E-80
FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
7 Creating Programs (FX2N, FX2NC)
7.2 Common Items in Inverter Communication Instructions
7.2.4
Cautions on programming
1. Using the EXTR instruction together with another instruction
• The EXTR instruction cannot be used together with the RS instruction.
• The EXTR instruction cannot be used together with a EXTR K0 instruction.
2. When programming the EXTR instruction in a state of a STL instruction
Make sure to let the state relay remain ON until communication with an inverter is completed. If the state relay
is set to OFF during communication, the EXTR instruction is stopped in the middle of execution, and another
EXTR instruction cannot be started. Program a sequence while observing the following cautions
• Add M8029 (instruction execution complete flag) ON condition to the state relay transfer condition, and
provide such an interlock that the state relay ON/OFF status does not change during communication with
an inverter.
If the state changes during communication, communication may not be performed normally.
• When resetting many state relays all at once using ZRST (FNC 40) instruction, etc., make sure that the
M8155 (communication port busy) OFF condition is established.
3. Using the EXTR instruction in a program flow
The EXTR instruction cannot be used in the following program flows
4. Caution on write during RUN
1) Condition in which the EXTR instruction can be written
While the PLC is in the STOP status, the EXTR instruction can be written during RUN.
2) Condition in which the EXTR instruction cannot be written
The EXTR instruction cannot be written during RUN.
If the EXTR instruction is written during RUN while communication or if the EXTR instruction is deleted in
RUN mode, communication may be disabled after that. (In such a case, set the PLC to STOP, and then to
RUN mode again to initialize the status.)
5. When using the E500 Series
Parameters Nos. 922 and 923 in the E500 Series cannot be used in inverter communication.
Program flow disabling the EXTR instruction
Remarks
Between CJ and P instructions
Conditional jump
Between FOR and NEXT instructions
Repeat
Between P and SRET instructions
Subroutine
Between I and IRET instructions
Interrupt routine
SET
M0
Reset input
State relays S0 to S999
are reset all at once.
RST
M0
S0
S999
FNC 40
ZRST
M0
X000
M8155
Communication
port busy
Summary of Contents for FX-485ADP
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Page 120: ...B 2 FX Series PLC User s Manual Data Communication Edition N N Network ...
Page 188: ...C 2 FX Series PLC User s Manual Data Communication Edition Parallel Link ...
Page 244: ...D 2 FX Series PLC User s Manual Data Communication Edition Computer Link ...
Page 344: ...E 2 FX Series PLC User s Manual Data Communication Edition Inverter Communication ...
Page 700: ...H 2 FX Series PLC User s Manual Data Communication Edition Programming Communication ...
Page 752: ...I 2 FX Series PLC User s Manual Data Communication Edition Remote Maintenance ...
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