Omron CJ1W-PRM21 CJ1 Series PROFIBUS Master Unit

Description

Integrating PROFIBUS DP fieldbus networks into Omron PLCs is simplified with the CJ1W-PRM21 CPU Bus Unit. Designed for high-speed decentralized control, this module acts as a PROFIBUS DP-V1 Class 1 and Class 2 Master, enabling seamless data exchange between the host controller and decentralized field devices. This module mounts directly onto a CJ-series CPU Rack or Expansion Rack, and is also fully compatible with NJ-series Controller Units. Utilizing standard RS-485 physical layer communication with galvanic isolation, it ensures reliable signal integrity in challenging industrial environments.

Features

• Supports both PROFIBUS DP and DP-V1 protocols (Class 1 and Class 2 Master functionality).
• Configurable node address range from 0 to 125 using network configuration software.
• Physical interface features a galvanically isolated RS-485 port with a standard 9-pin sub-D female connector.
• Accommodates up to 16 master units per NJ-series controller system.
• Rotary switches on the front panel allow hardware assignment of CPU Bus Unit numbers from 0 to F Hex.

Applications

• Automated manufacturing and assembly lines.
• Process control and packaging systems.
• Water and wastewater management infrastructure.
• Integration of multi-vendor field devices into Sysmac CJ1/NJ control architectures.

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Turn off the system power supply before mounting or removing the CPU Bus Unit.
• Set the CPU Bus Unit number rotary switch to a unique value (0 to F Hex) before installation.
• Ensure the module is securely locked into position on the CPU Rack or Expansion Rack.
• Use only PROFIBUS-compliant shielded twisted-pair cables conforming to EN50170 Volume 2.
• Ensure termination resistors are correctly engaged at the physical endpoints of the PROFIBUS network segment.