Mitsubishi Electric FX3U-232-BD User Manual page 445

FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
6. Cautions when using the password function for inverter
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
Hence, when a password disable error occurs in the inverter in which "display of the number of times of
password disable error"
disable error displayed in accordance with the setting of Pr297 may not be the same as the actual
number of times of password input error as described below.
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 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 disable error" is enabled using Pr297 and when a
password disable error occurs 5 times, the "reading/writing restriction" cannot be disabled even if the
right password is input. For recovery from this status, it is necessary to all-clear all parameters.
*3. When the value given as a result of reading Pr297 is "0" to "4", registration of the password is
completed normally.
*1
.
*2
is enabled using Pr297, please note that the number of times of password
9 Creating Programs (FX3S, FX3G, FX3GC, FX3U, FX3UC)
9.3 Common Items in Inverter Communication Instructions
A
B
C
D
E
F
G
H
I
Apx.A
E-103