Symbolic Information Storage And Block Password; Storage Of Symbolic Information; Block Password - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
6.6

Symbolic information storage and block password

6.6.1

Storage of symbolic information

The FX /FX
3U 3UC
as structure and labels).
By using this function, you can read symbolic information from the PLC, and edit labels, function blocks, etc.
GX Works2 Ver. 1.62Q or later is required to store symbolic information.
→ Refer to the GX Works2 Version 1 Operating Manual (Common) for the details on symbolic information.
Cautions
• When symbolic information is stored, it is deleted if the memory capacity set by parameters is changed.
After changing the memory capacity, write the symbolic information again.
• Memory cassettes (except for the FX
by FX /FX
3U 3UC
but the written symbolic information is invalid.
• For writing symbolic information and changing the set values of timers and counters using a peripheral
device, it is recommended to create programs with set values specified indirectly.
If the set values are specified directly, programs cannot be restored from symbolic information after the set
values are changed.
6.6.2

Block password

In GX Works2, program parts can be protected by setting the block password.
In the FX /FX
3U 3UC
password.
→ Refer to the GX Works2 Version 1 Operating Manual (Common) for the details on the block password.
Cautions
• In the PLC written by the 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 stores the
symbolic information.
For editing programs using a peripheral device which cannot read symbolic information (only supported by
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 the 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 the block password for which the setting "Read-protect the
execution program" is valid to the FX
• If a memory cassette which saves programs including a block password for which the setting "Read-
protect the execution program" is valid is used for the FX
the FX /FX
3U
178
PLC Ver. 3.00 or later can store symbolic information (data indicating the program configuration such
PLCs whose version is earlier than Ver. 3.00. In that case, the FX
PLC Ver. 3.00 or later, the setting "Read-protect the execution program" is available for the block
3U
PLC does not run normally.
3UC
6.6 Symbolic information storage and block password
-FLROM-1M) which save symbolic information are also supported
3U
/FX PLC whose version is earlier than 3.00.
3UC
/FX
3U
6 What to Understand before Programming
/FX
3U 3UC
PLC whose version is earlier than 3.00,
3UC
PLC operates,