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FX

3G

/FX

3U

/FX

3UC

 Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

30 External Device Communication (Inverter Communication) – FNC270 to FNC274

→ For the instruction execution complete flag use method, refer to Subsection 6.5.2.

*1.

Cleared when the PLC mode switches from STOP to RUN.

*2.

Initial value: -1

→ For other cautions, refer to the Data Communication Edition manual.

• It is not permitted to use an RS (FNC 80)/RS2 (FNC 87)/FLCRT (FNC300)/FLDEL (FNC301)/FLWR (FNC302)/

FLRD (FNC303)/FLCMD (FNC304)/FLSTRD (FNC305) instruction and an IVCK (FNC270)/IVDR (FNC271)/
IVRD (FNC272)/IVWR (FNC273)/IVBWR (FNC274) instruction for the same port.

• Two or more inverter communication instructions (FNC270 to FNC274) can be driven for the same port at the same 

time.

• Cautions on using the password function in the D700 Series.
1) When a communication error occurs

When a communication error occurs in an inverter communication instruction, the FX PLC automatically retries
communication up to 3 times

*1

.

Accordingly, note that the number of times of password reset error displayed in accordance with the setting of
Pr297 may not agree with the actual number of times of password input error as described below when a
password reset error occurs in the D700 Series in which "display of the number of times of password reset error"

*2

is made valid using Pr297.
Do not execute automatic retry (re-driving of an inverter instruction) using a sequence program when writing data
to Pr297.

Cases in which a password reset error occurs in an inverter communication instruction, and the actual number of
times of reset error in such cases.

-

When a wrong password is written to Pr297 due to a password input error
When the writing instruction is executed once, a password reset error occurs 3 times.

-

When the password cannot be written correctly to Pr297 due to noise, etc.
A password reset error occurs up to 3 times.

2) When registering the password

When registering the password in the D700 Series inverter using an inverter communication instruction, write the
password to Pr297, read Pr297, and then confirm that registration of the password is completed normally

*3

.

If writing of the password to Pr297 is not completed normally due to noise, etc., the FX PLC automatically retries
writing, and the registered password may be reset by the retry.

*1.

The FX PLC executes the first communication, and then retries communication twice (3 time in total).

*2.

When "display of the number of times of password reset error" is made valid in the D700 Series using Pr297
and when a password reset error occurs 5 times, the "reading/writing restriction" cannot be reset even if the
right password is input.
For recovery from this status, it is necessary to all-clear all parameters in the D700 Series.

*3.

When the value given as a result of reading Pr297 is "0" to "4", registration of the password is completed
normally.

The table below shows PLC versions applicable to each inverter.

M8029

Instruction execution complete

D8063

D8438

Error code of serial communication error

M8063

M8438 Serial communication error

D8150

D8155

Response wait time in inverter communication

M8151

M8156 Inverter communicating

*1

D8151

D8156

Step number in inverter communication

*2

M8152

M8157 Inverter communication error

*1

D8152

D8157

Error code of inverter communication 
error

*1

M8153

M8158

Inverter communication error 
latch

*1

D8153

D8158

Latch of inverter communication error 
occurrence step

*2

M8154

M8159 IVBWR instruction error

*1

D8154

D8159

IVBWR instruction error parameter number

*2

FX

3G

Ver.1.10 or later

FX

3U

Ver.2.20 or later

Ver.2.32 or later

FX

3UC

Ver.1.00 or later

Ver.2.20 or later

Ver.2.32 or later