First TwinCAT PLC Project on a Beckhoff IPC
Build and verify a first TwinCAT PLC project on a Beckhoff IPC. This checklist covers target selection, EtherCAT discovery, I/O mapping, safe activation, restart tests, and commissioning records.
Manufacturer: Omron
Product No.: CJ1M-CPU12
Country of origin:Japan
Product Type: PLC CPU Modules
Payment: T/T, Western Union
Weight: 2000g
Shipping port: Xiamen
Warranty: 12 months
Executing logical control in localized machinery setups, the Omron CJ1M-CPU12 CPU unit delivers high-speed, compact processing power for automated systems. This unit manages up to 320 local I/O points and coordinates up to 10 directly connected modules without the need for expansion racks. Engineered for precision and space-constrained enclosures, it features a logical instruction execution speed of 100 nanoseconds and integrates built-in serial and peripheral communications to streamline fieldbus networking and configuration.
| Specification Parameter | Value / Rating |
|---|---|
| Manufacturer | Omron |
| Model Number | CJ1M-CPU12 |
| Product Series | CJ-series CJ1M CPU Units |
| I/O Capacity | 320 Points max. |
| Expansion Rack Support | Not Supported (Local CPU Rack ONLY) |
| Max. Connectable Units | 10 Units |
| Program Capacity | 10 Ksteps |
| Data Memory Capacity | 32 Kwords (DM area only; no EM area) |
| LD Instruction Time | 100 ns (0.1 us) |
| MOV Instruction Time | 0.3 us |
| System Overhead Time | 0.5 ms |
| Built-in Ports | 1 Peripheral Port, 1 RS-232C Port |
| Subroutines / Jumps | 1,024 |
| Scheduled Interrupts | 2 |
| Option Card Support | CompactFlash Card (external slot) |
| Shipping Weight (Calculated) | 2.0 kg (including commercial protective packaging) |
| Connector / Port | Functional Assignment / Configuration |
|---|---|
| Peripheral Port | Connects to CJ-series programming console or CS1W-CN226/CN626 cables for CX-Programmer connectivity. |
| RS-232C Port | 9-pin D-sub interface used for Host Link (Sysmac Way), NT Link, No-protocol serial, or Modbus-RTU master/slave communications. |
| CF Card Slot | Accepts industrial CompactFlash memory cards for automated file transfers, program restoration, and system parameter logging. |
The CJ1M-CPU12 bridges the gap between the entry-level CJ1M-CPU11 (160 I/O) and the CJ1M-CPU13 (640 I/O). If upgrading from legacy CQM1 systems, note that the physical footprint, instruction address mappings, and communication cables are distinct. Additionally, unlike the larger CJ1M-CPU2x series, this processor lacks built-in pulse I/O or positioning outputs on the CPU board, meaning motion tasks require separate CJ1W-NC position control modules.
Because this CPU does not support expansion racks, users are strictly capped at 10 slots on the main CPU rack. When configuring the system, perform a comprehensive current consumption analysis. High-density output modules combined with network units can exceed the current rating of the power supply unit. In such setups, upgrade the power supply to the CJ1W-PA202 (AC) or CJ1W-PD022 (DC) to prevent system drops or communications faults.
Verify the physical status of the hardware configuration DIP switches behind the front cover flap prior to commissioning. Switch 5 determines the communication protocol of the built-in RS-232C port. Setting Switch 5 to ON forces toolbus default programming protocols, ignoring settings defined in CX-Programmer's PLC Setup. Conversely, setting Switch 5 to OFF activates the customized serial parameters written to system memory.
Hook the upper claw of the CJ1M-CPU12 unit onto the top of the DIN rail, then press the unit firmly downward until the bottom yellow locking track clip clicks into place.
Engage the integrated connectors on the sides of adjacent modules. Slide the yellow lock levers on both the top and bottom of the CJ1M unit forward until they click, locking the CPU and adjacent modules together.
Ensure the Functional Ground (FG) terminal on the adjacent power supply module is connected to a dedicated, low-impedance ground point (under 100 ohms) using AWG 14 or larger wire to minimize electrostatic interference.
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Returns & Warranty

Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
Japan
|