Io Device Diagnostics; Reading Out The Diagnostics Information With Step 7 - Siemens SIMATIC MV500 Operating Instructions Manual

Service and maintenance
10.1 Error and diagnostics messages
LED Meaning
labeling
Red, flashing (frequency 1 s):
The function was canceled.
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
Variable
OB_82_EV_CLASS
OB_82_MDL_DEFECT
OB_82_EXT_FAULT
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
GSD file, for example, "Error - transfer error PROFINET IO" appears in the module information
of the optical reader.
When the error has been corrected and you have acknowledged this in the WBM of the
optical reader, the diagnostics interrupt OB (OB 82) is restarted on the I/O controller.
236
Tags of the diagnostic interrupt OB (OB 82) in the event of an error
Value
B#16#39
TRUE
TRUE
Description and corrective measures
The function is not allowed/possible and has been canceled.
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 > Opera-
tion on device" are wrong.
• A controller has control of the reader (DISA bit is set).
• The WBM is open.
Meaning
Event entering state
Module problem
External problem
Operating Instructions, 03/2021, C79000-G8976-C494-05
SIMATIC MV500