Status And Error Leds On The C7 - Siemens simatic c7-621 Hardware Installation Manual

2.11 Status and Error LEDs on the C7

Status and Error
The C7-621 or C7-621 AS-i has the following status and error LEDs:
LEDs
Figure 2-19
Meaning of the
The status and error LEDs are explained in the order in which they appear on
Status and Error
the C7.
LEDs
LED Meaning
SF (red) C7 CPU group error
DC5V (green) 5V DC power supply
for the C7
FRCE (yellow) Reserved
RUN (green) RUN or RUNP mode
on the C7 CPU
STOP (yellow) STOP mode on the
C7 CPU
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01
SF DC5V
FRCE
Status and Error LEDs of the C7-621 or C7-621 AS-i
Explanation
Lights up in the following situations:
Hardware faults
Firmware errors
Programming errors
Parameter assignment errors
Math errors
Time errors
Defective internal memory
I/O fault/error in the internal I/O functions
To find out the exact cause of the problem read out the
diagnostic buffer using a programming device..
Lights up when the internal 5V DC power supply is functioning
correctly.
-
Lights up when the C7 is executing the user program.
Flashes (several times) during the C7 startup. After the STOP LED goes
off, the outputs are enabled.
Lights up when the C7 is not executing the user program.
Flashes at 1 second intervals when a memory reset has been requested by
the operator or by the C7 CPU.
Flashes twice; refer to installation.
Installing and Preparing the C7
RUN
STOP
2-23