Operation
2
0
1
8
-0
9
19
Function Number for WCS Reader F0=1 (Send Diagnosis Result)
The WCS reader can be requested to perform a diagnosis of the photoelectrics by means of
the request byte. For this purpose, the WCS reader must be located outside of the code rail.
On the WCS2B and WCS3B readers, the pollution degree of the optical unit is monitored
automatically during operation and the diagnostic bit (DB) is set if pollution is too high. Thus the
specific request for diagnosis to the WCS reader via F0 in the request byte is no longer
necessary. For reasons of backward compatibility, this function is also supported by the new
WCS readers.
Diagnostic bit (DB)
The diagnostic bit (DB) indicates the result of the integrated diagnostics of the WCS reader.
DB
ERR
OUT Description
Optical state of
WCS reader
1
0
0
Diagnosis invalid, WCS reader not outside of the
code rail
-
1
0
1
Diagnosis result in P16...P18
P16...P18=0
Good
P16...P18>0
Poor
X
1
X
Error message from WCS reader, error message
binary coded in P00
P04
-