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Yokogawa ALE111-S51 Ethernet Communication Module

Configured for deterministic subsystem data exchange in CENTUM VP and CENTUM CS 3000 networks, the Yokogawa ALE111-S51 (ALE111 Ethernet Communication Module) provides direct physical-layer execution of 10 Mbps half-duplex transmission via RJ-45 interfaces.

Suffix Breakdown & Model Matrix

Code Element	Definition
ALE111	Ethernet Communication Module (FIO Type)
S	Standard Type
5	FCS (Field Control Station) Mounting
1	Basic Type with ISA Standard G3 Option

Hardware Specifications

Parameter	Specification
Brand	Yokogawa
Origin	Japan
Model	ALE111-S51
Weight	0.3 kg
Dimensions	125.5 mm (Height)
Operating Temperature	0 to 55 degC
Power Consumption	0.5 A @ Rack Bus Voltage
Transmission Speed	10 Mbps
Transmission Method	Half-Duplex
Connector Type	RJ-45
Max Distance	100 m (Single Segment)

4-20 mA HART Loop Protocol Support

The ALE111 series supports integration with conventional analog instrumentation utilizing the 4-20 mA HART protocol. This capability allows the module to coexist on the same physical network infrastructure where legacy field devices require superimposed digital communication for configuration and diagnostics, ensuring backward compatibility with existing plant assets without requiring full field rewiring.

Frequently Asked Questions

Q: Does the ALE111-S51 support hot-swapping?

A: Yes. The module can be removed and inserted while the FCS rack is powered, provided the control logic accounts for I/O hold states to prevent process upset.

Q: What is the maximum current load imposed on the backplane?

A: The module draws a maximum of 0.5 A from the FCS backplane power supply during full-duplex operation.

Q: Is redundant communication supported?

A: Dual-redundant configurations are supported when two modules are installed in adjacent slots and configured via system engineering tools.

Field Installation Guidelines

Install the module into the designated FCS I/O slot until the ejector levers lock. Use Category 5 unshielded twisted pair (UTP) cable for all RJ-45 connections. Maintain a minimum bend radius of 25 mm for all Ethernet cabling. Ensure the DCS cabinet ground potential is equalized with connected subsystems to prevent ground loops. Terminate the cable shield at one end only, typically at the cabinet earth bar, to mitigate common-mode noise. Verify link activity LEDs (ACT/TX/RX) before closing the cabinet door.

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