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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
11-7
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Diagnostics with LEDs is an initial tool for error localization. Usually you evaluate
the diagnostic buffer for further error localization.
The buffer contains plain text information on the error that has occurred. For
example, the number of the appropriate error OB is located there. If you generate
this information, you can prevent the CPU from switching to STOP mode.
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see the 6WDWXVDQGHUURUGLVSOD\V section of the appropriate &38'DWDReference
Manual.
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Table 11-2 Status and error displays
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6723
LED
off
LED
off
LED
off
LED off LED off CPU power supply missing.
Remedy:
Check whether the power supply module is connected to
mains and switched on.
Check whether the CPU is connected to the power supply
module and switched on.
LED
off
On X (see
the
descri
ption)
LED off On The CPU is in STOP mode.
Remedy: Start the CPU.
On On X LED off On The CPU is in STOP mode as a result of error.
Remedy: refer to the tables below, evaluate the SF LED
X On X LED off Flashes
(0.5 Hz)
The CPU requests memory reset.
X On X LED off Flashes
(2 Hz)
The CPU executes memory reset.
X On X Flashes
(2 Hz)
On The CPU is in start-up mode.
X On X Flashes
(0.5 Hz)
On The CPU was halted by a programmed break point.
For details refer to the Programming Manual 3URJUDPPLQJ
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On On X X X Hardware or software error
Remedy: refer to the tables below, evaluate the SF LED
X X On X X You have activated the Force function
For details refer to the Programming Manual 3URJUDPPLQJ
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This status has no effect on the current CPU function.
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