
LINK
RX/TX
I/O controller not available (green)
Data exchange (yellow)
IM151-3 PN with open front door
The LINK and RX/TX LEDs are under the front door.
Figure 6-36 LED display on the IM151-3 PN interface module
Status and error displays with LEDs on IM151-3 PN
Table 6-28 Status and error displays of the IM151-3 PN
SF: red
BF: red
ON: green
LINK: green
RX/TX: yellow
SF
BF
ON
LINK
RX/TX
LEDs Meaning Remedy
SF BF ON
Off Off Off There is no voltage applied to the
interface module, or the interface
module has a hardware defect.
Switch on the 24 VDC supply voltage
at the interface module.
* * on There is voltage applied to the
interface module.
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