Datasheet

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.