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6 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL
6.5.6 Stop program
The axis stop signal [Y13, Y14, Y1C] or a stop signal from an external source is used
to stop the control. Create a program to turn the axis stop signal [Y13, Y14, Y1C] ON
as the stop program.
The process for stopping control is explained below.
Each control is stopped in the following cases.
(a) When each control is completed normally.
(b) When the drive unit READY signal is turned OFF.
(c) When the PLC READY signal is turned OFF (When "parameter error' or "watch
(d) When an error occurs.
(e) When control is intentionally stopped (Stop signal from PLC CPU turned ON, stop
The stop process for the above cases is shown below. (Excluding (a) when the
operation stops normally.)
(1) Stop process
Stop cause
unit
Drive
Forced stop
signal OFF
Fatal stop
Hardware stroke
(Stop group 1)
limit signal ON
Software stroke
limit upper/lower
limit error
Emergency
occurrence
stop
Sequence READY
(Stop group 2)
signal OFF
"Stop" input from
external device
Axis error
detection (Error
Relatively safe
other than stop
stop
group 1 or 2)
(Stop group 3)
Error in test mode
"Stop signal" ON
from external
source
Intentional stop
(Stop group 3) "Axis stop signal"
ON from PLC
CPU
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dog timer error" occurs in PLC CPU.)
from peripheral device, etc.)
Axis
operation
status
Stop
(
M d .3 5
)
axis
after
stopping
Each
During
READY
axis
error
Each
During
axis
error
Each
axis
During
error
All
axes
Each
During
axis
error
When
Each
stopped
axis
(While
waiting)
Stop process
Zero point return
control
High-
Main
Machine
speed
positioning
zero point
zero
control
return
point
control
return
control
Immediate stop
Deceleration stop/sudden stop
Pr.38
(Select with
Deceleration stop/sudden stop
Pr.39
(Select with
Deceleration stop/sudden stop
Pr.40
(Select with
6 - 36
MELSEC-A
Manual control
Advanced
Manual
positioning
JOG
pulse
control
opera-
generator
tion
operation
Immediate
stop
Deceleration
stop
)
Deceleration
stop
)
Deceleration
stop
)
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Troubleshooting
