Omron CJ1W-SCU41-V1 CJ Series Serial Communications Unit

Omron CJ1W‑SCU41‑V1 is a CPU Bus Unit for SYSMAC CJ‑series PLC systems. Provides two independent serial ports (RS‑232C and RS‑422A/485) for connecting external devices such as HMIs, barcode readers, serial printers, and third‑party instrumentation. Supports multiple serial protocols configurable per port: Protocol Macro, Host Link, NT Link, Serial Gateway, No‑protocol, and Modbus‑RTU Slave. DIN rail mounting.

Applications:

• Serial connection to HMIs, SCADA systems, and host computers

• Integration of barcode readers, serial printers, and weigh scales

• Data exchange with third‑party devices (inverters, temperature controllers)

• Legacy system upgrades requiring additional serial ports for CJ‑series PLCs

Core Specifications:

• Product type: CJ1 CPU Bus Unit (Serial Communications Unit)

• Number of ports: 2 (configurable per port)

• Interface 1: RS‑232C (maximum transmission distance 15 m)

• Interface 2: RS‑422A/485 (maximum transmission distance 500 m)

• Serial protocols: Protocol Macro, Host Link, NT Link (1:N mode), Serial Gateway, No‑protocol, Modbus‑RTU Slave, loopback test

• Transmission speed: 1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200 bps (default 9,600 bps)

• Number of connectable units: up to 32 (unit numbers 0 to 31)

• Simple Backup Function: backup of Protocol Macro data to CPU Unit Memory Card

• Interrupt notification function available

• Unit numbers allocated: 1

• Current consumption: 5 V DC, 0.38 A

• Dimensions (W × H × D): 31 mm × 90 mm × 65 mm

• Weight: approx. 110 g

• Operating temperature: 0 °C … 55 °C

• Certifications: UC1, N, L, CE

Advanced Specifications:

• Number of mountable units: up to 16 per CPU (including all other CPU Bus Units)

• Communications mode: half‑duplex (full‑duplex for slave‑initiated communications)

• Synchronous mode: start‑stop synchronization (asynchronous mode)

• Protocol Macro function: user‑defined communication sequences for custom protocols

• Serial Gateway function: CompoWay/F, Modbus‑RTU, Modbus‑ASCII, and Host Link protocol conversion

• Host Link: C‑mode and FINS commands

• No‑protocol mode: user‑defined data format for custom ASCII/binary transmission

• Supports Unit Ver. 1.3 or later for Modbus‑RTU slave mode

System Integration:

• This serial communications unit belongs to the Omron SYSMAC CJ series.

• Installs on CPU Rack or Expansion Rack via CJ I/O Bus.

• One unit number is allocated; occupies 25 words in the CPU Bus Unit CIO Area (constant data exchange) and 20 words in the CPU Bus Unit DM Area (10 words per serial port).

• Configuration performed in CX‑Programmer (I/O Table and Unit Setup).

Related Products:

• CJ1W‑SCU21‑V1 – Serial Communications Unit, 2× RS‑232C ports

• CS1W‑SCU41‑V1 – CS series equivalent serial communications unit

• CJ1W‑CIF11 – RS‑422A/485 adapter for serial port expansion

• CJ1W‑PA205R – Power supply unit for CJ‑series CPU rack