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Description
Yokogawa EB402-10 ER Bus Interface Master Module
The Yokogawa EB402-10ER, also cataloged as the EB402-10 ER Bus Interface Master Module, operates as a dedicated hardware component for ER Bus master-level communication control within CENTUM VP / CENTUM CS 3000 Distributed Control System (DCS) networks. The Yokogawa EB402-10ER executes deterministic backplane-driven data exchange between the FCU processor and distributed ER Bus slave I/O nodes via coaxial 10BASE-2 physical links.
HardwareSpecifications
Parameter
Specification
Model
Yokogawa EB402-10ER
Origin
Japan
Weight
0.3 kg
Dimensions
5.1 cm x 12.7 cm x 15.2 cm
OperatingTemp
Not specified
PowerConsumption
Not specified
Communication Interface
ER Bus over IEEE 802.3 10BASE-2
Transmission Speed
10 Mbps
Connector Type
BNC coaxial interface
Maximum Distance
Up to 185 m per segment (YCB141 cable)
Yokogawa Process Control Bus Execution Characteristics
The Yokogawa DCS communication architecture implements deterministic cyclic polling over ER Bus segments, where the EB402-10ER functions as the master arbitration node. Signal exchange integrity is maintained through channel-level electrical separation between backplane logic and external coaxial transmission lines.
In process data acquisition configurations, the module supports FOUNDATION Fieldbus / PROFIBUS-style integration mapping layers through system-level protocol translation in the CENTUM controller stack. Internal signal conditioning stages are designed to maintain stable data throughput under 10 Mbps bandwidth constraints without frame collision escalation under normal bus loading conditions.
Channel isolation is implemented between FCU backplane circuitry and external ER Bus interfaces to reduce susceptibility to external grounding noise and loop-induced voltage offsets in distributed node layouts.
Frequently Asked Questions
Q: Can the EB402-10ER module be hot-swapped during system operation? A: Hot-swap capability depends on FCU backplane design. In standard CENTUM VP FCU configurations, removal of the master ER Bus module typically requires controlled shutdown of the communication segment to prevent bus reinitialization faults.
Q: What is the electrical load impact on the FCU backplane? A: The module draws operating power directly from the FCU backplane supply rail. Load distribution is managed at rack level; no external power terminal is used.
Q: Does the module support redundant master configuration? A: Redundant operation is implemented via paired EB402 modules installed in adjacent FCU slots, operating in synchronized primary/standby mode with automatic failover arbitration.
Field Installation Guidelines
Ensure FCU chassis power is fully isolated prior to insertion or removal of the EB402-10ER module. Insert the module into the designated slot with controlled backplane alignment to avoid connector pin stress.
Maintain coaxial ER Bus cabling within 10BASE-2 impedance requirements using approved BNC termination practices. All cable shields must be grounded at a single-point reference to prevent loop current circulation across distributed I/O nodes.
Avoid routing ER Bus coaxial lines parallel to high-voltage switching conductors to reduce induced noise coupling. Verify termination resistance at both ends of each bus segment before system commissioning.
