Other Functions; Symbolic Information Storage And Block Password; Storage Of Symbolic Information; Block Password - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
7.

Other Functions

7.1

Symbolic information storage and block password

7.1.1

Storage of symbolic information

The FX /FX
3U 3UC
configuration such 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.
Cautions
1) 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.
2) Memory cassettes (except for the FX
by FX /FX
3U
operates, but the written symbolic information is invalid.
3) 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.
7.1.2

Block password

In the FX /FX
3U 3UC
the block password.
Cautions
1) 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 equipment 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.
2) When a peripheral equipment 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.
3) For writing a program using a peripheral equipment other than GX Works2 (Ver. 1.62Q or later) to a PLC
that as 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.
4) It is not possible to write programs including the block password for which the setting "Read-protect the
execution program." is valid to any PLC other than the FX
5) 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 any PLC other than the FX
later), the PLC using such a memory cassette does not run normally.
PLC Ver. 3.00 or later can store symbolic information (data indicating the program
→ For details on symbolic information, refer to the GX Works2 manual.
-FLROM-1M) which save symbolic information are also supported
3U
PLCs whose version is earlier than Ver. 3.00. In that case, the FX
3UC
PLC Ver. 3.00 or later, the setting "Read-protect the execution program" is available for
→ For details on block password, refer to the GX Works2 manual.
7.1 Symbolic information storage and block password
/FX PLC whose version is 3.00 or later.
3U 3UC
/FX
3U
7 Other Functions
/FX PLC
3U 3UC
PLC (Ver. 3.00 or
3UC
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