1-13
1 Overview
CJ2 CPU Unit Hardware User’s Manual
1-3 Specifications
1
1-3-3 Function Specifications
1-3-3 Function Specifications
Functions Description
Cycle
Time Man-
agement
Minimum Cycle Time A minimum cycle time can be set.
(0.2 to 32,000 ms; Unit: 0.1 ms)
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)
Manage-
ment
Basic I/O
Units, Spe-
cial I/O
Units, and
CPU Bus
Units
I/O
Refresh-
ing
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 dis-
played.
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 decreases 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.
Special I/O
Units and
CPU Bus
Units
Unit Restart Bits to Reset Units A Special I/O Unit or CPU Bus Unit can be reset.
Configura-
tion Man-
agement
Automatic I/O Allocation at Startup I/O words can be automatically allocated to the Basic I/O Units that are
started 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
Manage-
ment
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 The whole user program can be read 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.
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