Omron CJ1W-PRM21 CJ Series PROFIBUS-DP Master Unit

Omron CJ1W-PRM21 is a PROFIBUS-DP master unit (Class 1) for SYSMAC CJ-series PLC systems. Supports DP-V1 data types and PROFIBUS-DP cyclic/acyclic communication. Integrates up to 125 PROFIBUS slaves into CJ-series CPU racks or expansion racks. DIN rail mounting.

Applications:

• Factory automation and distributed control systems

• Multi‑vendor device networking (drives, HMIs, I/O blocks)

• Process control and equipment networking

• Legacy system upgrades requiring PROFIBUS‑DP connectivity

Core Specifications:

• Network type: PROFIBUS-DP (Class 1 master)

• Transmission speed: 9.6 kbps … 12 Mbps (all standard baud rates)

• Transmission distance: up to 1,200 m (depending on baud rate)

• Number of PROFIBUS slaves: 125 max.

• I/O data capacity per slave: 244 bytes in / 244 bytes out

• Total I/O data capacity: 7,168 words

• Unit classification: CJ‑series CPU Bus Unit

• Unit number: 0–15 (rotary switch)

• Max. units per PLC: up to 16 (depends on CPU type)

• Configurator: CX-ConfiguratorFDT (with generic DTM for GSD‑file based slaves)

• Address range: 0–125 (set via configurator)

• Global Control services: Sync, Unsync, Freeze, Unfreeze, Clear

• Master‑Slave services: Data_Exchange, Slave_Diag, Set_PRM, Chk_Cfg, Global_Control

• Power consumption: 400 mA max. at 5 V DC (from backplane)

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

• Weight: approx. 100 g

• Operating temperature: 0 °C … 50 °C

Advanced Specifications:

• Communication port: 1 × RS‑485, 9‑pin female D‑sub

• Physical layer: shielded twisted‑pair cable

• Error logging: internal error memory (volatile)

• Status indicators: front‑panel LEDs for diagnostics

• Software support: CX-ConfiguratorFDT for network configuration and diagnostics

• Certification: UC1, CE

System Integration:

• This CPU Bus Unit belongs to the Omron SYSMAC CJ series.

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

• PROFIBUS address and network parameters are configured using CX-ConfiguratorFDT.

• The unit supports both cyclic data exchange and acyclic messaging (DP‑V1).

Related Products:

• CJ1W‑PRT21 – PROFIBUS-DP slave unit for CJ‑series

• CS1W‑PRM21 – PROFIBUS-DP master unit for CS‑series (higher I/O capacity)

• CX-ConfiguratorFDT – configuration software for PROFIBUS networks