913
Step Instructions Section 3-22
A20012 (Step Flag) is turned ON for one cycle when STEP(008) is executed.
This flag can be used to conduct initialization once the step execution has
started.
Placement Conditions for Step Programming Areas (STEP B to STEP)
STEP(008) and SNXT(009) cannot be used inside of subroutines, interrupt
programs, or block programs.
Be sure that two steps are not executed during the same cycle.
Instructions that Cannot be Used Within Step Programs
The instructions that cannot be used within step programs are listed in the fol-
lowing table.
Related Bits
Function Mnemonic Name
Sequence Control Instruc-
tions
END(001) END
IL(002) INTERLOCK
ILC(003 INTERLOCK CLEAR
JMP(004) JUMP
JME(005) JUMP END
CJP(510) CONDITIONAL JUMP
CJPN(511) CONDITIONAL JUMP
NOT
JMP0(515) MULTIPLE JUMP
JME0(516) MULTIPLE JUMP END
Subroutine Instructions SBN(092) SUBROUTINE ENTRY
RET(093) SUBROUTINE RETURN
Name Address Details
Step Flag A20012 ON for one cycle when a
step program is started
using STEP(008). Can be
used to reset timers and
perform other processing
when starting a new step.
1 cycle
Start
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