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FX3G/
FX
3U
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3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
30 External Device Communication (Inverter Communication) – FNC270 to FNC274
30.4 FNC273 – IVWR / Inverter Parameter Write
2. Related devices
→ 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
Cautions
→ 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.
PLC applicable version
The table below shows PLC versions applicable to each inverter.
Number
Description
Number
Description
ch1 ch2 ch1 ch2
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
PLC FREQROL-V500/F500/A500/E500/S500 FREQROL-F700/A700 FREQROL-E700/D700
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