OMRON CJ series CPU unit operation instructions

Product Overview

The official operating manual for OMRON SYSMAC CJ series (CJ1H-R, CJ1H, CJ1G, CJ1M) CPU units covers safety specifications, unit version management, hardware specifications, system configuration, installation and wiring, DIP switches, PLC settings, I/O allocation, memory areas, operating mechanisms, fault diagnosis, and maintenance processes. It clarifies the functional differences between different unit versions (Ver.2.0/3.0/4.0), compares the performance of CJ1H-R high-speed and standard models, and provides complete guidance from selection, wiring, programming to debugging and maintenance of CJ1M. It is compatible with CX Programmer programming software.

Unit Version Management

1. Version rules

Pre Ver. 2.0: Early No Version Identification

Ver.2.0: Task separate download and upload, password protection, level 8 network communication

Ver.3.0: Function Block FB, Serial Gateway, Annotation Flash, Free Run Timer

Ver.4.0: FB online editing, input/output variables, string support, ST/SFC programming

CJ1H-R: Starting version Ver.4.0, ultra fast computation

2. Version viewing

Body nameplate: The batch number is marked with Ver. × on the right side ×

Software: CX Programmer → PLC Information or Unit Manufacturing Information

Hardware core specifications

Model Series Basic Instruction Speed Program Capacity Maximum I/O Features

CJ1H-R (high-speed) 0.016 μ s 30K~250K steps 2560 point floating-point operation 0.24 μ s, 0.1ms interrupt

CJ1H/CJ1G 0.02~0.04 μ s 10K~60K steps 2560 point parallel processing, FB support

CJ1M 0.10 μ s 5K~20K steps 640 points built-in I/O, high-speed counting, pulse output

Key specifications

Power supply: 24V DC, power supply unit CJ1W-PA/PD series

Battery backup: 5 years (25 ℃), maintaining DM/EM/HR and clock

Processing modes: Normal mode, Peripheral priority, Parallel synchronous/asynchronous mode

Expansion: Up to 3 expansion racks, 40 units, CJ1M up to 1 expansion rack

Core functional differences

1. CJ1H-R high-speed enhancement

Basic instruction 0.016 μ s, special instruction 0.048 μ s

Floating point operation 0.24 μ s (about 30 times faster than regular type)

New instructions: SINQ/COSQ/TANQ/MOVF/FIORF

Scheduling interruption: starting from 0.1ms, response time of 40 μ s

2. CJ1M has built-in I/O function

Built in: 10 inputs and 6 outputs, 4-channel interruption, 2-channel high-speed counting (100kHz)

Pulse output: 2-axis 100kHz, supports origin search, trapezoidal/triangular control

PWM output: 2-point, adjustable duty cycle

Serial PLC Link: Up to 9 sets of links

3. Programs and Storage

Task: 32 cycle tasks+256 interrupt tasks

Memory: CIO, HR, DM (32K), EM (up to 13 groups), auxiliary area

Backup: Programs and parameters are automatically written to flash memory without the need for battery storage

Installation, wiring, and setup

1. DIP switch (8-bit)

PIN1: Program write protection (ON=prohibit writing)

PIN2: Automatically load program from memory card upon power on

PIN4: Use PLC Setup for peripheral port parameters

PIN5: RS-232C port automatic recognition

PIN8: Must be set to OFF

2. Key items for PLC setup

Minimum/maximum cycle time, interrupt priority, I/O refresh mode

Battery error handling, clock calibration, startup mode

Built in I/O input filtering and pulse output parameters

3. I/O allocation

Two methods: automatic power on allocation and user-defined I/O table

Support: Rack/slot header setting, up to 64 sets

Error detection: The I/O table does not match the actual unit and reports an error

Operation and Diagnosis

1. Status indicator light

RUN (green): Running normally

ERR/ALM (red): constantly on=fatal fault; Flashing=Warning

INH (Orange): Output disabled

BKUP (Orange): In flash backup (cannot be powered off)

PRPHL/COMM: In serial communication

2. Error handling

Self diagnosis: CPU, memory, battery, I/O bus

Error log: up to 20 entries, recording code, time, and details

Fatal error: Stop running, all outputs closed

Non fatal error: Continue running, alarm prompt

Safety and Maintenance

Safety regulations: DANGER/WARNING/CAUTION Level 3 warning

Mandatory requirements: external emergency stop, interlock, limit circuit

Maintenance: battery replacement, lens cleaning, periodic backup

Anti static: The plug-in unit needs to release static electricity

Key issues

Question 1: How does the CJ1H-R high-speed model improve compared to the regular CJ1H/CJ1G core?

answer:

Speed: Basic instruction 0.016 μ s, floating-point operation 0.24 μ s, significantly improving processing speed

Interrupt: Scheduling interrupts support intervals of 0.1ms, with a response time of 40 μ s

Instructions: Add high-speed trigonometric functions, floating-point moves, and dedicated I/O refresh instructions

Clock: Supports high-precision clock pulses of 0.1m/1mm/0.01s

Question 2: What motion control functions can CJ1M’s built-in I/O achieve?

answer:

High speed counting: 2-axis 100kHz, supporting phase difference, pulse+direction, and plus/minus pulse modes

Pulse output: 2-axis 100kHz, capable of positioning, speed control, and origin search

PWM output: 2-point, used for time proportional control of temperature, lighting, and power

Fast response input: capable of capturing 30 μ s narrow pulses without being affected by cycle time

Question 3: What problems can be caused by incompatible unit versions? How to avoid it?

answer:

Problem: Downloading high-level programs (such as FB and new instructions) to low-level CPUs will result in compilation errors, download failures, and runtime shutdowns

Avoidance methods:

Confirm the CPU unit version and match it with the corresponding CX Programmer version

Do not use features higher than the unit version (such as Ver.2.0 without FB)

Upgrade the software to a version that supports the unit version before uploading the program