OMRON CJ Series PLC Practical Guide

CJ1M-CPU22 has 10K steps, 2 channels, 100kHz, and 2 channels, none

CJ1M-CPU21 has 5K steps, 2 channels, 100kHz, and 1 channel, none

CJ1M-CPU13 without 20K steps -1

CJ1M-CPU12 without 10K steps - none

CJ1M-CPU11 without 5K steps - none

Built in I/O function:

10 point input (IN0~IN9), adjustable input time constant (0~32ms)

6-point transistor output (OUT0~OUT5)

4-point interrupt input (IN0~IN3), response time 0.3ms

2-channel high-speed counter (differential phase 30/50kHz, single-phase 60/100kHz)

2-channel 100kHz pulse output (supports CW/CCW or pulse+direction)

2-channel PWM output (CJ1M-CPU21 only has 1 channel)

Fast response input (minimum pulse width of 30 μ s)

2.3 CJ1 CPU Unit (Economy Type)

Model I/O Points Program Capacity Data Memory Basic Instruction Time

CJ1G-CPU45 1280 60K steps 128K words 0.08 μ s

CJ1G-CPU44 1280 30K steps 64K words 0.08 μ s

Selection suggestion: When high-speed processing and rich communication functions are needed, choose CJ1H-R; When compact size and positioning/counting function are required, choose CJ1M (built-in I/O); Choose CJ1G for simple logic control and cost sensitivity.

System configuration and installation points

3.1 Rack Configuration

The CJ series does not require a base plate, and units are directly connected through side connectors. A CPU rack can accommodate up to 10 units (including power supply, CPU, and I/O units). Through the I/O control unit (CJ1W-IC101) and I/O interface unit (CJ1W-II101), up to 3 expansion racks can be connected (CJ1M only has 1). Each expansion rack can also have a maximum of 10 units.

Important: The terminal cover (CJ1W-TER01) must be installed on the far right side of the rack, otherwise an I/O bus error (A40114 ON, A404 displays 0E hex) may occur.

3.2 Selection of Power Supply Unit

Model Input Voltage 5V Output 24V Output Total Power Replacement Notice RUN Output

CJ1W-PA205R 100-240V AC 5.0A 0.8A 25W None

CJ1W-PA205C 100-240V AC 5.0A 0.8A 25W Yes No

CJ1W-PA202 100-240V AC 2.8A 0.4A 14W None None

CJ1W-PD025 24V DC 5.0A 0.8A 25W None None

CJ1W-PD022 24V DC 2.0A 0.4A 19.6W None None (Non insulated type)

Replacement notification function (CJ1W-PA205C): The 7-segment LED on the front panel displays the remaining lifespan (FUL → HLF → 1.5 → 1.0 → 0.5 → 0.0/A02). When the remaining lifespan is less than 6 months, the display alternates between "0.0" and "A02", and the alarm output (normally open contact) is disconnected. The TEST switch can temporarily test the alarm output.

Current consumption calculation: Calculate the total current of all units in the 5V and 24V groups, which must not exceed the power supply capacity. For example, the CPU unit is approximately 0.91~0.99A (5V), the 16 point input unit is approximately 0.08A, and the 32 point output unit is approximately 0.14A. The total power=5V total current x 5+24V total current x 24 ≤ the maximum power of the power supply.

3.3 DIN rail installation

All CJ units must be installed on DIN rails (direct screw installation is not supported). Use PFP series guide rails (50cm or 100cm) and fix both ends with end plates (PFP-M). When installing, first release the installation buckle on the back of the unit, insert the upper edge of the guide rail, and then press the lower edge of the unit to lock the buckle.

3.4 Extended Connection

The I/O control unit must be installed adjacent to the right side of the CPU unit. The I/O interface unit must be located immediately to the right of the power unit in the expansion rack. Use CS/CJ series I/O connection cables (CS1W-CN313/713/223/323/523/133, etc., length 0.3~12m), with a total cable length of no more than 12m. The connectors have directionality, and a "click" locking sound should be heard after insertion.

Practical experience of memory and I/O allocation

4.1 Overview of I/O Memory Region

Regional address range, size, and purpose

CIO area (I/O) CIO 0000~0079 80 word basic I/O unit allocation (expandable to CIO 0999)

Data Link Area CIO 1000~1199 200 Word Controller Link Data Link

CPU bus unit area CIO 1500~1899 400 words, 25 words per unit, a total of 16 units

Special I/O unit area CIO 2000~2959 960 words, 10 words per unit, a total of 96 units

Built in I/O area (CJ1M) CIO 2960~2961 2-word fixed allocation

Serial PLC link area CIO 3100~3189 90 word CJ1M dedicated

Fixed allocation of 600 words for CIO 3200~3799 in DeviceNet area

Internal I/O area CIO 1200~1499, 3800~6143 2644 word workspace

Workplace (W) W000~W511 512 word recommended priority workspace

Maintain zone (H) H000~H511 512 word power-off hold

Auxiliary Area (A) A000~A959 960 Word System Signs and Status

Timer area T0000~T4095 4096 timer completion flags and PVs

Counter area C0000~C4095 4096 counter completion flags and PVs

DM area D00000~D32767 32K character unit data

EM area (CJ1/CJ1H) E0_00000~EC_32767 maximum 13 × 32K word extended data memory

4.2 I/O allocation method

The CJ series offers two I/O allocation methods:

Automatic power on allocation (default): I/O words are allocated from left to right based on the actual installed units each time power is turned on. Adding or removing units can cause changes in I/O addresses, so it is important to pay attention to program adaptation.