Diagnostics With Leds - Siemens CPU 313C Hardware And Installation Manual

 'LDJQRVWLFV ZLWK /('V
,QWURGXFWLRQ
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.
)RU IXUWKHU LQIRUPDWLRQ RQ VWDWXV DQG HUURU GLVSOD\V
see the 6WDWXV DQG HUURU GLVSOD\V section of the appropriate &38 'DWD Reference
Manual.
6WDWXV DQG HUURU GLVSOD\V RI DOO &38V
Table 11-2 Status and error displays
/('
6)  9'& )5&(
LED LED LED
off off off
LED On X (see
off the
descri
ption)
On On X
X On X
X On X
X On X
X On X
On On X
X X On
'HVFULSWLRQ RI VWDWXV ;
This status has no effect on the current CPU function.
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
7HVWLQJ )XQFWLRQV 'LDJQRVWLFV DQG )DXOW (OLPLQDWLRQ
581 6723
PRGH
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 The CPU is in STOP mode.
Remedy: Start the CPU.
LED off On The CPU is in STOP mode as a result of error.
Remedy: refer to the tables below, evaluate the SF LED
LED off Flashes The CPU requests memory reset.
(0.5 Hz)
LED off Flashes The CPU executes memory reset.
(2 Hz)
Flashes On The CPU is in start-up mode.
(2 Hz)
Flashes On The CPU was halted by a programmed break point.
(0.5 Hz)
For details refer to the Programming Manual 3URJUDPPLQJ
ZLWK 67(3  .
X X Hardware or software error
Remedy: refer to the tables below, evaluate the SF LED
X X You have activated the Force function
For details refer to the Programming Manual 3URJUDPPLQJ
ZLWK 67(3  .
'HVFULSWLRQ
11-7