CJ1W-SRM21 High-Speed Serial Communications Unit for CJ1 PLCs

Product Overview

The CJ1W-SRM21 is a high-performance Serial Communications Unit from Omron's CJ1 series, engineered to seamlessly integrate with programmable logic controller (PLC) systems in industrial automation environments. This robust unit facilitates reliable serial communication between PLCs and a wide range of external devices, including barcode readers, printers, sensors, and other industrial equipment. With support for both RS-232C and RS-422A/485 interfaces, the CJ1W-SRM21 ensures flexible connectivity options for diverse automation applications.

Key Features

• Dual Interface Support: Equipped with both RS-232C and RS-422A/485 ports for maximum compatibility with industrial devices.
• Versatile Protocol Support: Compatible with multiple communication protocols including Host Link, NT Link, 1:1 PLC Link, Toolbus, and Serial Gateway functionality.
• Wide Baud Rate Range: Adjustable from 300 to 115,200 bps to accommodate various communication speed requirements.
• Configurable Data Format: Supports 7 or 8 data bits, 1 or 2 stop bits, and None/Even/Odd parity settings for precise communication setup.
• Compact Design: Space-saving dimensions of 31 mm (W) × 90 mm (H) × 65 mm (D) with a lightweight 200 g construction.
• Efficient Power Consumption: Operates on 5 V DC with 0.3 A current draw, powered directly through the PLC backplane.
• Rugged Construction: Designed for industrial environments with an operating temperature range of 0°C to 55°C and storage capability from -25°C to 65°C.
• Humidity Resistant: Operates reliably in environments with 10% to 90% relative humidity (non-condensing).
• Manufacturer Warranty: Backed by Omron's standard 1-year warranty for guaranteed performance and reliability.

Industrial Applications

The CJ1W-SRM21 Serial Communications Unit is ideal for numerous industrial automation scenarios:

• Data Acquisition Systems: Facilitates seamless data transfer between PLCs and external data logging devices.
• Inventory Management: Enables integration with barcode scanners for real-time tracking and inventory control.
• Industrial Printing: Connects with label printers for automated product identification and tracking.
• Remote Monitoring: Supports serial network communication for distributed control systems.
• Process Automation: Interfaces with various sensors and measurement devices for precise control applications.
• Equipment Integration: Allows communication between PLCs and specialized industrial machinery.

Technical Specifications

Parameter	Specification
Model Number	CJ1W-SRM21 (Omron genuine part)
Communication Interfaces	RS-232C (D-Sub 9-pin), RS-422A/485 (terminal block)
Supported Protocols	Host Link, NT Link, 1:1 PLC Link, Toolbus, Serial Gateway
Baud Rate Range	300, 600, 1,200, 2,400, 4,800, 9,600, 19,200, 38,400, 57,600, 115,200 bps
Data Bit Configuration	7 bits or 8 bits selectable
Stop Bit Options	1 bit or 2 bits configurable
Parity Settings	None, Even, or Odd parity available
Physical Dimensions	31 mm (W) × 90 mm (H) × 65 mm (D)
Unit Weight	Approximately 200 grams
Power Requirements	5 V DC ±5%, 0.3 A (supplied via CJ1 backplane)
Operating Conditions	0°C to 55°C, 10% to 90% RH (non-condensing)
Storage Conditions	-25°C to 65°C, 10% to 90% RH (non-condensing)
Vibration Resistance	10 to 57 Hz, 0.075 mm amplitude, 57 to 150 Hz, 9.8 m/s² acceleration
Shock Resistance	147 m/s², 3 times each in 6 directions
Warranty Period	1 year manufacturer warranty

Installation and Compatibility

The CJ1W-SRM21 is designed for direct installation in CJ1 series PLC systems. It occupies one slot in the CJ1 CPU Rack or Expansion Rack. The unit is compatible with all CJ1 series CPUs and can be used alongside other CJ1 series I/O and special units. Configuration is performed through the PLC programming software, allowing for easy setup of communication parameters and protocols.