Mitsubishi FX3UC SERIES User Manual page 423

FX Series Programmable Controllers
3UC
User's Manual - Hardware Edition
Circuit blocks which require attention on
operation after write during RUN
Others
Item
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), IVWR (FNC273)
and/or IVBWR (FNC274) instruction
• 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)
(while write during RUN is
*1. The PLS instruction is not executed.
• 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).
Operation result up to
MEP/MEF instruction
When writing during RUN with GX Developer Ver. 8.13P 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.
A Version Information and Peripheral Equipment Connect ability
Caution
Contact ON/OFF status
executed)
OFF
ON
MEP instruction
OFF
(nonconducting)
ON
(conducting)
A-2 Programming Tool Applicability
Instruction for Instruction for
rising edge falling edge
pulse pulse
Not executed Not executed
*1
Not executed
Executed
MEF instruction
OFF OFF
(nonconducting)
ON OFF
(nonconducting)
11
12
A
B
C
D
E
F
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