2
0
2
0
-0
3
26
Communication with WCS Read Heads
Diagnostic bit (DB)
Diagnostic bit DB displays the result of the integrated diagnostics of the read head.
Contamination detection
Read heads WCS2B and WCS3B continually monitor the condition of the lenses. If a drop in
light output is detected on the infrared transmitter, e.g., as a result of contamination of the clear
protective lenses, the read head automatically increases the light intensity. If the level of con-
tamination is too high, a warning message is sent to the higher-level control panel (diagnostic
bit DB=1). The automatic light adjustment in the read head allows you sufficient time to clean
the read head as part of the next servicing procedure. The WCS3B read head emits a visual
signal for the "contamination detected" state: the yellow and red LEDs on the front of the read
head flash alternately. To clean the lenses, the read head must be removed from the code rail
(removed from the mounting base). After cleaning the transparent protective lenses, the con-
tamination message is automatically deleted from the read head. If the message is not reset
despite careful cleaning or replacement of the plastic protective lenses, there may be an error.
In this case, the read head must be sent for inspection.
Function number for read head F0 = 1 (send diagnosis result)
ERR
DB
OUT
Description
State of the read
head lens
0
1
0
Diagnosis invalid, read head not outside
of the code rail
-
0
1
1
Diagnosis result in P16 ... P18
-
P16 ... P18 = 0
Good
P16 ... P18 > 0
Poor
1
x
x
Error message from read head, error
message in P00 ... P04, binary coded
-
