8 CONTROL SUB FUNCTIONS
8.9 Other Functions
295
8
Precautions during control
• The deceleration start flag function is valid for the control method of "1-axis linear control", "2-axis linear interpolation
control", "3-axis linear interpolation control", "4-axis linear interpolation control", "speed-position switching control" or
"position-speed switching control". In the case of linear interpolation control, the function is valid for only the reference axis.
(MELSEC iQ-R Simple Motion Module User's Manual (Startup))
• The deceleration start flag does not turn ON when the operation pattern is "continuous positioning control" or "continuous
path control".
• The deceleration start flag function is invalid for a home position return, JOG operation, inching operation, manual pulse
generator operation, speed-torque control and deceleration made with a stop signal.
• The deceleration start flag does not turn ON when a speed change or override is used to make deceleration.
• If a target position change is made while the deceleration start flag is ON, the deceleration start flag remains ON.
• When the movement direction is reversed by a target position change, the deceleration start flag turns ON.
• During position control of position-speed switching control, the deceleration start flag is turned ON by automatic
deceleration. The deceleration start flag remains ON if position control is switched to speed control by the position-speed
switching signal after the deceleration start flag has turned ON.
• If the condition start of a block start is not made since the condition is not satisfied, the deceleration start flag turns ON
when the shape is "End".
• When an interrupt request during continuous operation is issued, the deceleration start flag turns ON at a start of
deceleration in the positioning data being executed.
Setting method
To use the "deceleration start flag function", set "1" to the following control data using a program.
The set data is made valid on the rising edge (OFF to ON) of the PLC READY signal [Y0].
Refer to the following for the setting details.
Page 504 Control Data
Setting item Setting value Setting details Buffer memory address
[Cd.41] Deceleration start flag valid Set whether the deceleration start flag function is made valid or
invalid.
0: Deceleration start flag invalid
1: Deceleration start flag valid
5905
Time
Operation pattern: Positioning complete (00)
[Md.48] Deceleration start flag
01
Deceleration start point
Execution of target position change request
Time
Operation pattern: Positioning complete (00)
[Md.48] Deceleration start flag
01
Execution of target position change request
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