Mitsubishi Electric MELSEC FX3U Programming Manual page 52

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
3. Entry code setting and access restriction
Setting status
When the permanent PLC lock
is selected
When the customer keyword is
set
When both the entry code and
second entry code are set
When only the entry code is
set
When no entry code is set
Caution on selecting the permanent PLC lock
• Once the permanent PLC lock is set, it cannot be reset.
To reset the permanent PLC lock or write programs again to the PLC, all-clear the PLC memory.
Caution on registering the entry code
• The entry codes are provided to restrict access from peripheral equipment to programs created by the
user. Take care to save/remember the entry codes.
If a registered entry code is forgotten, the online operations from the programming tool to the PLC are
disabled depending on the programming tool type and the contents of the registered entry code.
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Peripheral equipment and access restriction
The programming tool performs the following operations in accordance with the selected
registration condition:
Once the permanent PLC lock is set, it cannot be reset.
To reset the permanent PLC lock or write programs again to the PLC, all-clear the PLC
memory.
Registration condition
Write prohibited
Read and write prohibited
All online operations prohibited
The programming tool performs the following operations in accordance with the selected
registration condition:
It is not possible to cancel the entry code using the customer keyword.
Registration condition
Write prohibited
Read and write prohibited
All online operations prohibited
The programming tool performs the following operations in accordance with the selected
registration condition:
Registration condition
Write prohibited
Read and write prohibited
All online operations prohibited
1) When using handy programming panel FX-10P(-E)/FX-20P(-E)
The programming tool performs the following operations in accordance with the head
character of the entry code (in 8 characters):
Head
character of
entry code
All operations
A,D to F,0 to 9
prohibited
Read/Incorrect
write B
protection
Erroneous
C
write prohibited
2) When using any programming tool, data access unit or GOT other than the FX-10P(-E)/
FX-20P(-E)
Read/Incorrect write protection is set for all entry codes.
All operations are enabled.
2 Overview (Sequence Program)
2.7 Types and Setting of Parameters
Program
Monitoring
Read Write
–
– –
– – –
Program
Monitoring
Read Write
–
– –
– – –
Program
Monitoring
Read Write
–
– –
– – –
Program
Monitoring
Read Write
– – –
– –
–
Present value
change
–
Present value
change
–
Present value
change
–
Present value
change
–