Omron CJ2M-CPU33 PLC CPU Module

The Omron CJ2M-CPU33 is a high‑performance CPU unit for the CJ2M series modular PLCs. It offers 60K steps of user program memory, built‑in Ethernet (EtherNet/IP), and USB programming port. The CPU supports up to 2560 local I/O points and 4 axes of motion control via pulse outputs. It is suitable for mid‑sized machines requiring fast processing and network connectivity.

CPU Performance

Processor: 32‑bit RISC, 200 MHz. Basic instruction speed: 0.04 µs (LD). Program memory: 60K steps (flash, no battery needed). Data memory: 32K words (D registers), 32K words retentive (battery optional). The CJ2M-CPU33 includes a real‑time clock (RTC) with 5‑day backup capacitor.

Built‑in Communication

• Ethernet port (RJ45): 10/100Base‑T, supports EtherNet/IP (tag data link), socket service, FTP server, and Modbus TCP.

• USB 2.0 (mini‑B): programming and monitoring (12 Mbps).

• Peripheral port (6‑pin): for connection to Omron HMIs or legacy programming consoles.

Motion Control

The CPU integrates 4 pulse outputs (100 kHz each) for stepper or servo control (open loop). It also has 4 high‑speed counters (100 kHz) for encoder feedback. Motion instructions include positioning, interpolation, and speed control. The CJ2M-CPU33 can also control up to 64 axes via EtherCAT when using a CJ2M‑MD211 motion control unit.

I/O and Expansion

The CPU mounts on a CJ2 CPU rack and supports up to 40 CJ series I/O units (digital, analog, temperature, special). Maximum local I/O: 2560 points (with expansion racks via CJ1W‑BI series). The CPU also supports remote I/O via EtherNet/IP (up to 64 nodes).

Battery and Memory Protection

A lithium battery (CJ1W‑BAT01) retains retentive data for 5 years. The CPU also includes flash memory for backup of user program and parameter area. Battery low is indicated by an LED and a system flag.

Diagnostics and LEDs

Status LEDs: RUN (green), ERR/ALM (red), COMM (yellow), and INH (yellow). The CPU stores up to 100 error events in a buffer (time stamped). A 2‑digit 7‑segment display shows error codes (e.g., A10 = memory error). Watchdog timer (WDT) adjustable from 0.1 to 1000 ms.

Power and Environment

Supply voltage: 24V DC (20.4–28.8V) via backplane from power supply unit (e.g., CJ2W‑PA205). CPU consumption: 0.5A at 5V. Dimensions: 90 mm height x 60 mm width x 85 mm depth. Weight: 0.3 kg. Operating temperature: 0 to 55°C; storage: -20 to 75°C. Humidity: 10% to 90% non-condensing. Vibration: 2 g (10–55 Hz).

Programming Software

CX‑Programmer (version 9.5 or higher) or Sysmac Studio. Languages: ladder diagram, structured text, and sequential function chart (SFC). The CPU supports function blocks and structured data types. Online editing and forced I/O are allowed.

Typical Applications

Packaging machinery, labeling systems, assembly stations, and small to medium conveyor systems. The built‑in Ethernet simplifies connection to HMIs and SCADA.

Ordering and Documentation

Omron order number: CJ2M-CPU33. Includes an end cover (CJ2W‑END) and a programming cable (USB). Manual: CJ2M CPU Unit Hardware Manual (W501-E1-06).