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Yokogawa ALE111-S51 Ethernet Communication Module

Configured for high-speed data exchange in CENTUM VP and CS 3000 platforms, the Yokogawa ALE111-S51 (ALE111-S51 Ethernet Communication Module) provides direct physical connectivity between the control system bus and external network-based subsystems.

Suffix Breakdown & Model Matrix

The ALE111 base module defines the standard Ethernet interface architecture. The Suffix codes specify the following hardware constraints:

  • -S: Standard type hardware configuration.

  • 5: Certified for installation in non-hazardous area environments (no explosion protection).

  • 1: Compliant with ISA Standard G3 for corrosion resistance in harsh industrial atmospheres.

Hardware Specifications

Parameter Specification
Model ALE111-S51
Brand Yokogawa
Origin Japan
Weight 0.25 kg
Dimensions 107.5 x 130 x 32.8 mm
Operating Temp 0 deg C to +60 deg C
Power Consumption 5 VDC (max 300 mA)
Communication 10BASE-T / 100BASE-TX
Ports 2 (Dual-redundant)

Process Control Connectivity

The ALE111-S51 architecture utilizes optical isolation between the system bus and the external Ethernet ports to prevent ground potential differences and transient surges from propagating into the control network. For complex process integration, the module facilitates transparent data flow compliant with 4-20 mA HART loop protocol translation when interfacing with auxiliary smart gateways. The module supports channel-to-channel isolation logic to maintain signal integrity during high-traffic network bursts, ensuring deterministic data delivery across the Vnet/IP or standard Ethernet layers.

Frequently Asked Questions (FAQ)

Q: Does the ALE111-S51 support redundant communication link configurations?

A: Yes. The module features two physical Ethernet ports, enabling dual-redundant link configurations where the control system automatically switches to the secondary port in the event of primary link failure.

Q: Is this module compatible with live extraction and replacement (hot-swap)?

A: Yes. The ALE111-S51 is designed for hot-swapping into powered node racks. Prior to removal, ensure the communication channel is logically isolated within the DCS software to prevent transient network errors or diagnostic alarms.

Field Installation Guidelines

  • Mounting: Seat the module into the designated rack slot, ensuring the backplane pins are properly aligned. Engage the locking mechanism fully to guarantee mechanical stability and electrical contact with the 5 VDC power rails.

  • Cable Shielding: Utilize shielded category 5e or 6 Ethernet cabling. Ensure the cable shield is properly terminated at the equipment grounding point to suppress electromagnetic interference (EMI) originating from nearby power cables.

  • Network Topology: Maintain adherence to standard Ethernet distance limitations. Avoid routing communication cables in the same conduit as high-voltage AC lines to prevent inductive noise injection into the 100BASE-TX signals.

  • Verification: Following installation, perform a link status verification using the system management software to ensure both ports exhibit correct impedance and packet acknowledgment on the target network segment.

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