Function Specifications - Omron CJ2 CPU UNIT User Manual

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Function Specifications

Functions
Cycle Minimum Cycle Time
Time Man-
agement
Cycle Time Monitoring
Background Processing
Unit (I/O) Basic I/O I/O
Manage- Units, Spe- Refresh-
ment cial I/O ing
Units, and
CPU Bus
Units
Unit Recognition at Startup
Basic I/O Input Response Time Setting
Units
Load OFF Function
Basic I/O Unit Status Monitoring
Reading/writing data using instruc-
tions for specific Units
Special I/O Unit Restart Bits to Restart Units
Units and
Synchronous Unit Operation
CPU Bus
Units
Configura- Automatic I/O Allocation at Startup
tion Man-
agement
I/O Table Creation
Rack/Slot First Word Settings
*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.
CJ2 CPU Unit Hardware User's Manual
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
The cycle time is monitored.
(0.01 to 40,000 ms; Unit: 0.01 ms)
Instructions with long execution times can be executed over multiple
cycles to prevent fluctuations in the cycle time.
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
The number of units recognized when the power is turned ON is dis-
played.
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.
All of the outputs on Basic I/O Units can be turned OFF when an error
occurs in RUN or MONITOR mode.
Alarm information can be read from Basic I/O Units and the number of
Units recognized can be read.
Special instructions can be used to read/write required data for specific
*1 Units at high speed.
A Special I/O Unit or CPU Bus Unit can be restarted.
*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)
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.
The current unit configuration can be registered in I/O tables to prevent it
from being changed, to reserve words, and to set words.
The first words allocated to a Units on the Racks can be set.
1 Overview
Description
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