9

CJ2M-CPU3

@/-CPU1@/-MD21@

Function Specifications

Functions

Description

Cycle Time

Management

Minimum Cycle Time

A minimum cycle time can be set.

(0.2 to 32,000 ms; Unit: 0.1 ms)

The minimum cycle time setting can be changed in MONITOR mode.

Cycle Time Monitoring

The cycle time is monitored.

(0.01 to 40,000 ms; Unit: 0.01 ms)

Background Processing

Instructions with long execution times can be executed over multiple cycles to prevent

fluctuations in the cycle time.

Unit (I/O)

Management

Basic I/O Units,

Special I/O

Units, and CPU

Bus Units

I/O Refreshing

Cyclic Refreshing

Cyclic refreshing of Basic I/O Units, Special I/O Units, and CPU Bus Units

Immediate

Refreshing

I/O refreshing by immediate refreshing instructions

Refreshing by

IORF

I/O refreshing by IORF instruction

Unit Recognition at Startup

The number of units recognized when the power is turned ON is displayed.

Basic I/O Units

Input Response Time Setting

The input response times can be set for Basic I/O Units. The response time can be

increased to reduce the effects of chattering and noise at input contacts. The response

time can be decreased to enable detecting shorter input pulses.

Load OFF Function

All of the outputs on Basic I/O Units can be turned OFF when an error occurs in RUN or

MONITOR mode.

Basic I/O Unit Status Monitoring

Alarm information can be read from Basic I/O Units and the number of Units recognized

can be read.

Reading/writing data using

instructions for specific Units

Special instructions can be used to read/write required data for specific Units at high

speed.

Special I/O

Units and CPU

Bus Units

Unit Restart Bits to Restart Units

A Special I/O Unit or CPU Bus Unit can be restarted.

Configuration

Management

Automatic I/O Allocation at Startup

I/O words can be automatically allocated to the Basic I/O Units that are connected in the

PLC to start operation automatically without registering Units into I/O tables.

I/O Table Creation

The current unit configuration can be registered in I/O tables to prevent it from being

changed, to reserve words, and to set words.

Rack/Slot First Word Settings

The first words allocated to a Units on the Racks can be set.

Memory

Management

Holding I/O Memory when Changing Operating Modes

The status of I/O memory can be held when the operating mode is changed or power is

turned ON. The forced-set/reset status can be held when the operating mode is changed

or power is turned ON.

File Memory

Files (such as program files, data files, and symbol table files) can be stored in Memory

Card, EM File Memory, or Comment Memory.

Built-in Flash Memory

The user program and Parameter Area can be backed up to an internal flash memory

when they are transferred to the CPU Unit.

EM File Function

Parts of the EM Area can be treated as file memory.

Storing Comments

I/O comments can be stored as symbol table files in a Memory Card, EM file memory,

or comment memory.

EM Configuration

EM Area can be set as trace memory or EM file memory.

Memory

Cards

Automatic File Transfer at Startup

A program file and parameter files can be read from a Memory Card when the power is

turned ON.

Program Replacement during PLC Operation

User programs can be transferred from a Memory Card to CPU Unit during operation.

Function for Reading and Writing Data from a Memory

Card

Data in I/O memory in the CPU Unit can be written to a Memory Card in CSV/TXT format.

Data in CSV/TXT format in the Memory Card can be read to I/O memory in the CPU Unit.