ALR121-S01
PublishedSerial Communication Module
YokogawaControl Systems (PLC & DCS)Communication ModuleIndustrial supply
The Yokogawa ALR121-S01 provides two serial ports (RS-422 and RS-485) for Modbus communication, allowing a Modbus master to access Safety Control Station data. Half-duplex, start-stop synchronization.
Wholesale supplyALR121-S01
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Product identity6 fields
Item nameSerial Communication Module
Item number / codeALR121-S01
BrandYokogawa
Product lineIndustrial supply
CategoryControl Systems (PLC & DCS)
Product typeCommunication Module
Technical data12 rows
ALR121-S01module 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 (
Character Length8 bits (fixed on Modbus slave communication and subsystem communication functions)
Communication FunctionHalf-duplex
Communication FunctionsModbus slave communication function, subsystem communication function
Current Consumption0.5 A
Installation MethodMounted on S2SC70S, SSC60S, SSC50S, SSC57S, or SNB10D
InterfaceRS-422/RS-485 (4-wire system)
Lag Time After Data Transmission1 ms
Parity CheckNone/even/odd
Stop Bit Length1/2 bits (fixed to 1 bit for subsystem communication)
Synchronization MethodStart-stop synchronization
Transmission CodeBinary
Reference numbers1 public
YokogawaALR121-S01