Omron TJ2-MC64 - PROGRAMMING Programming Manual page 273

Examples and tips
Example 4
The mechanical system uses a servo motor with a 17-bit absolute encoder.
The mechanical gear ratio of the gearbox is 1:12.24. The mechanical
measurement units must be tenths of an angle degree. Therefore the total
repeat distance for the full turn of the moving part is 3600 tenths of an angle
degree.
With the same procedure as in example 1, we have:
17
.
Pn202 2 encoder_counts
UNITS =
.
Pn203 1 motor_revolution 1 machine_revolution
17
.
2 12.24 encoder_counts
=
3600 tenth of degree
Therefore:
UNITS =
One solution is:
UNITS = 2
Pn202 = 1224
Pn203 = 360000
Because the greatest common divisor of Pn202 and Pn203 must be 1, we
get: Pn202 = 17 and Pn203 = 500. Therefore, the parameters are:
To calculate the multiturn limit setting Pn205, we have:
. .
m motor_revolution = n machine_cycle = n 12.24 motor_revolution
PROGRAMMING MANUAL
. .
12.24 motor_revolution 1 pulley_revolution
.
3600 tenth of degree
Pn202 1224
17
= 2
Pn203 360000
17
= 131072
UNITS = 131072
Pn202 = 17
Pn203 = 500
Pn205 = 16
REP_DIST = 3600
REP_OPTION = 1
. .
M
=
17-bit absolute 1:12.24 Gear
encoder
fig. 22
Full turn = 360 =
3600 x tenth of degree
r
267