Overview
1.2 Structure of the devices
SIMATIC IPC227G
12
Operating Instructions, 06/2021, A5E50059933-AA
1.2.3
Status displays
LED
State
Description
PC ON/WD
Off
-
Green
BIOS ready to boot
Flashing green/yellow (1 Hz) BIOS in POST, power switch on
Orange
During the S4/S5 state
Flashing red (1 Hz)
Watchdog status display: active
RUN/STOP / L1
Off
-
Green
Can be controlled by user program/control
program (e.g. software controller)
Red
Orange
ERROR / L2
Off
-
Red
Can be controlled by user program/control
program (e.g. software controller)
Green
Orange
MAINT / L3
Off
-
Orange
Can be controlled by user program/control
program (e.g. software controller)
Green
Red
You can find information on the individual LEDs in the section Control register user LED
L1/L2/L3 (Page 81). Example programs for controlling the LEDs on Windows operating
systems are available on the Customer Support page of Siemens Industry Automation and
Drive Technologies. (