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CJ-series CJ1M CPU Units (with Built-in I/O)


Compact, Applications-oriented Controllers with Built-in Pulse I/O for High Potential

Common Specifications

Item Specifications
Control method Stored program
I/O control method Cyclic scan and immediate processing are both possible.
Programming LD (Ladder), SFC (Sequential Function Chart), ST (Structured Text), Mnemonic
CPU processing mode Normal Mode or Peripheral Servicing Priority Mode
Instruction length 1 to 7 steps per instruction
Ladder instructions Approx. 400 (3-digit function codes)
Execution time Basic instructions: 0.10 μs min.
Special instructions: 0.15 μs min.
Overhead time CJ1M CPU Units (CPU22/23): 0.5 ms min.
CJ1M CPU Units (CPU21): 0.7 ms min.
Unit connection method No Backplane: Units connected directly to each other.
Mounting method DIN Track (screw mounting not possible)
Maximum number of
connectable Units
Total of 20 Units in the System, including 10 Units on CPU Rack and 10 Units on one Expansion Rack.
Maximum number of
Expansion Racks
CJ1M CPU Units (CPU 13/23 only): 1 max. (An I/O Control Unit is required on the CPU Rack and an I/O
Interface Unit is required on the Expansion Rack.)
CJ1M CPU Units (CPU11/12/21/22): Expansion is not possible.
Number of tasks 288 (cyclic tasks: 32, interrupt tasks: 256)
Interrupt tasks can be defined as cyclic tasks called "extra cyclic tasks." Including these, up to 288 cyclic
tasks can be used.
Note 1.
Cyclic tasks are executed each cycle and are controlled with TKON(820) and TKOF(821) instructions.
Note 2.
The following 4 types of interrupt tasks are supported.
Power OFF interrupt tasks: 1 max.
Scheduled interrupt tasks: 2 max.
I/O interrupt tasks: 32 max.
External interrupt tasks: 256 max.
Interrupt types Scheduled Interrupts:
Interrupts generated at a time scheduled by the CPU Unit's built-in timer. (See note. 1)
I/O Interrupts: Interrupts from Interrupt Input Units.
Power OFF Interrupts (See note 2.): Interrupts executed when the CPU Unit's power is turned OFF.
External I/O Interrupts: Interrupts from the Special I/O Units or CPU Bus Units.
Note 1.
Scheduled interrupt time interval is 0.5 ms to 999.9 ms (in increments of 0.1 ms), 1 ms to 9,999 ms (in
increments of 1 ms), or 10 ms to 99,990 ms (in increments of 10 ms)
Note 2. Not supported when the CJ1W-PD022 Power Supply Unit is mounted.
Calling subroutines
from more than one
Supported (called "global subroutines").
Function blocks (CPU
Unit with unit version
3.0 or later only)
Languages in function block definitions: ladder programming, structured text
(Core I/O)
I/O Area 1,280: CIO 000000 to CIO 007915 (80 words from CIO 0000 to CIO 0079)
The setting of the first word can be changed from the default (CIO 0000) so that CIO
0000 to CIO 0999 can be used.
I/O bits are allocated to Basic I/O Units.
The CIO Area
can be used
as work bits
if the bits are
not used as
shown here.
Link Area 3,200 (200 words): CIO 10000 to CIO 119915 (words CIO 1000 to CIO 1199)
Link bits are used for data links and are allocated to Units in Controller Link Systems.
Unit Area
6,400 (400 words): CIO 150000 to CIO 189915 (words CIO 1500 to CIO 1899)
CPU Bus Unit bits store the operating status of CPU Bus Units.
(25 words per Unit, 16 Units max.)
I/O Unit
15,360 (960 words): CIO 200000 to CIO 295915 (words CIO 2000 to CIO 2959)
Special I/O Unit bits are allocated to Special I/O Units. (10 words per Unit, 96 Units max.)
Note: Special I/O Units are I/O Units that belong to a special group called "Special I/O
Example:CJ1W-AD081 Analog Input Unit
PLC Link
1,440 (90 words): CIO 310000 to CIO 318915 (words CIO 3100 to CIO 3189)
9,600 (600 words): CIO 320000 to CIO 379915 (words CIO 3200 to CIO 3799)
DeviceNet bits are allocated to Slaves for DeviceNet Unit remote I/O communications
when the Master function is used with fixed allocations.
Fixed allocation setting 1 Outputs: CIO 3200 to CIO 3263
Inputs: CIO 3300 to CIO 3363
Fixed allocation setting 2 Outputs: CIO 3400 to CIO 3463
Inputs: CIO 3500 to CIO 3563
Fixed allocation setting 3 Outputs: CIO 3600 to CIO 3663
Inputs: CIO 3700 to CIO 3763
The following words are allocated to the Master function even when the DeviceNet Unit
is used as a Slave.
Fixed allocation setting 1 Outputs: CIO 3370 (Slave to Master)
Inputs: CIO 3270 (Master to Slave)
Fixed allocation setting 2 Outputs: CIO 3570 (Slave to Master)
Inputs: CIO 3470 (Master to Slave)
Fixed allocation setting 3 Outputs: CIO 3570 (Slave to Master)
Inputs: CIO 3470 (Master to Slave)
I/O Area
4,800 (300 words): CIO 120000 to CIO 149915 (words CIO 1200 to CIO 1499)
37,504 (2,344 words): CIO 380000 to CIO 614315 (words CIO 3800 to CIO 6143)
These bits in the CIO Area are used as work bits in programming to control program execution. They
cannot be used for external I/O.
Work Area 8,192 bits (512 words): W00000 to W51115 (W000 to W511)
Controls the programs only. (I/O from external I/O terminals is not possible.)
Note: When using work bits in programming, use the bits in the Work Area first before using bits from
other areas.
Holding Area 8,192 bits (512 words): H00000 to H51115 (H000 to H511)
Holding bits are used to control the execution of the program, and maintain their ON/OFF status when
the PLC is turned OFF or theoperating mode is changed.
Note: The Function Block Holding Area words are allocated from H512 to H1535. These words can be used
only for the function block instance area (internally allocated variable area).
Auxiliary Area Read only: 7,168 bits (448 words): A00000 to A44715 (words A000 to A447)
Read/write: 8,192 bits (512 words): A44800 to A95915 (words A448 to A959)
Auxiliary bits are allocated specific functions.
Temporary Area 16 bits (TR0 to TR15)
Temporary bits are used to temporarily store the ON/OFF execution conditions at program branches.
Timer Area 4,096: T0000 to T4095 (used for timers only)
Counter Area 4,096: C0000 to C4095 (used for counters only)
DM Area 32 Kwords: D00000 to D32767
Used as a general-purpose data area for reading and writing data in word units (16 bits). Words in the DM
Area maintain their status when the PLC is turned OFF or the operating mode is changed.
Internal Special I/O Unit DM Area: D20000 to D29599 (100 words × 96 Units)
Used to set parameters for Special I/O Units.
CPU Bus Unit DM Area: D30000 to D31599 (100 words × 16 Units)
Used to set parameters for CPU Bus Units.
EM Area None
Index Registers IR0 to IR15
Store PLC memory addresses for indirect addressing. Index registers can be used independently in each
task. One register is 32 bits (2words).
Setting to use index registers either independently in each task or to share them between tasks.
Task Flag Area 32 (TK0000 to TK0031)
Task Flags are read-only flags that are ON when the corresponding cyclic task is executable and OFF
when the corresponding task is not executable or in standby status.
Trace Memory 4,000 words (trace data: 31 bits, 6 words)
File Memory Memory Cards: Compact flash memory cards can be used (MS-DOS format).
OMRON Memory Cards can be used.

Function Specifications

Item Specifications
Constant cycle time 1 to 32,000 ms (Unit: 1 ms)
Cycle time monitoring Possible (Unit stops operating if the cycle is too long): 10 to 40,000 ms (Unit: 10 ms)
I/O refreshing Cyclic refreshing, immediate refreshing, refreshing by IORF(097).
IORF(097) refreshes I/O bits allocated to Basic I/O Units and Special I/O Units.
The CPU BUS UNIT I/O REFRESH (DLNK(226)) instruction can be used to refresh bits allocated to CPU Bus
Units in the CIO and DM Areas whenever required.
Timing of special
refreshing for CPU
Bus Units
Data links for Controller Link Units and SYSMAC LINK Units, remote I/O for DeviceNet Units, and other
special refreshing for CPU Bus Units is performed at the following times:
I/O refresh period and when the CPU BUS UNIT I/O REFRESH (DLNK(226)) instruction is executed.
I/O memory holding
when changing
operating modes
Depends on the ON/OFF status of the IOM Hold Bit in the Auxiliary Area.
Load OFF All outputs on Output Units can be turned OFF when the CPU Unit is operating in RUN, MONITOR, or
Timer/Counter PV
refresh method
BCD or binary (CX-Programmer Ver. 3.0 or higher).
Input response time
Time constants can be set for inputs from Basic I/O Units. The time constant can be increased to reduce
the influence of noise and chattering or it can be decreased to detect shorter pulses on the inputs.
Mode setting at
Possible (By default, the CPU Unit will start in RUN mode if a Programming Console is not connected.)
Flash memory The user program and parameter area data (e.g., PLC Setup) are always backed up automatically in flash
memory. (automatic backup and restore.)
CPU Units with unit version 3.0 or later only:
When downloading projects from CX-Programmer Ver. 5.0 or higher, symbol table files (including CX-
Programmer symbol names, I/O comments), comment files (CX-Programmer rung comments, other
comments), and program index files (CX-Programmer section names, section comments, or program
comments) are stored in comment memory within the flash memory.
Memory Card
Automatically reading programs (autoboot) from
the Memory Card when the power is turned ON.
Program replacement during PLC operation Possible
Format in which data is stored in Memory Card User program: Program file format
PLC Setup and other parameters: Data file format
I/O memory: Data file format (binary format), text format,
or CSV format
Functions for which Memory Card read/write is
User program instructions, Programming Devices
(including CX-Programmer and Programming Consoles),
Host Link computers, AR Area control bits, easy backup
Filing Memory Card data and the EM (Extended Data Memory) Area can be handled as files.
Debugging Control set/reset, differential monitoring, data tracing (scheduled, each cycle, or when instruction is
executed), instruction error tracing, storing location generating error when a program error occurs.
Online editing When the CPU Unit is in MONITOR or PROGRAM mode, multiple program sections ("circuits") of the user
program can be edited together. This function is not supported for block programming areas.
(With the CX-Programmer is used, multiple program sections of the user program can be edited together.
When a Programming Console is used, the program can be edited in mnemonics only.)
Program protection Overwrite protection: Set using DIP switch.
Copy protection: Password set using CX-Programmer or Programming Consoles.
Error check User-defined errors (i.e., user can define fatal errors and non-fatal errors)
The FPD(269) instruction can be used to check the execution time and logic of each programming block.
FAL and FALS instructions can be used with the CJ1M CPU Units to simulate errors.
Error log Up to 20 errors are stored in the error log. Information includes the error code, error details, and the time
the error occurred.
A CJ1M CPU Unit can be set so that user-defined FAL errors are not stored in the error log.
Built-in peripheral port: Programming Device (including Programming Console) connections, Host Links, NT
Links Built-in RS-232C port: Programming Device (excluding Programming Console) connections, Host
Links, no-protocol communications, NT Links, Serial Gateway (Compoway/F master)
Serial Communications Unit (sold separately): Protocol macros, Host Links, NT Links, Modbus-RTU slave,
No-protocol, Serial Gateway (Compoway/F master, Modbus master)
Clock Provided on all models.
Ambient temperature Monthly error
55 ° C - 3.5 min to +0.5 min
25 ° C - 1.5 min to +1.5 min
0 ° C - 3 min to +1 min
Note: Used to store the time when power is turned ON and when errors occur.
Power OFF detection
AC Power Supply Unit: 10 to 25 ms (not fixed)
DC Power Supply Unit PD025: 2 to 5 ms; PD022: 2 to 10 ms
Power OFF detection
delay time
0 to 10 ms (user-defined, default: 0 ms)
Note: Not supported when the CJ1W-PD022 Power Supply Unit is mounted.
Memory protection Held Areas: Holding bits, contents of Data Memory and Extended Data Memory, and status of the counter
Completion Flags and present values.
Note: If the IOM Hold Bit in the Auxiliary Area is turned ON, and the PLC Setup is set to maintain the IOM
Hold Bit status when power to the PLC is turned ON, the contents of the CIO Area, the Work Area, part
of the Auxiliary Area, timer Completion Flag and PVs, Index Registers, and the Data Registers will be saved
for up to 20 days.
Sending commands to
a Host Link computer
FINS commands can be sent to a computer connected via the Host Link System by executing Network
Communications Instructions from the PLC.
Remote programming
and monitoring
Host Link communications can be used for remote programming and remote monitoring through a
Controller Link, Ethernet, DeviceNet, or SYSMAC LINK network.
across network levels
Remote programming and monitoring from Support Software and FINS message communications can be
performed across different network levels, even for different types of network.
Pre-Ver. 2.0: Three levels
Version 2.0 or later: Eight levels for Controller Link and Ethernet
networks (See note.), three levels for other networks.
Note: To communicate across eight levels, the CX-Integrator or the CX-Net in CX-Programmer version
4.0 or higher must be used to set the routing tables.
Storing comments in
CPU Unit
I/O comments can be stored as symbol table files in the Memory Card, EM file memory, or comment
memory (see note).
Note: Comment memory is supported for CX-Programmer version 5.0 or higher and CS/CJ-series CPU
Units with unit version 3.0 or later only.
Program check Program checks are performed at the beginning of operation for items such as no END instruction and
instruction errors.
CX-Programmer can also be used to check programs.
Control output signals RUN output: The internal contacts will turn ON (close) while the CPU Unit is operating (CJ1W-PA205R).
Battery life Battery Set for CJ1M CPU Units: CJ1W-BAT01
Self-diagnostics CPU errors (watchdog timer), I/O bus errors, memory errors, and battery errors.
Other functions Storage of number of times power has been interrupted.
(Stored in A514.)