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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
A Programming Tool Applicability and Version Upgrade History
A-1 Programming Tool Applicability
Circuit blooks which require attention on
operation after writing during RUN
During RUN, avoid writing to a circuit block including the following instructions under execution. If
writing is executed during RUN 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
During RUN, avoid writing to a circuit block including the following instruction under execution. If
writing is executed during RUN to such a circuit block, the PLC immediately stops pulse output.
• PLSV (FNC157) instruction [without acceleration/deceleration operation]
During RUN, avoid writing 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
During RUN, avoid writing to a circuit block including the following instruction under execution.
If such writing is executed during RUN, instructions being executed are canceled.
• FLCRT (FNC300), FLDEL (FNC301), FLWR (FNC302), FLRD (FNC303),
FLCMD (FNC304) and/or FLSTRD (FNC305) instruction
When writing to a circuit block during RUN, which includes the following instructions, the following
results.
• instruction for falling edge pulse
When writing is completed during RUN 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 writing is completed during RUN 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 to execute the instruction for falling edge pulse.
• Instruction for rising edge pulse
When writing is completed during RUN 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.
When writing to a circuit block during RUN, which includes the following instructions, the following
results.
• Pulse instruction during rising edge of operation results (MEP instruction)
After writing to the circuit with MEP instructions during RUN, the MEP instruction result turns ON
(conductive) while the operation results leading up to the MEP instruction are ON.
• Pulse instruction during falling edge of operation results (MEF instruction)
After writing to the circuit with MEF instructions during RUN, the MEF instruction result turns OFF
(non-conductive), regardless of the operation results up to the MEF instruction.
The operation results of the MEF instruction turns ON (conductive) when the operation results
leading up to the MEF instruction are turned OFF.
Other
• When GX Developer Ver. 8.13P or later is used in FX
3U/FX3UC PLCs to write data during RUN,
the following will occur.
If the number of program steps is reduced by deleting contact or coil application instructions, etc.,
the program becomes shorter by the number of reduced steps.
• When GX Developer Ver. 8.72A or later is used in FX
3G PLCs to write data during RUN, the
following will occur.
If the number of program steps is reduced by deleting contact or coil application instructions, etc.,
the program becomes shorter by the number of reduced steps.
Item Caution
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
Operation results leading up to MEP/MEF
instruction
MEP instruction MEF instruction
OFF
OFF
(non-conductive)
OFF
(non-conductive)
ON
ON
(conductive)
OFF
(non-conductive)