Siemens SIMATIC S7-1200

Technical specifications
A.12 Technology modules
S7-1200 Programmable controller
1496 System Manual, V4.2, 09/2016, A5E02486680-AK
A.12.1.4
Interrupt, error, and system alarms
LED display
Meaning of the LED displays
The following table explains the meaning of the status and error displays. You can find
remedial measures for diagnostic alarms in the "Diagnostic alarms" section.
LED DIAG
DIAG
Meaning
Off
Backplane bus supply of the S7-1200 not OK
Flashes
Module is not configured
On
Module parameterized and no module diagnostics
Flashes
Module parameterized and module diagnostics
OR
L+ power not connected