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Part of the Omron CK3M / CK3W Axis & I/O Units series — see the full model table, lifecycle status and replacement parts.

Omron CK3M-CPU121 — front face of the CK3M-series motion controller showing the green PWR and RUN status LEDs at the top, the orange ERR LED, the CK3M-CPU121 type label, the USB 2.0 host Type A port under the cover and the EtherCAT and EtherNet/IP port LEDs on the lower face

Omron CK3M-CPU121 — CK3M CPU, 8 EtherCAT Axes

SKU: CK3M-CPU121

USD 1743.00

Omron CK3M-CPU121 programmable multi-axis motion controller, 1 GB RAM, 8 EtherCAT axes, expandable to 16. In stock, China shipping.

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Product Overview

The Omron CK3M-CPU121 is a CK3M-series programmable multi-axis motion controller CPU, 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.

It runs up to 8 EtherCAT synchronous servo axes from a dual-core 1 GHz CPU with 1 GB RAM and 1 GB flash (2 GB on firmware rev 2.8 and later). Adding up to 4 CK3W-AX axis interface units expands local axis control to 16 axes. The built-in EtherCAT port runs at 250 us min communications cycle with DC sync for Accurax G5 and 1S servo drives.

Programming is in Sysmac Studio (G-code, ANSI C, and PMAC Script languages). Optional Power PMAC-NC SDK targets CNC machines with HMI customisation. The CPU draws 24 VDC at 20.4 to 26.4 V from a CK3W-PD048 power supply. The 4-axis sibling is the CK3M-CPU111; the no-EtherCAT sibling is the CK3M-CPU101; the 16-axis CK5M upgrade is the CK5M-CPU131 with 1.6 GHz quad-core CPU.

Key Features

  • CK3M-series programmable multi-axis motion controller CPU, dual-core 1 GHz, 1 GB RAM, 1 GB / 2 GB flash
  • Built-in EtherCAT master with DC sync for 8 synchronous servo axes, 250 us minimum communications cycle
  • Up to 16 local axes via 4 CK3W-AX axis interface units (DirectPWM / analog output / stepper pulse)
  • Open protocols MQTT publisher / subscriber, OPC-UA server, EtherNet/IP adapter, Modbus TCP client / server
  • SKU: CK3M-CPU121
  • Series: Omron CK3M-series programmable multi-axis motion controller
  • Voltage: 24 VDC
  • I/O: 2 I/O

Best-Fit Applications

  • Precision laser-cutting controller on a sheet-metal cell where the CK3M-CPU121 runs 8 EtherCAT servo axes and one CK3W-AX1515N 4-axis analog interface for the galvo scanner
  • CNC retrofit on a small machining centre where the CK3M-CPU121 replaces a legacy controller and Power PMAC-NC SDK runs the G-code interpreter over 8 axes
  • Spare replacement on a packaging line where the previous CK3M-CPU111 (4 axes) is swapped for the CK3M-CPU121 to add 4 more axes for one infeed

Buying Checklist

  • Pick the CK3M-CPU121 for an 8-EtherCAT-axis CK3M motion controller with a CK3W-AX expansion path to 16 axes.
  • Pick the CK3M-CPU111 instead when the cell only needs 4 EtherCAT axes on the same dual-core 1 GHz CK3M platform.
  • Pick the CK3M-CPU101 instead when the cabinet drives local axes only via CK3W-AX units and does not need an EtherCAT master.

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series Omron CK3M-series programmable multi-axis motion controller
Model / SKU CK3M-CPU121
CPU / Memory Dual-core 1 GHz, 1 GB RAM, 1 GB built-in flash (firmware rev 2.8 and later: 2 GB flash)
EtherCAT 1 EtherCAT port (RJ45, 100BASE-TX), DC sync, 250 us minimum cycle, max 32 slaves, node addresses 1 to 32
Maximum Axes 8 EtherCAT synchronous axes, expandable to 16 axes total via up to 4 CK3W-AX axis interface units (4 axes each)
Axis Interface Units CK3W-AX1313N / P (DirectPWM), CK3W-AX1414N / P (filtered PWM), CK3W-AX1515N / P (true DAC), CK3W-AX2323N / P (sinusoidal)
Ethernet 1 EtherNet/IP port (10/100 Mbps, RJ45), EtherNet/IP tag data links 32 connections, RPI 1 to 1000 ms, 3200 pps per Unit
USB / I/O USB 2.0 host Type A for external memory, optional CK3W-MD7110 (16-in / 16-out NPN) or CK3W-MD7120 (PNP) digital I/O
Programming Sysmac Studio (free download, G-code / ANSI C / PMAC Script), optional Power PMAC-NC SDK for CNC HMI customisation
Power Supply 24 VDC at 20.4 to 26.4 V from a CK3W-PD048 PSU (5 VDC / 24 VDC, 5 V 23 W, 24 V 55 W)
Environment / Weight 0 to 55 C operating, 10 to 95 percent humidity (no icing / condensation), 90 (H) x 63.2 (W) x 80 (D) mm, 230 g, DIN-rail mount, cULus / EN 61326 / RCM / KC listed

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 CK3M-CPU121

What is the Omron CK3M-CPU121 used for?
It is the CK3M-series programmable multi-axis motion controller CPU with a dual-core 1 GHz processor, 1 GB RAM, 1 GB flash, and a built-in EtherCAT master for 8 synchronous servo axes. Typical uses are precision laser cutting, CNC retrofits, semiconductor motion platforms, and high-axis-count packaging machines. Programming is in Sysmac Studio using G-code, ANSI C, or PMAC Script languages.
CK3M-CPU121 vs CK3M-CPU111 - what is the difference?
Both share the same dual-core 1 GHz CPU, 1 GB RAM, EtherNet/IP port, USB port, and Sysmac Studio support. The -121 is the 8-EtherCAT-axis variant; the -111 is the 4-EtherCAT-axis variant. Pick the -121 for 5 to 8 EtherCAT axes on a typical machine; pick the -111 when 4 axes are enough on the same CK3M body.
What software does the CK3M-CPU121 run?
Sysmac Studio (free download from OMRON) with G-code, ANSI C, and PMAC Script languages. The IDE handles configuration, programming, and debugging. For CNC machines with custom HMI, the optional Power PMAC-NC SDK and Power PMAC-NC Runtime add G-code interpreter and HMI extension support. Project transfer is via USB memory or Ethernet.
Can the CK3M-CPU121 drive local servo axes without EtherCAT?
Yes. The CK3M-CPU121 accepts up to 4 CK3W-AX axis interface units, each of which adds 4 local axes controlled by analog output (CK3W-AX1414 / 1515), DirectPWM (CK3W-AX1313), or stepper pulse output. The total axis limit is 16 local + 8 EtherCAT, with up to 24 synchronous axes. Each CK3W-AX unit is powered from the CK3W-PD048 PSU and connects to the CPU via the side expansion connector.

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