Overview
Specification
| Parameter | Specification |
|---|---|
| Model | ALR111‑S51 |
| Module Type | Serial Communication Module (RS‑232C) |
| Interface | RS‑232C, 2 ports |
| Connection Method | Point-to-point serial link |
| Communication Function | Half‑duplex serial communication |
| Synchronization Method | Start–stop synchronization |
| Supported Transmission Speeds / Baud Rates | 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps |
| Transmission Code Format | Binary (fixed 8-bit for Modbus-slave or subsystem communication) |
| Character Length | 8 bits (for Modbus-slave and subsystem communication functions) |
| Stop Bit Length | 1 or 2 bits (subsystem function fixed to 1 bit) |
| Parity Options | None / Even / Odd |
| Response Latency (after transmission) | 1 ms lag time before next reception cycle begins |
| Maximum Transmission Distance | Up to 15 meters (RS‑232C) |
| Wiring / Connector | Dual D-sub 9-pin female connectors (2 ports) |
| Power Supply / Current Consumption | 24 V DC (via base unit), 0.5 A typical |
| Operating Temperature Range | 0°C to +55°C |
| Storage Temperature Range | –20°C to +70°C |
| Relative Humidity | 5% to 95% RH, non-condensing |
| Mounting / Installation Method | Mounted on compatible safety control / control station modules |
| I/O Wiring Cable Types | Supports Yokogawa AKB series cables (e.g. AKB131, AKB132, AKB135, AKB136) |
| Supported Communication Functions | Modbus-slave communication; subsystem communication function |
| Weight | Approx. 0.3 kg |
FAQ
A1: It supports Modbus, Profibus DP, and Yokogawa proprietary protocols for versatile connectivity.
Q2: Can this module operate in high-temperature environments?
A2: Yes, it operates reliably between 0–55°C and stores safely up to 70°C.
Q3: Is the ALR111-S51 compatible with older CENTUM VP systems?
A3: Yes, it integrates seamlessly with existing CENTUM VP field control stations.
Q4: How is the module powered?
A4: It requires a 24 V DC supply with ±10% tolerance.
Q5: What installation options are available?
A5: The module can be mounted on racks or DIN rails depending on system layout.
Q6: Does the module support remote device connectivity?
A6: Yes, it enables stable communication with multiple remote field devices through serial interfaces.
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