Mitsubishi Electric FR-A820-00046 Instruction Manual page 418

(E) Environment setting parameters
If a communication option is installed, an option fault Option fault (E.OPT) occurs, and the inverter
output shuts off. (Refer to page 6-28.)
The PLC function user parameters (Pr. 1150 to Pr. 1199) can be written and read by the PLC function
regardless of the Pr. 296 setting.
Registering a password (Pr. 296, Pr. 297)
The following section describes how to register a password.
Set the parameter reading/writing restriction level. (Pr. 296 ≠ "9999")
Pr. 296 setting
100 to 106, 199
During Pr. 296 = any of "100 to 106, 199", if password unlock error has occurred 5 times, correct
password will not unlock the restriction. All parameter clear can unlock the restriction. (In this case,
the parameters are returned to their initial values.)
Write a four-digit number (1000 to 9998) in Pr. 297 as a password. (Writing is disabled when Pr. 296
= "9999".) When a password is registered, parameter reading/writing is restricted with the restric-
tion level set in Pr. 296 until unlocking.
NOTES After registering a password, the read value of Pr. 297 is always one of "0 to 5".
Even if a password is registered, the parameters, which the inverter itself writes, such as inverter
parts life are overwritten as needed.
Even if a password is registered, reading/writing is enabled for Pr. 991 "PU contrast adjustment"
when the parameter unit (FR-PU07) is connected.
5 - 216
Password unlock error restriction
0 to 6, 99
appears when a password restricted parameter is read/written.
No restriction
Restricted at fifth error
Parameters
Pr. 297 display
Always displays 0
Displays the error count (0 to 5)