Omron NX-EC0112, User Manual

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8 Pulse Output Units
NX-series Position Interface Units User’s Manual (W524)
8-
10 Fu
nct
ions
8
8-1
0-3 Output Mod
e Selection
The Pulse Output Unit has two pulse output selections.
Use the Output Mode Selection parameter to change the pulse output.
This method calculates the difference between the position output by the Controller each cycle and the
present position, automatically calculates the velocity required to distribute that difference, and then
outputs the pulses.
The pulse output interval depends on the control period, but because the number of pulses up to the
command position are output within a specific amount of time, the Unit is best used as a servo axis.
This method outputs pulses to maintain the specified velocity for the position and command velocity
from the Controller and prioritizes a continuous velocity.
This method outputs pulses to maintain the specified velocity. You can use it to prevent abrupt changes
in velocity due to changes in the control period.
Use this mode for constant velocity feed control or for stepper motors that can lose steps if there are
any sudden changes in the velocity.
Precautions for Correct Use
Error of ±0.005% occurs due to internal processing in the Unit between the set speed (fre-
quency) and the speed (frequency) that is actually output from the Unit. The error in the speed
does not affect positioning accuracy.
8-10-3 Output Mode Selection
Parameter name Setting Default Remarks
Output Mode Selec-
tion 0: Position-synchronous
pulse output
1: Velocity-continuous pulse
output 0 Changes are applied when the power sup-
ply to the NX Unit is turned ON or the NX
Unit is restarted.
Position-synchronous Pulse Output (for Servomotor Control)
Velocity-continuous Pulse Output (for Stepping Motor Control)
1 period
Difference = 4 Difference = 8 Difference = 16
The pulse speed is
calculated automatically.