Learning to Use the FX Family for Positioning Control Inverter Drive Control
4 - 26
MITSUBISHI ELECTRIC
To use the special inverter communication instructions from the PLC, inverter and PLC communica-
tion parameters must be set. The FX
2N(C
)
, FX
3G
, FX
3GC
, FX
3GE
, FX
3S
and FX
3U(C)
PLCs include the fol-
lowing special instructions to communicate with one or more inverters.
This instruction is only available for FX
3U(C)
PLCs.
The programmable controller special relays and inverter instruction codes listed in the table below
are used in Section 4.2.3. For information on memory addresses that contain error codes and inverter
communication operation statuses, refer to the FX Series User’s Manual - Data Communication Edi-
tion (JY997D16901).
Applicable for all Mitsubishi FREQROL inverters.
FX
2N(C)
FX
3G
, FX
3U(C)
Function/Description
EXTR
K10 IVCK Monitors operations of an inverter.
K11 IVDR Controls operations of an inverter.
K12 IVRD Reads a parameter from an inverter.
K13 IVWR Writes a parameter to an inverter.
—IVBWR
Writes a block of parameters to an inverter.
Tab. 4-16:
Instructions to communicate with inverters
Function name Device Length Description Applicable PLC
RUN monitor M8000 1-bit ON when PLC is in RUN.
FX
2N(C)
FX
3G
FX
3GC
FX
3GE
FX
3S
FX
3U(C)
Initial pulse M8002 1-bit ON for the first scan only.
Instruction execution
complete flag
M8029 1-bit
Programmed immediately after an inverter commu-
nication instruction. Turns ON when the preceding
instruction finishes its operation and stays ON until
the instruction stops being driven.
Tab. 4-17:
Programmable controller special relays
Function name
Instruction
Code
No. of Data
Digits
Description
Applicable
Inverter
Inverter reset H0FD 4-digits
Resets the inverter and does not request a
response. Inverter reset takes about 2.2 seconds to
complete.
Operation mode H0FB 4-digits Sets the communication operation for the inverter.
Running frequency
write
H0ED 4-digits
Changes the drive frequency by writing directly to
the inverter RAM.
Run command H0FA 2-digits
Sets forward rotation (STF) or reverse rotation
(STR).
Inverter status
monitor
H07A 2-digits Monitors operation bits of the inverter.
Output frequency
[speed]
H06F 4-digits Monitors the frequency of the inverter.
Tab. 4-18:
Inverter instruction codes
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