Mitsubishi Electronics FX3G User Manual

FX

3S

/FX

3G

/FX

3GC

/FX

3U

/FX

3UC

 Series

Programming Manual - Basic & Applied Instruction Edition

2 Overview (Sequence Program)

Introdu

ction

Ov

ervi
ew

Instruction 

Li

st

D

evices 

in Det

ai

l

Specifi

ed the

De

vice

 &

 

C

onst
ant

Bef
ore

 

Pr

og

ra

mmi
ng

Bas
ic 

Instruction

FN
C00-FN

C0

9

Program Fl

ow

FNC

10-FN

C19

Mov
e & Com

pare

FNC

20-FNC

29

Arith. & Lo

gi

c 

Operati

on

• 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.

• 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.

• In  an  FX

3U

/FX

3UC

 PLC whose version is earlier than Ver. 2.61, do not use a memory cassette where the customer 

keyword and permanent PLC lock are set.
If a memory cassette where the permanent PLC lock is set is used in an FX

3U

/FX

3UC

 PLC whose version is earlier 

than Ver. 2.61, the PLC does not function normally.
If the PLC memory is cleared or the keyword is canceled in an FX

3U

/FX

3UC

 PLC whose version is earlier than Ver. 

2.61 for a memory cassette where the customer keyword and permanent PLC lock are set, access restrictions set 
by the keyword may not be able to be removed normally.

When the permanent PLC lock is
selected

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.

When the customer keyword is set

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.

When both the entry code and
second entry code are set

The programming tool performs the following operations in accordance with the selected registration
condition:

When only the entry code is set

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):

2) When using any programming tool or data access unit other than the FX-10P(-E)/FX-20P(-E)

Read/Incorrect write protection is set for all entry codes.

When no entry code is set

All operations are enabled.

Write prohibited

–

Read and write prohibited

–

–

All online operations prohibited

–

–

–

–

Write prohibited

–

Read and write prohibited

–

–

All online operations prohibited

–

–

–

–

Write prohibited

–

Read and write prohibited

–

–

All online operations prohibited

–

–

–

–

All operations
prohibited

A,D to F,0 to 9

–

–

–

–

Read/Incorrect
write protection

B

–

–

Erroneous write
prohibited

C

–