Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 52

Unit Setting
Setting method: High Speed I/O Parameter
Set the unit system (user unit) to be used for the positioning function.
The selected unit system is applied to the speed used for positioning instructions and operands of positioning-related special
devices and positioning instructions (command speed, positioning address) as a unit. The unit types of the positioning control
include the motor system unit, machine system unit, and multiple system unit.
Unit system Item
Motor System [0: Motor System (pulse, pps)]
Machine System [1: Machine System (μm, cm/min)]
[2: Machine System (0.0001 inch, inch/min)]
[3: Machine System (mdeg, 10 deg/min)]
Multiple System [4: Multiple System (μm, pps)]
[5: Multiple system (0.0001 inch, pps)]
[6: Multiple system (mdeg, pps)]
The following indicates the relation between the motor system unit and machine system unit.
• Transfer distance (pulse) = Transfer distance (μm, 10
magnification ÷ Transfer distance per rotation
• Speed command (pps) = Speed command (cm/min, inch/min, 10 deg/min) × No. of pulses per rotation × 10
distance per rotation ÷ 60
Precautions
■Command error when the machine system unit or multiple system unit is used:
Under the condition of the number of pulses per rotation = A, transfer distance per rotation = B, and relative transfer distance
= C, the number of pulses that the CPU module should output is calculated from "C × (A/B)". Even if the result of (A/B) is not
an integer, no calculation error occurs as long as the result of C × (A/B) is an integer. However, if the result of C × (A/B) is not
an integer, a rounding error within one pulse occurs.
For positioning operations using absolute address, a rounding error within one pulse may occur. For positioning operations
using relative address, errors may accumulate in the current address.
■The position unit when the machine system unit or multiple system unit is used:
When the machine system or multiple system is set as the unit system, the number of pulses and transfer distance per
rotation must be set. When the machine system or multiple system is set, the position unit is handled as the machine system
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unit of μm, 1.0E inch or mdeg. The unit can be selected from μm, 10
that other positioning address and command speed all have the same unit, and then the same pulse output can be acquired
as long as the setting value is the same even with different units. The following is a setting example.
Ex.
Setting example of control unit
Condition
Setting item
Pulse No. of per Rotation
Movement Amount per Rotation
Position Data Magnification
Electronic gear of servo amplifier
(Setting of servo amplifier)
4 POSITIONING PARAMETER
50
4.2 Details of Parameters
Position unit Speed unit Remarks
pulse pps
μm
cm/min
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10 inch inch/min
mdeg 10 deg/min
μm
pps
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10 inch
mdeg
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inch, mdeg) × No. of pulses per rotation × Positioning data
Setting value
4000 [pulse/REV]
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100 [μm/REV,10 inch/REV, mdeg/REV]
× Single
1/1
Based on the number of pulses for position commands
and speed commands.
Based on position commands and μm, 10
mdeg of speed.
Uses the machine system unit for position commands
and motor system unit for speed command.
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inch, and mdeg in the unit setting. However, consider
Remarks


The transfer distance is handled in μm, 10
mdeg.

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inch and
4
÷ Transfer
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inch or