OMRON SYSMAC CJ Series CJ2 CPU Unit Hardware

Positioning and Applicable Scope

Type: CJ2 CPU Unit Hardware User Manual (Reference W472-E1-162023 Revision)

Target audience: Electrical engineers, FA system design/installation/maintenance personnel

Applicable models:

CJ2H series: CJ2H-CPU6 □ – EIP, CJ2H-CPU6 □

CJ2M series: CJ2M-CPU3 □, CJ2M-CPU1 □

Core Performance Specifications

Project CJ2H CJ2M

Basic instruction speed 0.016 μ s 0.04 μ s

Program capacity 50K~400K steps 5K~60K steps

Data area DM 32K+EM 25 banks DM 32K+EM 4 banks

Maximum I/O points 2560 points 2560 points

Interrupt tasks start as fast as 17 μ s and start as fast as 31 μ s

EtherNet/IP built-in (some models) built-in (CPU 3 □)

Pulse I/O without up to 4 axes (module expansion)

System configuration rules

Rack structure

1 CPU rack+up to 3 expansion racks

Each rack can install a maximum of 10 units

The maximum number of system units is 40

Unit Type

Basic I/O Unit: Input/Output/Hybrid

Special I/O units: analog, temperature control, positioning

CPU bus unit: Ethernet DeviceNet、Controller Link

Expand Connection

I/O control unit and I/O interface unit need to be configured

The longest connecting cable is 12m

Hardware composition and interfaces

CPU unit panel

Indicator lights: RUN, ERR/ALM, INH, PRPHL, BKUP

Switch: DIP 8-bit switch, memory card switch

Interface: USB, RS-232C, EtherNet/IP (optional)

Expansion accessories

Pulse I/O module (CJ2M dedicated): up to 2 pieces, supporting 4-axis pulse

Serial port expansion board (CJ2M-CPU3 □): RS-32C/RS-422A/485

Memory card: 128/256/512MB, used for program backup

power unit

Model: CJ1W-PA205R/PD025, etc

Output: 5V 0.2~5A, 24V 0.4~0.8A

Protection: Overload, short circuit, overheating protection

Installation and wiring specifications

Installation requirements

Environmental temperature: 0~55 ℃, humidity 10%~90%

Installation method: DIN rail or panel installation

Heat dissipation: Leave enough space up and down, install vertically

Key points of wiring

Power supply: AC100~240V or DC24V, strictly distinguish between live/neutral/grounded wires

Grounding: Grounding resistance ≤ 100 Ω, GR and LG separated

Communication: USB up to 5m, Ethernet CAT5e up to 100m

I/O: Terminal torque specifications prohibit direct connection with bare wires

Software and Communication

support software

Core: CX One, CX Programmer

Function: Programming, debugging, monitoring, data tracking, I/O table configuration

connection method

USB: Plug and play, requires driver installation

RS-232C: baud rate 0.3~115.2kbps

EtherNet/IP：10/100Mbps， Support FINS and Tag data links

Tag Access

Support tag name direct access to variables without address mapping

Applicable models: CJ2H (Ver1.6+), CJ2M (Ver2.2+)

Maintenance and Backup

battery maintenance

Model: CJ1W-BAT01, with a lifespan of 5 years (25 ℃)

Replacement: Complete within 5 minutes of power outage

data backup

Simple backup: One click backup to storage card

Computer backup: using CX One full backup program+parameters+data

regular inspection

Terminal fastening, heat dissipation, grounding, and indicator light status

Fault diagnosis

Misclassification

Fatal error: CPU stopped, all outputs turned off

Non fatal error: Continue running, alarm prompt

Common Faults

Unit configuration error: I/O table does not match reality

Communication error: EtherNet/IP, serial port connection exception

Battery error: Data retention failure

Troubleshooting methods

Panel indicator light+7-segment code display

Error log+auxiliary area flag

​Key issues

Question 1: What are the core differences and selection criteria between CJ2H and CJ2M CPUs?

answer:

Performance: CJ2H instruction is faster and has a larger capacity, suitable for medium and large systems; CJ2M has high cost-effectiveness and is suitable for small/compact systems.

Function: CJ2H supports synchronous unit operation; CJ2M supports pulse I/O modules (up to 4 axes) and serial port expansion boards.

Network: Both high-end versions have built-in EtherNet/IP, CJ2M-CPU1 □ has no network port.

Selection: CJ2M needs to be selected for multi axis positioning; CJ2H is required for high-performance and multi unit expansion.

Question 2: How to use the simple backup function of the CJ2 CPU’s storage card? What are the precautions?

answer:

Usage: Set DIP switch SW7 to ON, press and hold the power button on the memory card for 3 seconds to start backup; The BKUP light stays on during backup, do not turn off the power.

Backup content: all data of programs, parameters, and I/O memory.

Notes:

Do not turn off the power during backup/recovery, otherwise the data will be damaged.

After recovery, it is necessary to power on again to switch the operating mode.

Prioritize the use of Omron dedicated memory cards to ensure compatibility.

Question 3: How to set up and quickly troubleshoot communication faults on the EtherNet/IP port of CJ2 CPU?

answer

Setting method: Set the unit number (0-F) and node number (01~FE) by rotating the switch; The default IP is 192.168.250 Node number.

Quick investigation:

Check the indicator light: If the MS/NS green light is constantly on, it is normal, and if the red light is faulty.

Look at the 7-segment code: displays the IP address and error code, such as d6 indicating a connection failure.

Check settings: Node numbers are not duplicated, network cables are normal, and IP network segments are consistent.

Software verification: CX integrator online search, testing FINS communication.