Mitsubishi Electric Q172CPU Programming Manual page 532

8 AUXILIARY AND APPLIED FUNCTIONS
[Cautions]
(1) Single block mode signal (M4408) and single block command (M4403+10n)
If the single block by single block mode signal (M4408) and the single block by
single block command (M4403+10n) are executed simultaneously, the operation
by the single block command (M4403+10n) is made invalid.
(2) Emergency stop, stop command, rapid stop command and error when single
block in progress signal (M4009) is ON
When the single block processing signal (M4009) is ON, it does not turn OFF if an
emergency stop, stop command or rapid stop command is executed, or an error
occurs.
The single block processing signal (M4009) turns OFF by turning OFF the single
block mode signal (M4408) and then turning the single block start signal (M4409)
from OFF to ON.
(3) Status at termination of one block execution when single block in progress is ON
If one block execution ends when the single block processing signal (M4009) is
ON, the automatic start signal (M4002+10n) does not turn OFF. At this time, the
command in-position signal (M2403+20n) turns ON.
(4) Single block start during move instruction execution
The single block start is not accepted during axis travel (except high-speed
oscillation). Make a single block start after the axis has been stopped by single
block.
8 - 85