Toshiba T2N - Manual (Page 231)

5. Programming Language
218 PROSEC T2N
The action program corresponds to 1 step, and the transition condition
corresponds to 1 transition.
These are programmed by ladder diagram.
(1) Action Program
The size of 1 action program is 11 lines x 11 columns as shown
below, and the number of instruction steps is a maximum of 121
steps.
In a case when a larger size than the above is required as an
action program, a sub-routine is used. (CALL instruction)
Even if there is no action corresponding to a step, this does not
affect SFC operation. In this case, the step becomes a dummy
step (a step which waits only the next transition condition will be
satisfied).
In programming, by designating the step on the SFC screen and
selecting the detail display mode, the monitor/edit screen for the
action program corresponding to that step will appear.
In the case when the content of the action program is only 1
instruction out of the SET instruction, the RST instruction, coil,
invert coil, positive pulse coil and negative transition-sensing coil,
direct editing can be carried out without putting up the detail
display screen. See the programmer (T-PDS) operation manual in
a separate volume for this operation.
Action Program and
Transition Condition