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Part of the Omron CJ-Series PLCs series — see the full model table, lifecycle status and replacement parts.

Omron CJ2H-CPU66 — front face of the CJ2H CPU showing the LED status row (RUN, ERROR, INH, PRPHL), the RS-232C DB9 serial port, the USB mini-B programming port, the battery compartment at the lower left and the type label CJ2H-CPU66

Omron CJ2H-CPU66 — CJ2H CPU, 150K Steps, RS-232C

SKU: CJ2H-CPU66

USD 1200.00

Omron CJ2H-CPU66 CJ2H CPU, 150K-step program, 352K-word data memory, RS-232C + USB, 2560 I/O max. In stock.

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Product Overview

The Omron CJ2H-CPU66 is a high-performance CPU unit from the CJ2H modular PLC platform, manufactured by Omron Corporation. Hengyixin Automation stocks this controller in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports.

The CPU delivers 150 K steps of program capacity with 16 ns basic instruction execution and 100 us system overhead. Data memory totals 352 K words - 32 K words of DM plus 32 K words across 10 EM banks. Function block programming, structured text, and ladder are all supported. Built-in ports are RS-232C and USB for programming; the CPU does not have EtherNet/IP.

Up to three expansion racks host 40 expansion units and 2560 local I/O points. Power supply and CJ1W / CS1W expansion units are ordered separately; compatible supplies include CJ1W-PA202 14 W, CJ1W-PA205R 25 W, CJ1W-PD022 19.6 W, and CJ1W-PD025 25 W. The CJ2H-CPU66-EIP sibling adds EtherNet/IP on top of the same 150K-step program.

Key Features

  • CJ2H-series CPU, 150 K-step program, 352 K-word data memory (32 K DM + 32 K x 10 EM banks)
  • 16 ns basic instruction execution, 100 us system overhead, function block programming and structured text
  • Up to 40 expansion units across 3 racks, 2560 max local I/O points
  • RS-232C DB9 + USB programming ports (no EtherNet/IP on this CPU; use CJ2H-CPU66-EIP for Ethernet)
  • SKU: CJ2H-CPU66
  • Series: Omron CJ2H-series modular PLC CPU

Best-Fit Applications

  • Multi-rack packaging line where 150K steps hold recipes, alarm logs, and trend data for 8 to 10 machine stations
  • Retrofit of a CJ1G-CPU4xH panel where the CJ2H keeps the CJ1W I/O in place but adds FB/ST programming and faster scan
  • Mid-size process skid where the CJ2H-CPU66-EIP later adds EtherNet/IP for SCADA without changing the program

Buying Checklist

  • Pick the CJ2H-CPU66 for a 150K-step CJ2H CPU with RS-232C + USB on a serial-only architecture.
  • Pick the CJ2H-CPU66-EIP instead when the panel needs built-in EtherNet/IP on top of the same 150K-step program.
  • Pick the CJ2H-CPU64 instead when the program fits within 100K steps and the budget is tighter.

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series Omron CJ2H-series modular PLC CPU
Model / SKU CJ2H-CPU66
Program Capacity 150 K steps (600 K bytes)
Data Memory 32 K words DM + 32 K words x 10 EM banks = 352 K words
Logic Execution 16 ns basic instruction, 100 us system overhead
Built-In I/O 0 digital I/O (CPU only - I/O comes from CJ1W units)
Expansion Up to 40 expansion units, 3 expansion racks, 2560 max local I/O points
Programming Ports RS-232C DB9 male + USB (no EtherNet/IP on this CPU)
Function Blocks / Languages Ladder, structured text, function block programming
Compatible Supplies CJ1W-PA202 14 W, CJ1W-PA205R 25 W, CJ1W-PD022 19.6 W, CJ1W-PD025 25 W
Dimensions (W x H x D) 48.8 × 90 × 74.5 mm; 190 g

Manufacturer documentation

Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.

FAQ for CJ2H-CPU66

Does the CJ2H-CPU66 have built-in EtherNet/IP?
No. The CJ2H-CPU66 ships with RS-232C and USB ports only. For EtherNet/IP on the same 150K-step CPU, pick the CJ2H-CPU66-EIP. EtherNet/IP can also be added via a CJ1W-EIP21 unit on the same rack.
What power supply does the CJ2H-CPU66 need?
The CPU ships without a supply. Common matches are CJ1W-PA202 (100-240 VAC, 14 W) for small racks, CJ1W-PA205R (100-240 VAC, 25 W) for medium racks, CJ1W-PD022 (24 VDC, 19.6 W), and CJ1W-PD025 (24 VDC, 25 W).
What is the difference between CJ2H-CPU66 and CJ2H-CPU68-EIP?
The CPU66 has 150K-step program and serial-only ports. The CPU68-EIP raises the program to 400K steps and adds EtherNet/IP. Both are CJ2H high-performance CPUs and are program-compatible within the CJ2H series.
How much data memory does the CJ2H-CPU66 have?
352 K words total - 32 K words of DM plus 32 K words across 10 EM (extended memory) banks. Recipes, production counters, and alarm logs go into DM; large lookup tables and history go into EM.
How do I set up the CJ2H-CPU66 expansion rack?
Mount a CJ1W-IC101 I/O Control Unit on the right side of the CPU and a CJ1W-II101 I/O Interface Unit on each expansion rack, then connect them with a CS1W-CN223 (2 m) or CS1W-CN713 (70 cm) cable. Up to three racks are supported.

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