858
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
A Programming Tool Applicability and Version Upgrade History
A-1 Programming Tool Applicability
Circuit blocks which require attention on
operation after write during RUN
Avoid write during RUN to a circuit block including the following instructions
under execution. If write during RUN is executed to such a circuit block, the
PLC decelerates and stops pulse output.
•
DSZR (FNC150), DVIT (FNC151), ZRN (FNC156), PLSV (FNC157)
instruction [with acceleration/deceleration operation], DRVI (FNC158) and/
or DRVA (FNC159) instruction
Avoid write during RUN to a circuit block including the following instruction
under execution. If write during RUN is executed to such a circuit block, the
PLC immediately stops pulse output.
•
PLSV (FNC157) instruction [without acceleration/deceleration operation]
Avoid write during RUN to a circuit block including the following instructions
under execution of communication. If write during RUN is executed to such a
circuit block, the PLC may stop communication after that.
If the PLC stops communication, set the PLC to the STOP mode once, and
then set it to the RUN mode again.
•
IVCK (FNC270), IVDR (FNC271), IVRD (FNC272), IVWR (FNC273) and/or
IVBWR (FNC274) instruction
•
Instructions for falling edge pulse
When write during RUN is completed for a circuit including an instruction for
falling edge pulse (LDF, ANDF, or ORF instruction), the instruction for
falling edge pulse is not executed without regard to the ON/OFF status of
the target device of the instruction for falling edge pulse.
When write during RUN is completed for a circuit including an instruction for
falling edge pulse (PLF instruction), the instruction for falling edge pulse is
not executed without regard to the ON/OFF status of the operation
condition device.
It is necessary to set to ON the target device or operation condition device
once and then set it to OFF for executing the instruction for falling edge
pulse.
•
Instructions for rising edge pulse
When write during RUN is completed for a circuit including an instruction for
rising edge pulse, the instruction for rising edge pulse is executed if a target
device of the instruction for rising edge pulse or the operation condition
device is ON.
Target instructions for rising edge pulse: LDP, ANDP, ORP, and pulse
operation type applied instructions (such as MOVP)
*1.
The PLS instruction is not executed.
Others
When the number of program steps is reduced by deletion of contacts, coils
and applied instructions, the program capacity becomes smaller by as many as
the reduced number of steps.
Item
Caution
Contact ON/OFF status
(while write during RUN is
executed)
Instruction for
rising edge
pulse
Instruction for
falling edge
pulse
OFF
Not executed
Not executed
ON
Executed
*1
Not executed
