The Yokogawa ALR121-S50 is a specialized serial communication module for industrial applications, particularly in safety control systems. It provides a reliable and efficient means to connect various devices and systems within a network. This module works with Yokogawa’s safety control stations (SCS) to enable Modbus communication.

Key Features and Specifications

• Interface: RS-422/RS-485 (4-wire system)
• Connection Method: Point-to-point (RS-422) and Multipoint (RS-485)
• Communication Function: Half-duplex
• Synchronization Method: Start-stop synchronization
• Transmission Speed: 1200/2400/4800/9600/19200/38400 bps
• Transmission Code: Binary
• Character Length: 8 bits (fixed)
• Stop Bit Length: 1 bit (fixed)
• Parity Check: None/even/odd
• Compatibility: Compatible with Yokogawa’s SSC60□, SSC50□, SSC10□ safety control units, and SNB10D safety node unit.

Applications

• Modbus Communication: Facilitates Modbus communication between the safety control station and other devices.
• Subsystem Communication: Enables communication with subsystems such as sequencers.
• Data Transmission: Transmits data between connected devices, including process parameters and control commands.
• Industrial Automation: Used in various industrial automation applications requiring reliable serial communication.

Benefits

• Reliability: Operates well in harsh industrial environments.
• Flexibility: Supports both point-to-point and multipoint connections.
• Compatibility: Works with a wide range of Yokogawa safety control systems.
• Ease of Use: Simple configuration and integration into existing systems.
• Safety: Enhances system safety by providing reliable communication for safety-critical applications.