EC401-51 Yokogawa ESB Bus Coupler Module

Yokogawa EC401-51 CENTUM VP ESB Bus Coupler Module

Yokogawa EC401-51 CENTUM VP ESB Bus Coupler Module

Availability: 20 left in stock

Yokogawa EC401-51 ESB Bus Coupler Module The Yokogawa EC401-51, also cataloged as the EC401 ESB Bus Coupler Module, operates as...

SKU: EC401-51

Manufacturer: Yokogawa
Product No.: EC401-51
Product Type: Communication Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 300g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa EC401-51 ESB Bus Coupler Module

The Yokogawa EC401-51, also cataloged as the EC401 ESB Bus Coupler Module, operates as a dedicated hardware component for high-speed inter-rack communication within CENTUM VP, CS3000, and ProSafe-RS control platforms. Installed in Field Control Units (FCUs), this module provides physical and logical interfacing to link controller backplanes with remote ESB bus node units across 128 Mbps deterministic communication lines.

Suffix Breakdown & Model Matrix

Code / Suffix Segment	Configuration Detail	Functional Specification
Base Model: EC401	ESB Bus Coupler Module	Inter-rack communication interface for FCU and node extension
Suffix: -5	Standard Type	Standard hardware variant with no explosion protection
Suffix: 1	Environmental Protection	Factory-treated with ISA Standard G3 conformal coating

Hardware Specifications

Parameter	Specification
Model	EC401-51
Brand	Yokogawa
Origin	Japan
Weight	0.3 kg
Dimensions	120 mm x 25 mm x 130 mm
Operating Temp	0 to +55 deg C
Power Consumption	5 V DC, 0.5 A maximum (rack backplane supplied)
Transmission Speed	128 Mbps
Bus Protocol	Yokogawa proprietary ESB bus
Maximum Distance	Up to 10 m per ESB bus segment
Supported Node Units	ANB10D, ANB11D, and FIO node extension units
System Compatibility	CENTUM VP, CENTUM CS 3000, and ProSafe-RS
Redundancy Support	Dual-redundant bus coupler configuration
Dielectric Strength	1500 V AC for 1 minute
Insulation Resistance	100 M ohm minimum at 500 V DC
Storage Temperature	-25 to +70 deg C
Operating Humidity	10% to 95% RH (non-condensing)
Environmental Coating	ISA Standard G3 compliant

4-20 mA HART Loop Protocol and Channel-to-Channel Isolation

The EC401-51 module acts as a high-density data pipeline, transferring field variable arrays from remote node I/O modules directly to the Field Control Unit CPU. Digital HART device variables overlaid onto field 4-20 mA current loops pass through node interface cards and cross the 128 Mbps ESB bus via the EC401-51 without data degradation. The module incorporates 1500 V AC isolation barriers between the internal backplane bus and external ESB transmission drivers. This isolation prevents field-side electrical transients and common-mode noise from propagating across extension cables to the main controller backplane, preserving signal integrity across high-density I/O networks.

Frequently Asked Questions

Q: Can the EC401-51 module be replaced while the Field Control Unit remains powered up?

A: Online replacement depends on system architecture. In dual-redundant configurations, engineers can hot-swap a faulty EC401-51 module while the redundant partner card maintains active ESB bus communication without interrupting control loops.

Q: What cable type is required for inter-rack connection via the EC401-51?

A: The module requires dedicated Yokogawa ESB bus cables engineered to match the 128 Mbps impedance specifications and maximum 10 m length restrictions per segment.

Q: How does ISA Standard G3 compliance impact module operational life?

A: The G3 conformal coating protects electronic trace geometries and surface-mount components from airborne corrosive gases, such as hydrogen sulfide and sulfur dioxide, in aggressive process environments.

Field Installation Guidelines

When integrating the Yokogawa EC401-51 module into a controller rack, follow these technical procedures:

Power down the rack or verify dual-redundant operational status before inserting the unit into its assigned FCU coupler slot.
Align the module edge connector with the backplane slot guides and seat the unit firmly until top and bottom retention latches lock.
Attach designated ESB bus interface cables to the front panel connectors, tightening captive thumbscrews to secure signal contact.
Maintain a minimum bending radius on ESB bus cables to avoid mechanical stress on internal signal conductors and shield foil.
Verify that cable shield grounds terminate directly to the cabinet main earth bar to suppress high-frequency electromagnetic interference.

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