Set Position - Mitsubishi Electric MELSEC iQ-R Series User Manual

Set position

AxisName.Md.SetPosition can be set to an arbitrary ring address by setting AxisName.PrConst.RingCount_UpperValue and
AxisName.PrConst.RingCount_LowerValue. The ring counter upper/lower limit value can be set within the range of -
10000000000.0 to 10000000000.0.
Restrictions
The motion control function uses the real number data (floating-point data) for the axis current position and the command
target position, etc. Therefore, it may include the truncation error.
Ex.
When the positioning of relative position specification such as MC_MoveRelative is executed repeatedly, it may cumulative
the truncation error between the command current position and the specified movement value.
If the truncation error is a problem, execute the positioning of absolute position specification such as MC_MoveAbsolute.
Besides, the truncation error occurred by the real number data processing internal the function can be suppressed to set the
number without after the decimal point to the real number type parameter related to the motion control function.
Ex.
When the truncation error is a problem in the following setting (A), the setting (B) becomes a change candidate.
• Setting (A)
Setting item
*1
Position command unit
Ring counter upper value
Ring counter lower value
The minimum scale of the target position/movement amount
specified by FB input
• Setting (B)
Setting item
*1
Position command unit
Ring counter upper value
Ring counter lower value
The minimum scale of the target position/movement amount
specified by FB input
*1 For details of the setting method, refer to the following.
Page 62 Technical Units
2 AXIS MANAGEMENT FUNCTIONS
68
2.2 Positioning Range
Setting detail
[mm]
100.3 [mm]
-100.7 [mm]
0.05 [mm]
Setting detail
[m]
10300 [m]
-10700 [m]
50 [m]