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JWST499-c06
JWST499-Cetinkunt
SENSORS 347 254mm×178mm
2 0
2 1
2 2
2 3
15
14 1
0
13 2
12 3
11 4
shaft
10 5
9 6
8 7
Rotary incremental Rotary absolute
encoder disc encoder disc
A/B Bit4 (MSB)
Index bit2
bit1
Bit0 (LSB)
Linear incremental Linear absolute
encoder scale encoder scale
1
Bit3
1 0
A 1
0 Bit2
1 0
B 1
0 Bit1
1 0
Index 1
0 Bit0 0
FIGURE 6.18: Disks of incremental (rotary and linear) and absolute encoders and the typical
encoder output signals.
Fixed board with slits
LED Slit Slit of Slit of phase B
phase A
A
B Light-
receiving
device
Z
Slit of phase Z
Rotary disk
FIGURE 6.19: Components and operating principle of a rotary incremental encoder: rotary
disk with slits, LEDs, phototransistors (light receiving devices) mask.
