The Omron CJ1W-SCU32, also cataloged as the CJ1W-SCU32 Serial High-Speed Communication Unit, operates as a dedicated hardware component for multi-protocol serial communication execution within SYSMAC CJ Series platforms.

Technical Identifier Matrix

• Base Hardware Model: CJ1W-SCU32
• Full Part Number: CJ1W-SCU32
• Product Type: Serial High-Speed Communication Unit
• Series Family: Omron SYSMAC CJ Series
• Unit Classification: CPU Bus Unit
• I/O Bus Architecture: CJ I/O Bus
• Total Port Count: 2 independent serial ports

Hardware Specifications

Omron Backplane Bus Velocity & Real-Time Logic Execution

The CJ1W-SCU32 operates as a CJ CPU Bus Unit, routing high-speed serial data blocks across the internal CJ I/O Bus interface directly into CPU memory. The dual serial channels execute Modbus Master/Slave commands and custom protocol macros independently of CPU cyclic ladder scans. Data throughput reaches speeds up to 230 kBit/s per port, maintaining communication determinism during heavy data exchange phases. Onboard flash memory maintains protocol execution tables and unit parameters across power cycles without requiring external backup battery power.

Package Contents & Ordering Information

• 1x Omron CJ1W-SCU32 Serial High-Speed Communication Unit
• 2x Serial port connector hardware shells
• 1x Technical instruction sheet

Field Installation Guidelines

• Rack Assembly: Slide the CJ1W-SCU32 onto the CJ Series CPU or expansion base rack until the backplane bus pins fully engage into the adjacent backplane socket.
• Serial Wiring: Terminate RS-422/485 communication lines using twisted-pair cables, ensuring correct signal line polarities (A/B) across all networked nodes.
• Cable Shielding: Terminate the outer braided cable shield 360 degrees to the metallic connector housing and connect it to panel earth ground.
• System Grounding: Connect the CPU power supply functional earth terminal to the main panel grounding bus with an electrical resistance under 100 Ohms.

Frequently Asked Questions

• Is hot-swapping permitted for the CJ1W-SCU32 on the CJ I/O bus?

  No. Internal system power must be isolated before inserting or removing the unit from the backplane rack assembly.

• What maximum current does the unit draw from the 5 VDC internal power rail?

  The CJ1W-SCU32 draws a maximum current consumption of 280 mA at 5 VDC from the backplane supply.

• What maximum baud rate is supported across the serial communication ports?

  Both communication channels support data transmission rates up to a maximum limit of 230 kBit/s.

• What serial protocols can be executed natively on the CJ1W-SCU32?

  The module natively executes Modbus-RTU Master/Slave, Protocol Macro, Serial Gateway, and No-protocol ASCII formats.

• What interface standard is utilized for physical port wiring?

  The unit incorporates 2 serial ports utilizing the RS-422/485 differential physical signal standard.

• How does the unit preserve protocol configuration settings during power loss?

  Configuration tables and user protocol macros are stored in non-volatile onboard flash memory.

• What cable shielding procedure must be implemented for RS-422 signal lines?

  Signal lines require continuous 360-deg braid shielding bonded directly to the enclosure protective earth ground.

• What functional earth ground resistance boundary applies to the rack installation?

  The central earth ground connection must maintain a ground loop resistance strictly under 100 Ohms.