Siemens SIMATIC S7-1200 - Page 1310

Online and diagnostic tools
15.1 Status LEDs
S7-1200 Programmable controller
1310 System Manual, V4.2, 09/2016, A5E02486680-AK
Table 15- 1 Status LEDs for a CPU
Description
STOP/RUN
Yellow / Green
ERROR
Red
MAINT
Yellow
Power is off
Off
Off
Off
Startup, self-test, or firmware
update
Flashing
(alternating yellow and green)
- Off
Stop mode
On (yellow)
-
-
Run mode On (green) - -
Remove the memory card
On (yellow)
-
Flashing
Error
On (either yellow or green)
Flashing
-
Maintenance requested
• Forced I/O
• Battery replacement re-
quired (if battery board in-
stalled)
On (either yellow or green) - On
Defective hardware
On (yellow)
On
Off
LED test or defective CPU
firmware
Flashing
(alternating yellow and green)
Flashing Flashing
Unknown or incompatible
version of CPU configuration
On (yellow) Flashing Flashing
Note
"Unknown or incompatible version of CPU configuration" error
Attempting to download an S7
-1200 V3.0 program to an S7-1200 V4.0 CPU causes a CPU
error, and the CPU displays a corresponding error message in the diagnostic buffer. If you
reached this state by using a
n invalid version program transfer card (Page 142), then
remove the card, perform a STOP to RUN transition, a memory reset (MRES) or cycle
power. I
f you reach this state by an invalid program download, reset the CPU to factory
settings
(Page 1317). After you recover the CPU from the error condition, you can download
a valid V4.0 CPU program.
The CPU also provides two LEDs that indicate the status of the PROFINET communications.
Open the bottom terminal block cover to view the PROFINET LEDs.
● Link (green) turns on to indicate a successful connection
● Rx/Tx (yellow) turns on to indicate transmission activity
The CPU and each digital signal module (SM) provide an I/O Channel LED for each of the
digital inputs and outputs. The I/O Channel (green) turns on or off to indicate the state of the
individual input or output.