CJ2M-CPU3

@/-CPU1@/-MD21@

12

Function

Description

Self-

diagnosis

and

Restoration

Fatal Error

Detection

Program Error Detection

This function detects errors in programs.

Instruction Processing

Error Detection

This function detects an error when the given data value is invalid when executing an

instruction, or execution of instruction between tasks was attempted.

Indirect DM/EM BCD

Error Detection

This function detects an error when an indirect DM/EM address in BCD mode is not BCD.

Illegal Area Access Error

Detection

This function detects an error when an attempt is made to access an illegal area with an

instruction operand.

No END Error Detection

This function detects an error when there is no END instruction at the end of the program.

Task Error Detection

This function detects an error when there are no tasks that can be executed in a cycle, there

is no program for a task, or the execution condition for an interrupt task was met but there is

no interrupt task with the specified number.

Differentiation Overflow

Error Detection

This function detects an error when too many differentiated instructions are entered or deleted

during online editing (131,072 times or more).

Invalid Instruction Error

Detection

This function detects an error when an attempt is made to execute an instruction that is not

defined in the system.

User Program Area

Overflow Error Detection

This function detects an error when instruction data is stored after the last address in user

program area.

Cycle Time Exceeded Error

Detection

This function monitors the cycle time (10 to 40,000 ms) and stops the operation when the set

value is exceeded.

Fatal Error

Detection

(Continued from

previous page)

System FALS Error Detection

(User-defined Fatal Error)

This function generates a fatal (FALS) error when the user-defined conditions are met in

program.

Version Error Detection

This function detects an error when a user program includes a function that is not supported

by the current unit version.

Memory Card Transfer Error

Detection

This function detects an error when the automatic file transfer from Memory Card fails at

startup.

Maintenance

Simple Backup Function

This function collectively backs up the data in CPU Unit (user programs, parameters, and I/O

memory) and internal backup data in the I/O Units.

Unsolicited Communications

A function that allows the PLC to use Network Communications Instruction to send required

FINS commands to a computer connected via a Host Link

Remote Programming and Monitoring

Host Link communications can be used for remote programming and remote monitoring

through a Controller Link, Ethernet, DeviceNet, or SYSMAC LINK Network. Communications

across network layers can be performed.

Controller Link or Ethernet

: 8 layers

DeviceNet or SYSMAC LINK : 3 layers

Automatic Online Connection via

Network

Direct

Serial

Connection

This function enables automatically connecting to the PLC online when the CX-Programmer

is directly connected by a serial connection (peripheral (USB) port or serial port).

Via

Networks

This function enables connecting the CX-Programmer online to a PLC that is connected via an

EtherNet/IP network.

Security

Read Protection using Password

This function protects reading and displaying programs and tasks using passwords.

Write protection: Set using the DIP switch.

Read protection: Set a password using the CX-Programmer.

FINS Write Protection

This function prohibits writing by using FINS commands sent over the network.

Unit Name Function

This function allows the users to give any names to the Units. Names are verified at online

connection to prevent wrong connection

Hardware ID Using Lot Numbers

This function sets operation protection by identifying hardware using the user programs

according to lot numbers stored in the Auxiliary Area.