Status And Error Displays - Siemens SIMATIC S7-400H System Manual

Installation of a CPU 41x–H

5.3 Status and error displays

5.3 Status and error displays
RUN and STOP LEDs
The RUN and STOP LEDs provide information about the active CPU operating status.
LED
RUN
H
D
B
2 Hz
B
0.5 Hz
B
2 Hz
D
x
B
0.5 Hz
D = LED unlit; H = LED lit; B = LED flashing at specified frequency; x = LED status is irrelevant
MSTR, RACK0 and RACK1 LEDs
The three LEDs, MSTR, RACK0 and RACK1 provide information about the rack number set
on the CPU and show which CPU controls the switched I/O.
LED
MSTR
H
x
x
D = LED unlit; H = LED lit; x = LED status is irrelevant
46
Meaning
STOP
D CPU is in RUN mode.
H CPU is in STOP mode. The user program is not executed. Cold restart/warm
restart is possible. If the STOP status was triggered by an error, the error indicator
(INTF or EXTF) is also set.
B CPU is DEFECTIVE. All other LEDs also flash at 2 Hz.
2 Hz
H HOLD status has been triggered by a test function.
H A cold restart / warm restart was initiated. The cold/warm restart may take a
minute or longer, depending on the length of the called OB. If the CPU still does
not change to RUN, there might be an error in the system configuration.
B Self-test with unbuffered POWER ON is busy. The self-test may take up to
10 minutes
2 Hz
CPU memory reset is busy
B The CPU requests a memory reset.
0.5 Hz
B Troubleshooting mode
0.5 Hz
Meaning
RACK0 RACK1
x x CPU controls switched I/O
H D CPU on rack number 0
D H CPU on rack number 1
System Manual, 09/2007, A5E00267695-03
S7-400H