● When a process starts and the first scan is in progress, the step initial pulse relay (SR15)
turns ON. It turns OFF for the second and subsequent scans. This relay can be used to reset
counters and shift registers.
■
Precautions for clearing a process
● When the Next Step instruction is executed within the program of a running process, the
running process will be cleared automatically. The clearing will be done during the next scan.
Therefore, two processes may be running simultaneously for a single scan when transiting
between them. If there are two outputs which must not be ON at the same time, be sure to
provide an interlock to prevent them from tuning ON simultaneously. If these outputs can turn
ON simultaneously even when an interlock is provided by the program due to a delay in
hardware response, take a counteraction on hardware to consider the delay.
● When a process is cleared, the instructions used in the process will operate as shown in the
following table.
Type of instruction Operation
OT All OFF.
KP
Holds the stateSET
RST
TM Reset.
CT
Holds the current progress.
SR
Differential
instruction
Refer to "Operation of differential instructions between MC and MCE".
(Note 1)
Other instructions Not executed.
(Note 1) The following items are included in differential instructions.
1) DF (leading edge differential) instruction
2) Count input for CT (counter) instruction
3) Count input for UDC (up-down counter) instruction
4) Shift input for SR (shift register) instruction
5) Shift input for LRSR (left and right shift register) instruction
6) Differential execution type high-level instruction (instruction specified by p and instruction name)
3.32 SSTP (Start Step) / NSTL (Next Step) / CSTP (Clear Step) / STPE (Step
End)
3-104 WUME-FP7CPUPGR-12
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