Status And Error Displays - Siemens CPU 410-5H Process Automation System Manual

3.3

Status and error displays

RUN and STOP LEDs
The RUN and STOP LEDs provide information about the currently active CPU operating
state.
LED
RUN STOP
Lit Dark
Dark Lit
Flashes Flashes
2 Hz 2 Hz
Flashes Lit
0.5 Hz
Flashes Lit
2 Hz
Dark Flashes
2 Hz
Dark Flashes
0.5 Hz
Flashes Flashes
0.5 Hz 0.5 Hz
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 RACK0
Lit Irrelevant
Irrelevant Lit
Irrelevant Dark
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
Meaning
The CPU is in RUN mode.
The CPU is in STOP mode. The user program is not being executed. Cold
restart/restart is possible. If the STOP status was triggered by an error, the error
indicator (INTF or EXTF) is also set.
The CPU has detected a serious error that is blocking startup. All other LEDs also
flash at 2 Hz.
HOLD status has been triggered by a test function.
A cold restart/restart was initiated. The cold restart/warm start 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, for example.
A high-quality RAM test (self-test) is executed after POWER ON. The self-test takes at
least 15 minutes.
Memory is being reset
The CPU requests a memory reset.
Troubleshooting mode
This display also indicates that internal processes are busy on the CPU and prevent
access to the CPU until completed. This status can be triggered by the following
routines:
Startup (POWER ON) of a CPU on which a large number of blocks is loaded. If
•
encrypted blocks are loaded, startup may take a longer time depending on the
number of such blocks.
Meaning
RACK1
Irrelevant CPU controls switched I/O
Dark CPU on rack number 0
Lit CPU on rack number 1
Structure of the CPU 410-5H
3.3 Status and error displays
37