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Product Overview
The Yokogawa ALR121 Serial Communication Module is a high-performance module designed for field control stations (FCS) to establish serial communication with subsystems like FA-M3, YS series, and PLCs. It supports RS-422 and RS-485 interfaces and provides reliable, half-duplex, start-stop synchronized communication, making it suitable for industrial automation environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | ALR121 |
| Interface | RS-422 / RS-485 |
| Communication Method | Point-to-point (RS-422) / Multipoint (RS-485) |
| Transmission Speed | 1200–38400 bps (depending on subsystem) |
| Communication Function | Half-duplex, start-stop synchronization |
| Transmission Distance | Up to 1200 m |
| Dimensions | 126.7 × 32.8 × 130 mm |
| Weight | 0.3 kg |
| Power Consumption | 0.5 A |
| Mounting | ANB10, ANB11, ANR10, AFF50, AFV10, AFV30, AFV40 |
| Ports | 2 ports (same function per module) |
| Supported Protocols | FA-M3, Modbus, MELSEC-A, YS, SLC500, PLC-5 |
| Synchronization | Start-stop |
Applications
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Integration of FCS with FA-M3 PLC systems
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Communication with YS1000 and YS100 series controllers
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Modbus-compatible subsystem integration
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Data exchange with MELSEC-A series PLCs
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Connection to Rockwell SLC500 and PLC-5 systems
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Ideal for process automation and distributed control systems
Advantages
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Supports both RS-422 and RS-485 for flexible connections
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Long transmission distance up to 1200 m
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Dual-redundant operation capability for enhanced reliability
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Supports a wide range of industrial protocols
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Compact and lightweight design
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Easy installation on various Yokogawa node units
FAQs
Q1: What interfaces does the ALR121 support?
A1: The ALR121 supports RS-422 and RS-485 interfaces.
Q2: Can the ALR121 operate in a redundant configuration?
A2: Yes, it supports dual-redundant configurations for high reliability.
Q3: What is the maximum transmission distance?
A3: The maximum transmission distance is 1200 meters.
Q4: How many ports are available on the ALR121?
A4: It has two ports, both configured with the same communication function.
Q5: Which protocols are compatible with the ALR121?
A5: It supports FA-M3, Modbus, MELSEC-A, YS series, SLC500, and PLC-5 protocols.
Q6: What is the power consumption of the ALR121?
A6: The ALR121 consumes 0.5 A of current.
Q7: Which Yokogawa units can the ALR121 be installed on?
A7: It can be mounted on ANB10, ANB11, ANR10, AFF50, AFV10, AFV30, and AFV40.
Q8: What is the weight of the ALR121?
A8: The module weighs 0.3 kg.
Q9: What is the size of the ALR121?
A9: Its dimensions are 126.7 × 32.8 × 130 mm.
Q10: Does it support multipoint communication?
A10: Yes, it supports multipoint communication in RS-485 mode.
Recommended Related Models
| Model | Interface | Protocol Support | Dimensions (mm) | Weight |
|---|---|---|---|---|
| ALR111 | RS-232C | FA-M3, Modbus, etc. | 126.7 × 32.8 × 130 | 0.3 kg |
| ALE111 | Ethernet | Modbus TCP/IP | 126.7 × 32.8 × 130 | 0.3 kg |
| ALF111 | Fieldbus | FOUNDATION Fieldbus | 126.7 × 32.8 × 130 | 0.3 kg |
| ALP111 | Profibus | PROFIBUS DP | 126.7 × 32.8 × 130 | 0.3 kg |
| ALP121 | Profibus (redundant) | PROFIBUS DP | 126.7 × 32.8 × 130 | 0.3 kg |
| ALE121 | Ethernet (redundant) | Modbus TCP/IP | 126.7 × 32.8 × 130 | 0.3 kg |
Popular Yokogawa Models
| Model | Description | Dimensions (mm) | Weight |
|---|---|---|---|
| PW101 | Power Module | 126.7 × 32.8 × 130 | 0.3 kg |
| PW102 | Redundant Power Module | 126.7 × 32.8 × 130 | 0.3 kg |
| PW302-S4 | High Capacity Power Module | 126.7 × 32.8 × 130 | 0.3 kg |
| PW401 | Power Supply Module | 126.7 × 32.8 × 130 | 0.3 kg |
| PW402 | Power Supply Module | 126.7 × 32.8 × 130 | 0.3 kg |
| ALR121 | Serial Communication Module | 126.7 × 32.8 × 130 | 0.3 kg |
