E-78
FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
9 Creating Programs (for FX3U and FX3UC PLCs)
9.3 Common Items in Inverter Communication Instructions
9.3.4 Cautions on programming
1. Using inverter communication instruction together with another instruction
• Inverter communication instruction using ch1 cannot be used together with RS instruction.
• Inverter communication instruction cannot be used together with RS2 instruction if RS2 instruction uses
the same channel.
2. When programming inverter communication 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, inverter communication instruction is stopped in the middle of execution,
and another inverter communication 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 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 the ZRST (FNC 40) instruction, etc., make sure that the
M8151 or M8156 (communication port busy) condition is OFF.
3. Using inverter communication instruction in a program flow
Inverter communication instruction cannot be used in the following program flows
4. Caution on writing during RUN
1) Condition in which inverter communication instruction can be written:
While the PLC is in the STOP status, inverter communication instruction can be written during RUN
.
2) Condition in which inverter communication instruction cannot be written:
Inverter communication instruction cannot be written during RUN by programming software in a personal
computer.
If an inverter communication instruction is written during RUN during communication or if an inverter
communication instruction is deleted while in RUN, 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 inverter communication 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
M8151
Communication
port busy
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