Product Overview
The Yokogawa ALR121‑S53 S1 is a serial communication module designed for integration within Yokogawa Safety Control Stations (SCS) and Field Control Station (FCS) platforms. It supports RS‑422 (point-to-point) and RS‑485 (multipoint) interfaces, enabling Modbus slave and subsystem communications with external devices such as PLCs and sequencers. Dual serial ports and support for dual-redundant configuration make it ideal for mission-critical automation systems.
Technical Specifications
| Item | Specification |
|---|---|
| Modell | ALR121‑S53 S1 |
| Module Type | Serial Communication Module |
| Interface | RS‑422 / RS‑485 (4-wire system) |
| Number von Ports | 2 |
| Communication Mode | Half-duplex |
| Synchronization Method | Start-stop synchronization |
| Supported Baud Rates | 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps |
| Transmission Code | Binary |
| Character Length | 8 bits |
| Parity | None, Even, Odd |
| Stop Bits | 1 or 2 |
| Lag Time Post Transmission | ≈ 1 ms |
| Communication Distance | RS‑422: up to ≈ 15 m; RS‑485: up to ≈ 1200 m |
| Communication Functions | Modbus Slave, Subsystem Communication |
| Redundancy | Dual-redundant configuration supported |
| Installation Platforms | Yokogawa SSC60, SSC50, SSC57, SSC10, SNB10D Stücks |
| Power Consumption | Approximately 0.5 A |
| Gewicht | 0.3 kg |
| Dimensions | 126.7 × 32.8 × 130 mm |
Industry Applications
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Enables Modbus Slave communication between Yokogawa SCS and external systems
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Facilitates subsystem communication (e.g. sequencers or PLCs)
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Supports fail-safe architectures in process and safety control environments
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Suitable for use in petrochemical, power generation, water treatment, and industrial automation facilities
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Ideal for long-distance serial communications in distributed installations
Key Advantages
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Dual RS-422/485 Ports allow flexible connectivity and redundancy
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Wide Baud Support accommodates diverse application protocols
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Robust Distance Support: up to 1200 m over RS‑485 networks
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Redundant Configuration Support for critical system reliability
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Compact and Lightweight (approx. 0.34 kg), easing rack-based installation
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Low Power Usage (~0.5 A) and no interference with safety loops.
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Seamless Integration with Yokogawa safety/control stations
Häufig gestellte Fragen (FAQ)
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What ports and protocol support does the ALR121‑S53 S1 provide?
RS‑422 and RS‑485 with Modbus Slave and subsystem communication support. -
Is it suitable for redundant configurations?
Yes, dual-module redundancy is supported. -
What are the maximum transmission distances?
RS‑422 up to ~15 m; RS‑485 up to ~1200 m total. -
Which controllers is this module compatible with?
Yokogawa SSC60, SSC50, SSC57, SSC10, and SNB10D Stücks. -
What baud rates are supported?
Ranges from 1,200 up to 38,400 bps. -
What is the device’s power consumption?
Approximately 0.5 A. -
How heavy is the module?
Approximately 0.3 kg. -
What are the exact dimensions?
126.7mm × 32.8mm × 130 mm. -
Which communication functions can it perform?
Modbus slave and subsystem communication. -
Does the module interfere with safety loops?
No; it is designed to avoid interference with safety control systems.
Related Modells
| Modell Number | Beschreibung |
|---|---|
| ALR111‑S50 S1 | RS‑232C serial communication module (single-channel) |
| ALR121‑S50 S1 | Standard ALR121 serial module version |
| ALE111‑S51 | Ethernet Communication Module |
| ALF111‑S01 | Foundation Fieldbus H1 Link Active Scheduler Module |
| ALD112‑S00 S1 | DeviceNet Communication Module |
| ALR121‑S53 S1 Dual | Dual-redundant variant |
Popular Yokogawa Modules
| Modell Number | Beschreibung |
|---|---|
| AAV141‑S00 | Analog Input Module (16-channel) |
| ADV561‑P00 | Digital Output Module |
| ALE111‑S51‑S1 | Ethernet Communication Module |
| ALF111‑S01 | Fieldbus Communication (LAS) Module |
| ALD112‑S00 S1 | DeviceNet Communication Module |
| AAI141‑S03 | High-precision Analog Input Module |
Unternehmensinformationen
E-mail: [email protected]
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Add: Alishan Building, 2 Lvling Rd, Bezirk Siming, Xiamen, Fujian, China, 361006
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