ALR111-S00 | Yokogawa | CENTUM VP Serial Communication Module

Product Overview

The Yokogawa ALR111-S00 acts as a high-performance serial gateway for the CENTUM VP and CS 3000 Distributed Control Systems. This module enables the Field Control Station (FCS) to interface with diverse third-party subsystems, including PLCs, flow computers, and analytical instruments via the RS-232C protocol. By offloading protocol processing from the main CPU, the ALR111-S00 maintains deterministic control over critical process data. We supply this unit as 100% Brand New and Original in factory-sealed packaging to ensure peak reliability for your plant’s communication backbone.

Part Number Breakdown

The ALR111-S00 follows a modular nomenclature that identifies its specific hardware grade and functional scope:

Technical Specifications

This module integrates directly into the FCS backplane to facilitate high-speed serial data exchange.

• Communication Interface: RS-232C.

• Number of Ports: 2 independent serial ports.

• Transmission Speed: Supports up to 115.2 kbps per port.

• System Integration: Plugs into the Field Control Station (FCS) I/O slots.

• Redundancy: Supports dual-redundant hardware configurations.

• Isolation: Galvanic isolation protects the DCS backplane from field-side electrical surges.

• Condition: Guaranteed 100% Brand New with original factory seal.

Engineering Advantages

The ALR111-S00 provides technical solutions for integrating legacy and third-party hardware into a modern DCS environment:

• Subsystem Synchronization: Many specialized instruments only support serial connectivity. The ALR111-S00 bridges this gap, allowing the CENTUM DCS to read and write variables to external devices, providing operators with a unified view of the entire process.

• High-Fidelity Signal Protection: Standard serial connections often suffer from noise in industrial environments. This module utilizes robust internal shielding and electrical isolation to prevent ground loops and electromagnetic interference (EMI) from corrupting process data.

• Dual-Port Versatility: The two-port design allows engineers to connect multiple devices to a single module slot. This maximizes rack space efficiency and reduces the overall hardware footprint in the control cabinet.

• Deterministic Failover: When installed in pairs, the ALR111-S00 provides seamless redundancy. If the active module detects a hardware fault or cable disconnection, the standby unit assumes communication tasks instantly, preventing any interruption to the process control logic.

FAQs

• Does the ALR111-S00 support Modbus communication?

  The ALR111-S00 provides the physical RS-232C layer. While it handles the electrical signals, your CENTUM software must include the appropriate Modbus RTU/ASCII communication drivers to interpret the data from your external device.

• What is the maximum cable distance for this module?

  As an RS-232C device, we recommend a maximum cable length of 15 meters (50 feet) to ensure signal integrity at high baud rates. For longer distances, you should consider using RS-232 to RS-422/485 converters.

• Can I replace an ALR111 with an ALR121?

  No. The ALR111 uses RS-232C, while the ALR121 is designed for RS-422/RS-485 communication. You must match the module type to your physical field wiring and the communication port of your subsystem.

• Is this a refurbished or original part?

  We sell only 100% Brand New hardware. Every ALR111-S00 arrives in its original Yokogawa factory box with intact seals and a full 12-month manufacturer-standard reliability expectation.