Siemens SIMATIC MV550 S

Service and maintenance
10.1 Error and diagnostics messages
SIMATIC MV500
188 Operating Instructions, 05/2019, C79000-G8976-C494-02
LED
labeling
Meaning
Description and corrective measures
Red, flashing (frequency 1 s):
The function was canceled.
The function is not allowed/possible and has been can-
celed. The error is displayed for 5 s, the "READ" function is
then terminated.
Possible causes:
• The function is not allowed.
• The WBM is open.
• The reader is in processing mode.
• The settings under "Settings > Options > Extras > Oper-
ation on device" are wrong.
Yellow, flashing (frequency 0.5 s):
The function was canceled.
The function is not allowed and has been canceled. The
error is displayed for 5 s, the "READ" function is then termi-
nated.
Possible causes:
• A controller has control of the reader (DISA bit is set).
• The WBM is open.
10.1.8 IO device diagnostics
Errors, for example, "Error - transfer error PROFINET IO connection error", trigger I/O device
diagnostics. The diagnostic information is read out using STEP 7 depending on the I/O
controller.
How to read out I/O device diagnostic information and how it is structured is described briefly
below. You can find a detailed description in the programming manual "PROFINET IO –
From PROFIBUS DP to PROFINET IO".
10.1.8.1 Reading out the diagnostics information with STEP 7
If, for example, the error "Error - transfer error PROFINET IO connection error" occurs on the
optical reader and you are using an S7 controller as the I/O controller, the diagnostic
interrupt OB (OB82) is started on the I/O controller.
The local variables "OB_82_EV_CLASS", "OB_82_MDL_DEFECT" and "OB82_EXT_FAULT"
of the OB have the following values:
Table 10- 7 Tags of the diagnostic interrupt OB (OB 82) in the event of an error
Variable
Value
Meaning
OB_82_EV_CLASS
B#16#39
Event entering state
OB_82_MDL_DEFECT
TRUE
Module problem
OB_82_EXT_FAULT
TRUE
External problem
Unfortunately, you cannot identify the actual cause of the problem in the local variables of
OB82. You can determine this with PROFINET IO by calling SFB 54 "RALRM" in OB 82. The
entry "Faulty module" appears in the diagnostic buffer and the corresponding text from the