Overview
1.2 Design of the device
SIMATIC IPC427E
14
Operating Instructions, 09/2017, A5E37454814-AB
1.2.2
Status displays
LED
State
Description
PC ON/WD
Off
-
Green
BIOS ready to boot; PC running
Flashing green/yellow
(1 Hz)
BIOS in POST, power switch on
Yellow
Idle state
Flashing red (1 Hz)
Watchdog status display: active
RUN/STOP / L1
Off
-
Green
Can be controlled by user program
Yellow
Can be controlled by controller program (e.g.
WinAC)
ERROR / L2
Off
-
Red
-
Flashing red
Can be controlled by user program or controller
program (e.g. WinAC)
MAINT / L3
Off
-
Yellow
-
Red
Can be controlled by controller program (e.g.
WinAC)
For additional information on controlling the LEDs or the NVRAM with a Windows operating
system, please refer to Output register user LED L1/L2/L3 (read/write, address 404Eh)
(Page 122). Example programs for controlling the LEDs on Windows operating systems are
available on the Customer Support page of Siemens Industry Automation and Drive
Technologies. (