WCS* Read Head Position Encoding System
SSI Interface (LS3xx*)
2020-01
35
Bit 24 (DB output of a prewarning if the lenses are contaminated)
The contamination warning is transferred in bit 24 of the SSI protocol and can be evaluated.
The diagnostic bit DB is always switched on by default.
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.
Bit 25 (KB error message)
If the read head detects an error, the KB error bit is set and the error code is output to the con-
trol panel:
KB = 1
POS 2
0
... 2
2
= error number
POS 2
3
... 2
18
= 0
Information on the error messages see chapter 5.4.
Read head type
(* = 0 or 1)
S1
Diagnostic bit
1 2 3 4
WCS2B-LS31* X OFF X OFF ON
WCS2B-LS31* X OFF X ON OFF
WCS3B-LS31* X OFF X OFF ON
WCS3B-LS31* X OFF X ON OFF
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