Yokogawa ALR121-S01 ALR121 Serial Communication Module

Description

The Yokogawa ALR121-S01 module offers two serial communication ports, one for RS-422 and one for RS-485, enabling Modbus communication. This allows data in the Safety Control Station (SCS) to be accessed or modified by a Modbus master system, which operates independently from the SCS.

Specifications

• Interface:RS-422/RS-485 (4-wire system)
• Connection Method:
  • Point-to-point (RS-422)
  • 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 on Modbus slave communication and subsystem communication functions)
• Stop Bit Length:1/2 bits (fixed to 1 bit for subsystem communication)
• Parity Check:None/even/odd
• Lag Time After Data Transmission:1 ms
• Transmission Distance:
  • Maximum 15 m (RS-422)
  • Maximum 1200 m (RS-485)
• Installation Method:Mounted on S2SC70S, SSC60S, SSC50S, SSC57S, or SNB10D
• I/O Wiring:
  • D-sub-9-pin (female × 2 ports)
  • Clamped with terminal block’s M4 screws (5 poles × 2 ports)
• Communication Functions:Modbus slave communication function, subsystem communication function
• Current Consumption:0.5 A
• Weight:Approx. 0.34 kg

Features

• Supports both RS-422 and RS-485 communication
• Facilitates Modbus communication for seamless data exchange between SCS and Modbus master systems
• High transmission speeds and long transmission distances
• Reliable performance with multiple communication functions