E-67
FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
7 Creating Programs (for FX2N and FX2NC PLCs)
7.2 Common Items in Inverter Communication Instructions
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter
Communication
F
Non-Protocol
Communication
(RS/RS2 Instruction)
G
Non-Protocol
Communication
(FX
2N
-232IF)
H
Programming
Communication
I
Remote
Maintenance
Apx.
Discontinued
models
7.2.4 Cautions on programming
1. Using EXTR instruction together with another instruction
• EXTR instruction cannot be used together with RS instruction.
• EXTR instruction cannot be used together with EXTR K0 instruction.
2. When programming EXTR instruction in a state of 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, 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 relay is set to OFF during communication, the remaining communication can be completed by
setting the state relay to ON again.
• 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 EXTR instruction in a program flow
EXTR instruction cannot be used in the following program flows
4. Caution on write during RUN
1) Condition in which EXTR instruction can be written
While the PLC is in the STOP status, EXTR instruction can be written during RUN.
2) Condition in which EXTR instruction cannot be written
EXTR instruction cannot be written in RUN mode by personal computer programming software.
If EXTR instruction is written during RUN while communication or if 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 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
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