E-90
FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
9 Creating Programs (for FX3G, FX3U and FX3UC PLCs)
9.3 Common Items in Inverter Communication Instructions
6. 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.
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