Mitsubishi FX2-16E series, User Manual

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FX
3U
Series Programmable Controllers
User’s Manual - Hardware Edition
290
14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.7 Troubleshooting
14.7.3 Cautions on registering a keyword
1. Cautions on registering a keyword
The keyword limits access to the program prepared by the user from peripheral devices.
Retain the keyword carefully.
If you forget the keyword, you cannot operate the PLC online from a programming tool depending on the type
of programming tool and the registered keyword.
2. Cautions on using peripheral devices not supporting the second keyword
Sequence programs for which the second keyword has been registered cannot be all-cleared using a
peripheral device that does not support the second keyword (such as GX Developer earlier than Ver. 8.24A).
3. Cautions on using peripheral devices not supporting the customer keyword
Sequence programs for which the customer keyword has been registered cannot be all-cleared using a
peripheral device that does not support the customer keyword (such as GX Developer earlier than Ver.
8.89T).
4. Non-resettable protect function
When the non-resettable protect function is set, the protect function cannot be reset.
5. Cautions on using a memory cassette in which keywords are already set
In FX
3U
PLCs whose version is earlier than Ver. 2.61, do not use a memory cassette in which the customer
keyword or permanent PLC lock is set.
If a memory cassette where the permanent PLC lock is set is used in an FX
3U
PLC whose version is earlier
than Ver. 2.61, the PLC does not run normally.
If the PLC memory is cleared or the keyword is canceled in a PLC whose version is earlier than Ver. 2.61 for
a memory cassette where the customer keyword or permanent PLC lock are set, access restrictions of the
keyword may not be removed normally.
14.7.4 Cautions on using block password
Note the following cautions when using a block password for which the setting "Read-protect the execution
program." is valid.
• In a PLC that has been written to by a computer using a project including a block password for which the
setting "Read-protect the execution program." is valid, restoration of programs is enabled only when the
PLC is able to store symbolic information.
To allow for editing of the program by peripheral devices that do not support symbolic information (only
supported in GX Works2 Ver. 1.62Q or later), do not use a block password for which the setting "Read-
protect the execution program." is valid.
• When a peripheral device tries to read an execution program from a PLC that has been written to by a
computer using a project including a block password for which the setting "Read-protect the execution
program." is valid, a communication error occurs and reading is disabled.
• For writing a program using a peripheral device other than GX Works2 (Ver. 1.62Q or later) to a PLC that
has been written to by a computer using a project including a block password for which the setting "Read-
protect the execution program." is valid, execute "Clear PLC memory" to clear programs before writing.
If a program is written without executing "Clear PLC memory" in advance, the written program cannot be
read.
• It is not possible to write programs including a block password for which the setting "Read-protect the
execution program." is valid to a FX
3U
PLC whose version is earlier than Ver. 3.00.
• If a memory cassette storing a program that includes a block password for which the setting "Read-protect
the execution program." is valid is used for a FX
3U
PLC whose version is earlier than Ver. 3.00, the FX
3U
PLC does not run normally.