OVERVIEW

Official designation: Omron CQM1-ARM21 (SYSMAC CQM1 Series, AS-Interface Master Unit)

Role/Application: This communication module functions as an AS-Interface master, controlling up to 31 slave devices and facilitating distributed input/output data exchange within a CQM1 PLC system.

KEY SPECS SUMMARY

AS-Interface Slaves: 31 slaves max per master

I/O Points: 248 max (124 in / 124 out)

Communications Cycle: 5.148 ms minimum

Max Transmission Distance: 100 m / 300 m with 2 repeaters

Power Consumption (5 VDC): 300 mA maximum

Power Consumption (30.5 VDC): 100 mA maximum (AS-Interface line)

Operating Temp: 0 to 55 degrees C

Compatibility: Omron CQM1 PLC system

Indicators: Unit status, Network status, Slave status

Lifecycle: Obsolete or discontinued

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum number of I/O points that the CQM1-ARM21 module can manage?

A: The module can manage up to 248 I/O points, configured as 124 inputs and 124 outputs.

Wiring & Installation:

Q: What is the maximum AS-Interface bus length supported by the master unit without repeaters?

A: The maximum transmission distance is 100 meters without the use of repeaters.

Troubleshooting & Compatibility:

Q: What are the three status displays built into the CQM1-ARM21 unit for diagnostic purposes?

A: The built-in status displays are for Unit status, Network status, and Slave status.

Replacement & Upgrades:

Q: What Omron PLC series are typically recommended as modern alternatives for the obsolete CQM1 system modules?

A: The Omron CJ1 or CJ2 series are generally suggested for current system upgrades.