Technical specifications
A.12 Technology modules
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
1496
DIAG
Meaning
Backplane bus supply of the S7-1200 not OK
Off
Module is not configured
Flashes
Module parameterized and no module diagnostics
On
Module parameterized and module diagnostics
OR
Flashes
L+ power not connected
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK