Functions Related To Start; Pre-Reading Start Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

8.5
A function related to start includes the "pre-reading start function". This function is executed by parameter setting or program
creation and writing.

Pre-reading start function

The "pre-reading start function" does not start servo while the execution prohibition flag is ON if a positioning start request is
given with the execution prohibition flag ON, and starts servo within operation cycle after OFF of the execution prohibition flag
is detected. The positioning start request is given when the axis is in a standby status, and the execution prohibition flag is
turned OFF at the axis operating timing.
Controls
The pre-reading start function is performed by turning ON the positioning start signal with the execution prohibition flag
([Cd.183]) ON. However, if positioning is started with the execution prohibition flag ON, the positioning data is analyzed but
servo start is not provided. While the execution prohibition flag is ON, "[Md.26] Axis operation status" remains unchanged
from "5: Analyzing". The servo starts within operation cycle after the execution prohibition flag has turned OFF, and "[Md.26]
Axis operation status" changes to the status (e.g. position control, speed control) that matches the control method. Turn OFF
the execution prohibition flag after "2: Completed" is set to "[Md.503] Pre-reading data analysis status". (Refer to the following
figure.)
■4-axis module operation example
Positioning control
[Cd.183] Execution
prohibition flag
Positioning start signal
[Y10, Y11, Y12, Y13]
BUSY signal
[X10, X11, X12, X13]
[Md.503] Pre-reading
data analysis
status
[Md.26] Axis operation
status
8 CONTROL SUB FUNCTIONS
270

8.5 Functions Related to Start

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Functions Related to Start
V
Standby
Standby
search engine
Ta
Analyzing Completed
Analyzing
Positioning Execution prohibition flag
data analysis OFF waiting
Within operation cycle
Standby
Position control
t