OVERVIEW

Official designation: Omron CJ1W-PRM21 (CJ1, Network Control Module)

Role/Application: PROFIBUS-DP master unit for CJ-series PLCs. Facilitates high-speed distributed I/O data exchange, supporting DP-V1 functionality and reducing host CPU load.

KEY SPECS SUMMARY

Power: 400 mA at 5 VDC

Interfaces / Ports: One PROFIBUS DP Master RS-485

Indicators: Refer to the latest manufacturer manual.

Operating Temp: 0 to 55 degrees C

Platform / Compatibility: Omron CJ1 series PLC

Limit: 125 slaves and 16 modules max per CJ PLC

Lifecycle: Commercialized

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum number of slave devices supported by the master unit?

A: The CJ1W-PRM21 supports connection to a maximum of 125 PROFIBUS DP slave units.

Wiring & Installation:

Q: Which communication cable type is required for the PROFIBUS DP connection?

A: Connection requires a standard RS-485 shielded cable for the galvanically isolated PROFIBUS DP port.

Troubleshooting & Compatibility:

Q: What software is necessary to configure the CJ1W-PRM21 module and network?

A: Configuration requires the dedicated CX-PROFIBUS configurator program, which uses FDT/DTM technology.

Replacement & Upgrades:

Q: Is this module compatible with newer Omron platforms like the NJ-series controllers?

A: Yes, the CJ1W-PRM21 has documented compatibility with NJ-series controllers via specific operation manuals.