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3. POSITIONING SIGNALS
The user must not turn start accept flags ON/OFF.
• If a start accept flag that is ON is switched OFF with the sequence program or a peripheral
device, no error will occur but the positioning operation will not be reliable. Depending on the
type of machine, it might operate in an unanticipated manner.
• If a start accept flag that is OFF is switched ON with the sequence program or a peripheral
device, no error will occur at that time, but the next time an attempt is made to start the axis an
error will occur during a start accept flag being ON and the axis will not start.
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2) When positioning control is executed by turning ON the JOG operation
command (M1802+20n or M1803+20n), the start accept flag goes OFF
when positioning is stopped by turning the JOG operation command
OFF.
3) The start accept flag is ON while the manual pulse generator enable flag
(M2012: ON) is ON.
The start accept flag is OFF while the manual pulse generator enable
flag (M2012: OFF) is OFF.
4) The start accept flag is ON during a current value change initiated by a
DSFLP instruction. It goes OFF on completion of the present value
change.
DSFLP/CHGA
instruction
Start accept
instruction(M200n)
5) When M2000 is OFF, execution of a DSFRP/SVST instruction causes
the start accept flag to come ON; the flag goes OFF when M2000 comes
ON.
PLC READY (M2000)
DSFRP/SVST instruction
Start accept flag
REMARK
A numerical value corresponding to an axis number is entered for "n" in
"M2001 + n".
<A172SHCPUN>
Axis No.
1
2
3
4
5
6
7
8
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ON
Present value change
OFF
processing in progress
OFF
ON
OFF
CAUTION
n
0
1
2
3
4
5
6
7
3 − 21
Goes OFF on completion of
present value change processing
ON
<A171SHCPUN>
Axis No.
n
1
0
2
1
3
2
4
3
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