Omron TJ1-MC04 - PROGRAMMING 1 Programming Manual page 240

Examples and tips
Parameter Pn202 is the electronic gear ratio denominator (G1).
Parameter Pn203 is the electronic gear ratio numerator (G2). The
servo motor rotates using the value of the position command signal
sent by the TJ1-MC__, multiplied by the electronic gear (Pn202,
Pn203). On the output (servo motor) side, the signal is expressed
in number of encoder pulses. For more information on Servo Driver
parameters Pn202 and Pn203, see the Sigma-II Servo Driver
manual.
The UNITS axis parameter effectively expresses the ratio between
user units that the user wants to use in the program and the
position sent to the Servo Driver via the MECHATROLINK-II bus.
Taking the electronic gear setting into account, the equation
expressing the relation between user units, the UNITS parameter,
parameters Pn202 and Pn203, encoder pulses and mechanical
measurement units is:
Pn202
.
UNITS =
Pn203
where y is the number of encoder counts and x is the amount in
user units.
PROGRAMMING MANUAL
y·encoder _ counts
x·user _ units
fig. 18
Trajexia
MOVE(x)
reference_units,
the minimum unit you can set
internally to the servo
driver
* UNITS
Servo Driver
encoder_counts, the
ultimate minimum distance
you can recognize and
depends on the encoder
Motor
*Pn202/Pn203
encoder
240