VE4070 S-Series Local Bus Isolator and Carrier Module | Emerson

Configured for local bus signal stabilization in DeltaV control networks, the Emerson VE4070 (VE4070 Local Bus Isolator and Carrier) provides direct physical/electrical execution of bus signal conditioning and module interconnectivity.

Hardware Specifications

Process Control: Channel-to-Channel Isolation

The VE4070 module is engineered to provide galvanic isolation between the local bus segments. This isolation barrier is necessary to mitigate common-mode noise and prevent potential ground loops from propagating across the control backplane. By separating the local bus signal lines, the module maintains the integrity of high-speed data packets between controllers and I/O modules, even when subjected to electromagnetic interference. The design utilizes passive and active conditioning circuits to ensure that signal thresholds remain stable, effectively shielding the backplane communication bus from external electrical faults or transient surges originating in the I/O field circuits.

Frequently Asked Questions (FAQ)

Q: What is the primary purpose of the VE4070 module?

A: The VE4070 functions as an isolator and carrier for the local bus in the DeltaV system. It serves to decouple bus segments to protect the communication signal integrity and provides a physical mounting interface for system modules.

Q: Can the VE4070 be installed in corrosive environments?

A: Yes. The device is rated to meet ISA-S71.04-1985 Class G3 standards for airborne contaminants. Ensure the cabinet environment is controlled to prevent excessive moisture, which remains a requirement (5% to 95% non-condensing) for reliable operation.

Field Installation Guidelines

• Mounting: Secure the VE4070 to the I/O mounting rail using the integrated mechanical fasteners. Ensure the module is seated vertically to maintain structural stability and allow for proper air circulation around the housing.

• Grounding: Verify that the carrier backplane is connected to the cabinet's protective earth. A low-impedance connection is mandatory to maintain the efficacy of the isolation barrier and surge suppression features.

• Signal Integrity: Use factory-specified backplane cabling for all local bus interconnections. Avoid routing signal cables in parallel with high-voltage power lines to prevent induced noise injection.

• Inspection: Upon installation, check all backplane connectors for pin alignment. Verify that locking mechanisms are fully engaged to prevent intermittent communication failures due to vibration or mechanical shock.