Omron TJ1-MC04 - PROGRAMMING 1 Programming Manual page 249

Examples and tips
Example 5
The mechanical system uses a servo motor with a 17-bit absolute
encoder. The mechanical gear ratio of the gearbox is 1:10. The
pulley has got 12 teeth, and each two are 50 mm apart. One
complete turn of the pulley equals 144 stations on the main wheel.
The distance between two stations is 50 mm. The mechanical
measurement units must mm. Total repeat distance must be the
distance between two stations, 50mm.
With the same procedure as in example 1, we have:
Pn202
UNITS =
Pn203
17
. .
2 encoder_counts 10 motor_revolution
.
. .
1 motor_revolution 1 pulley_revolution
17
.
2 10 encoder_counts
=
.
12 50 mm
Therefore, if we use the mechanical system to set the electronic
gear ratio, we have:
Pn202
UNITS
Pn203
One possible solution is:
UNITS =
Pn202 = 5
Pn203 = 6
Pn205 = 4
17
Because 2 /50 is a number with an infinite number of decimal
digits, we can choose the following:
Pn202
10
17
= 2 = 2
UNITS
.
Pn203 50 12
PROGRAMMING MANUAL
. .
1 pulley_revolution 1 station
.
=
.
12 station 50mm
17
2 10
=
50 12
17
2
50
10 1 1 1
17 17 17 15
= 2 = 2 = 2
2
.
600 60 2 15 15
M
17-bit absolute 1:10 Gear
encoder
Pulley: 12 teeth
50mm between teeth
fig. 23
Main Wheel: 144 stations
50 mm between stations
249