Siemens SIMATIC ET 200SP Manual page 16

Interrupt, error and system messages
5.1 Status and error displays
PWR LED
Table 5- 1
DIAG LED
Table 5- 2
LED channel status
Table 5- 3
Channel status
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Meaning of the PWR LED
PWR Meaning
Supply voltage L+ missing
Off
Supply voltage L+ present
On
Meaning of the DIAG LED
DIAG Meaning
Backplane bus supply of the ET 200SP not OK
Off
Module is not configured
Flashing
Module configured and no module diagnostics
On
Module configured and module diagnostics
Flashing
Meaning of LED channel status
Meaning
Process signal = 0
Off
Process signal = 1
On
DI 8x24VDC ST digital input module (6ES7131-6BF00-0BA0)
Manual, 03/2012, A5E03574157-01