Yaskawa YASNAC PC NC I/O Signal Function Manual - Manual (Page 27)

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YASNAC PCNC I/O Signal Function Manual Chapter 4: M, S, T, and B Functions
If an M/S/T/B command is specified along with an axis movement command in the same
block, the M/S/T/B command is executed simultaneously with the axis movement.
Fig. 4.4 M/S/T/B Code Signal Time Chart when Specified with
an Axis Movement Command in the Same Block
M code output
FIN input
To the next step
Axis movement
M code read output