Balluff BML-S Series, User Manual, Page: 41 / 130

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6
Interface (continued)
1.1.2 Circuitry for reference position
Depending on the type, the sensor transfers the following
signals:
– No reference signal
– Single, double, or fixed-periodic reference signal that is
magnetically coded in the magnetic tape
– A pole-periodic reference signal (periods = 5 mm,
reference signal width = edge distance, Figure 6-1). If
several reference signals must be transferred, an
external selection switch must be mounted at the
desired reference point signal.
Reference signals from the limit switch range
may not be evaluated.
Fig. 6-5:
External selection
switch
Sensor head PLC
Reference signal
for the controller
Reference position circuitry
1.1.3 Circuitry for front and rear limit switch
magnets
The permanent magnets with different poles at the end of
the measuring range are each sensed by a limit switch
sensor.
The sensors work as normally closed contacts, allowing
you to monitor cable breaks.
Fig. 6-6:
U
B
R0 R1
PLC
FLS
RLS
GND
Front limit switch
magnets
Rear limit switch
magnets
Limit switch circuitry, R0 = R1 = pull-up resistance
(e.g. 1 k)
Fig. 6-7:
Front limit switch magnets
Rear limit switch magnets
Limit switch magnet signals
BML-S _ B/C/E0-Q _ _ _ -M4 _ _ - _ 0-KA _ _ /KA _ _-S284
Incremental Magnetic Linear Encoder
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