Chapter 8 Relevant Functions To Position; Current Position Change Function; Relevant Fbs - Mitsubishi Electric MELSEC iQ-R Series User Manual

8
RELEVANT FUNCTIONS to POSITION
8.1

Current Position Change Function

• This function executes control to change the set position to an arbitrary address. The current position change method
includes a method of changing the set position at control execution (MC_SetPosition) and a method of changing to the set
position corrected at the trigger input signal detection timing (MCv_SetPositionTriggered). (The feed machine position is
not changed.)
• The "absolute position set" and the "relative position set" can be specified in the address to change.
• A method of changing the set position at control execution can be performed even though the axis is in operation. However,
it cannot be performed during group control.
• A current position change to outside the ring counter range and outside the software stroke limit range cannot be executed.
• For operation when executing a current position change to the synchronous control master axis, refer to the following.
Page 426 SYNCHRONOUS CONTROL
When a current position change is completed, that "the current position change is executed" is recorded in the
event history.
Targets to be changed and corresponding FBs
Target to be changed
Position Current value
Limit value (Software stroke limit)
Limit value
(Software
stroke limit)
*1 Axis parameters can be changed by MC_WriteParameter. However, it cannot be changed during control.
*2 The maximum value of the limit value can not be changed.

Relevant FBs

MC_SetPosition
Item
Function overview
Symbol
[Structured Ladder]
Applicable hardware and
software (Language)
Number of input area points
(byte)
32
8 RELEVANT FUNCTIONS to POSITION
270
8.1 Current Position Change Function
Corresponding FB
MC_SetPosition
MCv_SetPositionTriggered
*1

*2

Maximum value of
the limit value
Description
Changes the current position of the specified axis (set position, actual position).
DUT : Axis
B : Execute
L : Position
B : Relative
W: ExecutionMode
UD : Options
RD78G(H) (Structured Text)
Number of output area points
(byte)
7
MC_SetPosition
Axis : DUT
CommandAborted : B
ErrorID : UW
CancelAccepted : B
Compiling method
Subroutine type
Done : B
Busy : B
Error : B
FB operation type
Real-time execution