Description

Yokogawa ALR111-S00 Serial Communication Module

Configured for serial data exchange in Yokogawa CENTUM VP distributed control systems, the Yokogawa ALR111-S00 (ALR111 Serial Communication Module) provides direct physical execution of RS-232C point-to-point communication links to external subsystems.

Suffix Breakdown & Model Matrix

Suffix Position	Code	Definition
Base Model	ALR111	Serial Communication Module (RS-232C, 2 ports)
Option Code 1	S	Standard type
Option Code 2	0	Basic type (No special coating/variants)
Option Code 3	0	Basic type (No explosion protection)

Hardware Specifications

Parameter	Specification
Brand	Yokogawa
Origin	Japan
Model	ALR111-S00
Weight	0.3 kg
Dimensions	Not specified in source data
Operating Temp	0 to 50 degC
Power Consumption	0.5 A at 5 VDC
Interface	RS-232C
Transmission Speed	1200, 2400, 4800, 9600, 19200, 38400 bps
Transmission Distance	Max 15 m
Connection Method	Point-to-point
Synchronization	Start-stop synchronization

Channel-to-Channel Isolation and Loop Integrity

The module interfaces support channel-to-channel isolation to prevent ground loops when interfacing with heterogeneous third-party devices such as PLCs and analyzers. Implementation of 4-20 mA HART loop protocol translation is managed via the DCS application logic. Electrical isolation is maintained through the backplane connection to the Node Unit (ANB10/ANB11/ANR10), ensuring that transient voltages on the serial lines do not propagate to the FCS processor.

Frequently Asked Questions

Q: Is the ALR111-S00 hot-swappable?

A: Yes. When installed in a dual-redundant configuration with a paired module in an adjacent slot, the unit supports online replacement without interrupting the control process.

Q: What is the maximum cable distance for RS-232C connections?

A: The maximum transmission distance is 15 meters per port. Exceeding this limit may result in signal degradation due to RS-232C voltage level attenuation.

Q: Can this module be used for multipoint networks?

A: No. The ALR111-S00 is strictly limited to point-to-point RS-232C connections. For multipoint configurations, the ALR121 (RS-422/RS-485) model must be used.

Field Installation Guidelines

Install the module into the designated slot of the Node Unit (ANB10, ANB11, ANR10, F50, AFV10, FV30, or AFV40). Use approved I/O wiring components including AKB131, AKB132, AKB133, AKB134, or 3-pair shielded cable (AKB161/AKB162). Ensure the shield drain wire is terminated at the DCS cabinet ground bus bar only, maintaining a single-point ground to mitigate EMI. Verify that the backplane power supply has sufficient current margin for the 0.5 A consumption of the module before energizing the system.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems