Write Protection From Fins Commands - Omron CJ2 CPU - REV 10-2010 User Manual

10 CPU Unit Functions
Application Example: Operating the Program Only for a CPU Unit with a
Specific Production Lot Number
CPU Unit
Lot No. 070413
If the hardware is correct, main
processing is performed.

10-6-4 Write Protection from FINS Commands

It is possible to prohibit write operations and other editing operations sent to the PLC's CPU Unit as
FINS commands through a network (including write operations from CX-Programmer, CX-Protocol, CX-
Process, and other applications using FinsGateway, but excluding a direct serial connection). Read pro-
cesses are not prohibited.
FINS write protection can disable write processes such as downloading the user program, PLC Setup,
or I/O memory, changing the operating mode, and performing online editing.
It is possible to exclude selected nodes from write protection so that data can be written from those
nodes.
An event log in the CPU Unit automatically records all write processes sent through the network and
that log can be read with a FINS command.
Example:
Computer #1
PLC#1
Note This function prohibits writing by FINS commands only, so it has no effect on write operations by functions other than
FINS commands, such as data links.
10-56
A100.02 and A100.01: #07041300
FB
=L
A100.01
#07041300
Verification OK
Main processing
Lot number output.
070413?
Yes
Write operations by FINS
commands are prohibited from
some nodes in the network (in
this example, computer #1, PLC
#1, and PLC #2).
Network
Network
Write access to this PLC
is enabled/disabled.
The lot number is stored in
words in the Auxiliary Area.
Verification
OK
Main processing is
performed if the hardware lot
number is 070413. If it is not,
main processing is not
performed.
Note: This processing is read-protected, so it cannot be
altered by someone else.
No
If the hardware is incorrect, main
processing is not performed.
Computer #2
PLC#2 PLC#3
Network
Write operations by FINS commands
are not prohibited from selected
nodes in the network (in this
example, computer #2 and PLC #3).
CJ2 CPU Unit Software User's Manual