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Yokogawa ALR121-S01 ProSafe-RS Series Communication Modules
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- Part Number: ALR121-S01
- Brand: Yokogawa
- Type: Communication Modules
- Dimensions: 3.3x10.7x13cm
- Country of Origin: Japan
- Barcode: 8537101190
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Additional Specifications
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Product Description
The Yokogawa ALR121-S01, also cataloged as the ALR121 Serial Communication Module, operates as a dedicated hardware component for half-duplex Modbus slave routing and subsystem data mapping within safety control station (SCS) platforms.
Suffix Breakdown & Model Matrix
The ALR121 series utilizes explicit engineering suffixes to define hardware builds, communication interface variants, and hardware style revisions. Below is the technical breakdown for the ALR121-S01 configuration:
- ALR121: Core base model designator for the dual-port serial communication module.
- -S: Standard type construction baseline for standard industrial enclosure installation.
- 0: Phase indicator slot mapping designator.
- 1: Style code indicating the physical hardware design revision or updated sub-component generation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ALR121-S01 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | Approx. 0.34 kg (0.75 lbs) |
| Dimensions | Standard Yokogawa ProSafe-RS I/O slot size |
| Operating Temp | Standard industrial cabinet environmental parameters apply |
| Power Consumption | Current consumption of 0.5 A via node backplane rail |
| Product Type | Serial Communication Modules |
| Physical Interface | RS-422 / RS-485 (4-wire system) |
| I/O Wiring Connections | Dual D-sub 9-pin female ports / M4 screw terminal block (5 poles x 2 ports) |
| Communication Function | Half-duplex tracking |
| Synchronization Method | Start-stop synchronization (Asynchronous) |
| Transmission Speeds | 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps |
| Data Coding | Binary transmission code |
| Character Architecture | 8 bits character length (fixed for Modbus slave and subsystem functions) |
| Stop Bit Alignment | 1 or 2 bits (fixed to 1 bit for subsystem communication) |
| Parity Configuration | None / even / odd selectable options |
| Turnaround Lag Time | 1 ms transmission delay parameter |
| Maximum Cable Length | 15 m (RS-422 point-to-point) / 1200 m (RS-485 multipoint) |
| Target Chassis Mounting | Compatible with S2SC70S, SSC60S, SSC50S, SSC57S, and SNB10D |
Process Control System Specifications
- 4-20 mA HART Loop Protocol Network Arbitration While executing dedicated serial transactions over RS-422/RS-485 physical lines, the module bridges isolated third-party master stations directly into the Safety Control Station (SCS) environment. This allows external networks to access or modify real-time registers without violating the execution timing of adjacent 4-20 mA safety instrumentation loops or safety-instrumented functions (SIF).
- Deterministic Processor Offloading and Channel Isolation The internal processor manages the Modbus slave protocol stack independently of the main safety processor. This architecture handles high-frequency asynchronous polling routines internally, suppressing line jitter and keeping transmission lag time fixed at 1 ms to prevent interference with deterministic safety logic tasks.
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