5 Version Information and Peripheral Equipment Connectability
5.2 Programming Tool Applicability
48
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
Item Caution
Circuit blocks which cannot be
written in RUN mode
Avoid write during RUN to a circuit block including the following instructions during execution.
If write during RUN is executed to such a circuit block, the PLC decelerates and stops pulse
output.
• DSZR (FNC150), 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 during 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 during 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) and/or IVWR (FNC273) 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.
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 device that is set as the operation condition.
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.
Circuit blocks which require attention
on operation after write during RUN
Writing in RUN mode to circuit blocks including the following instructions results in the following
operation
• MEP instruction (Conversion of operation result to leading edge pulse instruction)
When completing Write during RUN to a circuit including the MEP instruction, the execution
result of the MEP instruction turns ON (conducting state) if the operation result up to the MEP
instruction is ON.
• MEF instruction (Conversion of operation result to trailing edge pulse instruction)
When completing Write during RUN to a circuit including the MEF instruction, the execution
result of the MEF instruction turns OFF (nonconducting state) regardless of the operation result
(ON or OFF) up to the MEF instruction.
When the operation result up to the MEF instruction is set to ON once and then set to OFF, the
execution result of the MEF instruction turns ON (conducting state)
Others
• When writing during RUN with GX Developer Ver. 8.72A or later, the program is as follows.
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.
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
Operation result up to MEP/MEF instruction MEP instruction MEF instruction
OFF
OFF (nonconduct-
ing)
OFF (nonconduct-
ing)
ON ON (conducting)
OFF (nonconduct-
ing)
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