Mitsubishi Electric MELSEC FX3U Programming Manual page 736

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. Related devices
Number
ch1 ch2
M8029
M8063 M8438 Serial communication error
M8151 M8156 Inverter communicating
M8152 M8157 Inverter communication error
M8153 M8158
M8154 M8159 IVBWR instruction error
*1. Cleared when the PLC mode switches from STOP to RUN.
*2. Initial value: -1
Cautions
• 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
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"
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
*3
normally .
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.
734
→ For the instruction execution complete flag use method, refer to Subsection 6.5.2.
Description
Instruction execution complete
*1
Inverter communication error
*1
latch
*1
→ For other cautions, refer to the Data Communication Edition manual.
*1
.
*2
is made valid using Pr297.
30 External Device Communication (Inverter Communication) – FNC270 to FNC274
30.4 FNC273 – IVWR / Inverter Parameter Write
Number
ch1 ch2
D8063 D8438 Error code of serial communication error
D8150 D8155 Response wait time in inverter communication
D8151 D8156 Step number in inverter communication
*1
D8152 D8157
D8153 D8158
D8154 D8159 IVBWR instruction error parameter number
Description
Error code of inverter communication
*1
error
Latch of inverter communication error
*2
occurrence step
*2
*2