OMRON

Basic Positioning

It is the CPU host unit of the small-sized modular PLC of the OMRON CJ1M series, belonging to the core processor of the Sysmac CJ1 series compact programmable logic controller. It comes with built-in high-speed pulse output and is specifically used for small equipment, multi-axis servo motion control, and is perfectly compatible with the servo driver R88D-WN08H-ML2 in your previous picture. It is designed for precise positioning control of single/double-axis servo.
II. Core Function (What is PLC CPU)
PLC CPU is the control brain of the entire automated equipment, responsible for the logical operations, motion positioning, signal acquisition, and communication interaction of the entire equipment:
Reading digital/analog input signals such as photoelectric, limit switches, buttons, etc.;
Running control programs such as ladder diagrams and structured text, automatically determining the equipment operation flow;
Outputting switch signals to control solenoid valves, indicator lights; It comes with a high-speed pulse interface to directly drive servo/stepper motors for precise positioning;
Linking servo, touch screen, frequency converter, other PLCs through buses (MECHATROLINK-II, DeviceNet, EtherNet/IP, etc.);
Fault alarm, data recording, parameter reading and writing, human-machine interaction communication.
Model Segmentation Interpretation
CJ1M: OMRON CJ series compact modular PLC sub-series, focusing on motion control of small equipment;
CPU: CPU processor unit;
22: Model specification code, representing 32K program capacity, built-in 10 input 6 output I/O, 2 high-speed pulses + 2 PWM outputs, mainly for single/double-axis servo positioning control.
III. Hardware Interfaces and Structural Details (Parts in the picture)

1. Built-in I/O terminal on the right (the black pin socket on the far right)
   Integrated 10-point input, 6-point output, without the need for additional I/O modules to perform simple equipment control:
   Input (IN 10 points): connected to proximity switches, travel limit switches, start/stop buttons, sensors;
   Output (OUT 6 points): 2 high-speed pulses, 2 PWM pulses (drive servo/stepper positioning), 2 ordinary transistor outputs (control solenoid valves, indicator lights).
   Key point: 2 high-speed pulses can directly send pulse control for servo, paired with your previous R88D-WN series servo; If multi-axis synchronization is needed, an MECHATROLINK-II motion control module CJ1W-MCH71 can be added for bus control servo.
2. Front communication interface (from top to bottom)
   Peripheral port (Peripheral RS232 port, square port)
   Connects to computer CX-One programming software, handheld programmer, downloads/upload programs, online monitoring and debugging; can also communicate with touch screens, serial ports of upper computers.
   RS232C serial port (9-pin DB9)
   Independent serial port, can freely connect to human-machine interface HMI, frequency converter, barcode scanner, upper industrial control computer, for custom serial port communication.
   Dip switch: set station number, communication protocol, peripheral port mode switching.
3. Front cover (the black cover in the picture is opened)
   Internal slots are used for installing memory cards (memory cards), functions:
   Backup/restore PLC program, equipment parameters;
   Batch copy programs when mass-producing equipment, quickly copy to multiple PLC of the same model;
   Store production operation data, fault records.
4. Left card slot
   PLC backplane expansion interface, can be inserted into the CJ series CPU base plate, freely expand various modules:
   Digital I/O module (CJ1W-ID/OC series); Analog module (temperature and pressure acquisition);
   Motion control module (MECHATROLINK-II bus module CJ1W-MCH71, compatible with your 750W servo);
   Communication module (Ethernet, DeviceNet, RS485, etc.).
5. Yellow top snap
   DIN rail installation lock, the entire PLC is directly clamped onto the standard 35mm rail of the electrical cabinet; it comes with an internal lithium battery, which can save programs and register data in case of power failure.
   Four. Key hardware specifications of CJ1M-CPU22
   Program memory: 32K step program capacity, sufficient for complex logic + motion control of small and medium-sized equipment;
   Built-in I/O: 10 points of DC24V input, 6 points of transistor output;
   Motion function: Built-in 2-axis high-speed pulse output (up to 100kHz), supports origin return, relative/absolute positioning, speed control; 2 channels of PWM pulse output;
   Communication capability: Standard peripheral ports + independent RS232, expansion modules can realize MECHATROLINK-II motion bus, Ethernet, DeviceNet;
   Programming language: Ladder diagram LD, sequential function chart SFC, structured text ST, mnemonic, compatible with Omron CX-Programmer programming software;
   Installation method: DIN rail installation, working temperature 0~55℃ industrial electrical control cabinet environment;
   Servo matching accessories:
   Simple control: Built-in pulse output directly drives R88D-WN servo;
   Multi-axis high-precision synchronization: Add CJ1W-MCH71 bus module, use MECHATROLINK-II bus to control multiple R88D-WN08H-ML2 servos.
   Five. Typical application scenarios (matching servo equipment with you)
   This CPU is the mainstream controller for small and medium-sized automation equipment, perfectly compatible with 750W servo in the industry:
   Packaging equipment: labeling machine, cutting machine, filling positioning axis, sealing machine;
   Electronic processing equipment: automatic screw locking machine, PCB board splitting machine, soldering machine, dispensing machine;
   Handling and transplanting equipment: single/double-axis linear module, small mechanical hand, material transplant platform;
   Small machine tools: CNC drilling, indexing fixture, small engraving machine;
   Textile film equipment: tension control for winding and unwinding, deviation correction mechanism;
   Assembly line equipment: precise conveying positioning, automatic cycle of workholding fixtures.
   Six. Supplementary notes
   Series upgrade: CJ1M is the classic old model PLC, the current new replacement model is CP1E, NJ/NX series; a large number of existing equipment use CJ1M-CPU22 as spare parts;
   Matching relationship: The R88D-WN08H-ML2 servo driver in your previous picture, and CJ1M-CPU22 are the original factory standard matching: single axis uses pulse control, 2 axes and above use MECHATROLINK-II bus module;
   Advantages of use: CPU comes with pulse output, no additional positioning module is needed, equipment cost is lower; modular expansion is flexible, later IO, communication, multi-axis bus can be added; program is stable and resistant to interference, suitable for harsh industrial environments in factories.
6. For more models, please contact via email: plcvarious@foxmail.com