Mitsubishi Electric MELSEC FX3U Programming Manual page 953

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Cautions on writing during RUN
Item
Program memory which can be
written in RUN mode
GX Developer
Ver.8.72A or later
Number of
program
steps which
GX Developer
can be written
Ver.8.23Z or later
for circuit
change in
RUN mode
• GX Developer
Ver.8.22Y and earlier
• FX-PCS/WIN(-E)
Circuit blocks which cannot be written
during RUN
Circuit blooks which require attention
on operation after writing during RUN
A Programming Tool Applicability and Version Upgrade History
Built-in RAM and optional memory cassette (whose write protect switch is set to OFF)
• For FX PLCs
3G
256 steps or less after edit (addition/deletion) (including NOP immediately after circuit
blocks except final circuit
• For FX /FX PLCs Ver.2.20 or later
3U 3UC
256 steps or less after edit (addition/deletion) (including NOP immediately after circuit
blocks except final circuit)
• For FX PLCs earlier than Ver.2.20
3UC
127 steps or less after edit (addition/deletion) (including NOP immediately after circuit
blocks except final circuit)
127 steps or less after edit (addition/deletion) (including NOP immediately after circuit
blocks except final circuit)
Circuit blocks in which labels P and I are added, deleted or changed in edited circuits
Circuit blocks in which 1-ms timers (T246 to T249 and T256 to T511) are added in edited circuits
Circuit blocks in which the following instructions are included in edited circuits
• Instruction to output high speed counters C235 to C255 (OUT instruction)
• SORT2 (FNC149), TBL (FNC152), RBFM (FNC278) and/or WBFM (FNC279) instruction
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
A-1 Programming Tool Applicability
Caution
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A
B
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