1-21
1 Overview
CJ2 CPU Unit Hardware User’s Manual
1-3 Specifications
1
1-3-3 Function Specifications
*1 Supported only by CJ2H CPU Units with unit version 1.1 or later and CJ2M CPU Units.
*2 Supported only by CJ2H CPU Units with unit version 1.1 or later.
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)
The minimum cycle time setting can be changed in MONITOR mode
*1
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 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 instruc-
tions for specific Units
*1
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.
Synchronous Unit Operation
*2
The start of processing for all the specified Units can be synchronized at
a fixed interval.
Maximum number of Units: 10 Units (Only Units that support Synchro-
nous Operation Mode can be used.)
Synchronous operation cycle: 0.5 to 10 ms (default: 2 ms)
Maximum number of words for synchronous data refreshing: 96 words
(total of all Units)
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
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.
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