Siemens S7-1200 - Page 825

SM 1278 4xIO-Link Master
15.4 Interrupt, error, and system alarms
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
825
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
LED port status
Valid for IO-Link port which is in IO-Link port mode.
COM/1 ... COM/4
Meaning
Off
Port deactivated
Flashes
Port activated, device not connected or
Port is not connected to the configured device
On
Port activated, device connected
LED channel status
Valid for IO-Link port which is in DI/Q mode.
DI/Q1 ... DI/Q4
Meaning
Off
Process signal = 0
On
Process signal = 1