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WCS-PG410
Communication with WCS read heads
Behavior of the read head in the area of the WCS3 code rail extender
(WCS3-CS70-E)
The read head retains the last measured end position of the first code rail segment (position =
393203) when traversing the WCS3 code rail extender. The OVL bit is set at the same time. As
soon as the first valid position of the second code rail segment is read, the read head switches
to the first valid position of the second code rail segment (position = 393318). The first valid
position of the second code rail segment is dimensioned with an offset of approx. + 92 mm
(see area highlighted in yellow in the figure below).
Caution!
Impermissible state
If you mount the WCS3 code rail extender in the wrong position, e.g., at an intermediate posi-
tion of the code rail, the OUT bit is set when this code rail segment is crossed.
Note
Cycle time
Note that the cycle time for the extended variant differs from the standard variant by t = 10 ms.
Start-up behavior of the read head
After the supply voltage has been connected, the X position is set to the last valid X position
and the VAL bit is set to 1.
The speed value is 127 and the SST bit is set to 1.
After the read head moves by approx. 5 mm, the VAL bit is set to 0 and the X position is
assigned a new calculated X position. The last valid X position is stored in a non-volatile mem-
ory if it is detected that the voltage is switched off (+Ub < 9.9 VDC).
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