Omron CJ1M-CPU series User Manual

34
CJ1-H/CJ1M CPU Unit Ver. 2.0 Upgrades Section 1-5
Auxiliary Area Flags and Bits related to Password Protection
1-5-3 Write Protection from FINS Commands Sent to CPU Units via
Networks
Previous CPU Units (Pre-Ver. 2.0 CPU Units)
With the pre-Ver. 2.0 CS/CJ-series CPU Units, there was no way to prohibit
write operations and other editing operations sent to the PLC's CPU Unit as
FINS commands through a network such as Ethernet, i.e., connections other
than direct serial connections.
CPU Unit Ver. 2.0 or Later
Summary With the CPU Unit Ver. 2.0 and later CS/CJ-series CPU Units, 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 Fin-
sGateway). Read processes 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.
Name Bit
address
Description
UM Read Protection
Flag
A09900 Indicates whether or not the PLC (the entire user
program) is read-protected.
0: UM read protection is not set.
1: UM read protection is set.
Task Read Protec-
tion Flag
A09901 Indicates whether or not selected program tasks
are read-protected.
0: Task read protection is not set.
1: Task read protection is set.
Program Write Pro-
tection for Read Pro-
tection
A09902 Indicates whether or not the write protection
option has been selected to prevent overwriting
of password-protected tasks or programs.
0: Overwriting allowed
1: Overwriting prohibited (write-protected)
Enable/Disable Bit
for Program Backup
A09903 Indicates whether or not a backup program file
(.OBJ file) can be created when UM read protec-
tion or task read protection is set.
0: Creation of backup program file allowed
1: Creation of backup program file prohibited

Omron CJ1M-CPU series Specifications

General

Brand	Omron
Model	CJ1M-CPU series
Category	Controller
Language	English