Mitsubishi Electric MELSEC iQ-R RD78G4 - Page 68

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2 INPUT AXIS MODULE
2.3 Synchronous Encoder Axis
[Pr.324] Synchronous encoder axis length per cycle
Set the length per cycle for the synchronous encoder axis position value per cycle.
The position value of synchronous encoder axis is stored in "[Md.321] Synchronous encoder axis position value per cycle" at
ring counter based on the setting value.
The unit settings are in synchronous encoder axis position units (Page 56 Synchronous encoder axis position units).
Set a value within the range from 1 to 2147483647.
■Setting example of the unit conversion and the length per cycle
The following shows an example a rotary encoder is connected which resolution is 4000[pulse/rev] to the motor axis side on
the rotation table that drives by 1/5 pulley system, and the control unit is degree.
• Position unit: 0.1[degree]
• Speed unit: 0.001[degree/min]
• Length per cycle: 360.0[degree] (1 cycle of the rotation table)
Setting item Setting details Setting value
[Pr.321]
Synchronous encoder axis unit
setting
Control unit 2: degree 3112H
Number of decimal places for position 1
Speed time unit 1: minute[min]
Number of decimal places for speed 3
[Pr.322] Synchronous encoder axis unit conversion: Numerator 360.0[degree]  1 3600[0.1 degree]
[Pr.323] Synchronous encoder axis unit conversion: Denominator 4000[pulse]  5 20000[pulse]
[Pr.324] Synchronous encoder axis length per cycle 360.0[degree] 3600[0.1 degree]
[Md.322] Synchronous
encoder axis speed
(Speed after unit
conversion)
[Md.321] Synchronous
encoder axis position
value per cycle
[Md.320] Synchronous
encoder axis
position value
Synchronous encoder
input pulse
[Pr.322], [Pr.323]
Synchronous encoder
axis Unit conversion
[Pr.324] Synchronous encoder axis length per cycle
t
[pulse]
20000
40000
t
[ × 0.1degree]
7200
3600
t
3600
[ × 0.1degree]
t
[ × 0.001degree/min]