Product Short Description
Product Name: Yokogawa ALR121-S00 Serial Communication Module (for FIO, RS-422/RS-485, 2-Port)
Product Overview: The ALR121 is a serial communication module used by a Field Control Station (FCS) to perform serial communication with subsystems such as FA-M3. It mounts on field control units (AFV30□, AFV40□, AFV10□, AFF50□), ESB bus node units (ANB10□, ANB11□), or ER bus node unit (ANR10□). The “-S00” suffix indicates standard type, no explosion protection, basic type.
Description
Key Technical Specifications:
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Model: ALR121 (RS-422/RS-485 interface)
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Connection Method: Point-to-point (RS-422), Multipoint (RS-485)
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Communication Function: Half-duplex
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Synchronization: Start-stop synchronization
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Transmission Speed: 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps
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Transmission Code: ASCII / binary
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Character Length: 7 / 8 bits
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Stop Bit Length: 1 / 2 bits
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Parity Check: None / Even / Odd
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Lag Time after Data Transmission: 1 ms
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Transmission Distance: Maximum 1200 m (total extended length)
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I/O Wiring: 3-pair shielded cable, AKB161 or AKB162
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Wiring Connection: Clamped with terminal block’s M4 screws (5 poles × 2)
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Current Consumption: 0.5 A
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Weight: 0.3 kg
Supported Communication Functions: FA-M3 communication (DR), Modbus communication, and others selectable via system builder (both ports must use the same communication function).
Features:
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Long-distance RS-485 multipoint communication up to 1200 m
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Flexible protocol configuration (ASCII/binary, selectable framing)
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Direct interface to FA-M3 subsystems and Modbus networks
Applications: Serial data exchange between Yokogawa CENTUM FCS and third-party subsystems (FA-M3 PLCs, Modbus devices) in factory automation and process control.
Installation & Usage Notes: Mount on ANB10□, ANB11□, ANR10□, AFF50□, AFV10□, AFV30□, or AFV40□. Use 3-pair shielded cable (AKB161/AKB162). Both communication ports must be configured with identical communication functions. Applicable transmission speed depends on the communication function, subsystems, and connection method.
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