Service and maintenance
10.1 Error and diagnostics messages
SIMATIC MV500
Operating Instructions, 05/2019, C79000-G8976-C494-02
187
10.1.7 Diagnostics during the "READ" function
The following table shows possible errors displayed by the "READ" LED during execution of
the "READ" function.
Table 10- 6 Display of operating states
Description and corrective measures
Green flashing:
The "READ" function is bring executed.
The "READ" function is currently running and the reader is
going through the steps of automatic adaptation.
Red, flashing (frequency 0.5 s):
The "READ" function setting was not suc-
cessful.
The "READ" function was not successful. The error is dis-
played for 5 s, the "READ" function is then terminated.
Possible cause:
• The lighting conditions are not sufficient for an automatic
adjustment.
• (b) The object to be read does not have sufficient con-
trast to adjust the focus (EF lens).
• (c) The code to be read is not fully in the image.
• (d) The code to be read is neither of the "DMC" type nor
a 1D barcode and the "Fast code type detection" pa-
rameter is enabled.
• (e) The source program has unsuitable settings for the
code to be read - e.g. the number of decoder steps,
their ROI or the number of codes to be read.
Solutions:
• (a) Make sure you have suitable lighting.
• (a) Use a built-in ring light with polarization filter to re-
duce reflections.
• (b) Make sure that there is an object with sufficient con-
trast in the field of view of the reader, that the object is
sufficiently far away from the reader (at least 30 - 60 cm
depending on the lens) and that the object is sufficiently
illuminated.
• (c) Ensure that the code is located completely in the
reader's ROI.
• (d) Disable the parameter "Fast code type detection".
• (e) Change the source program or select another source
program in the options.
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