AND20 Yokogawa Centum VP Series Node Interface Unit

Configured for high-density signal distribution in Centum VP control networks, the Yokogawa AND20, also cataloged as the AND20 Node Interface Unit, provides direct physical/electrical execution. It coordinates real-time data frame synchronization and routing between remote industrial I/O nodes and central processing blocks across a dual-redundant RIO bus architecture.

Hardware Specifications

Distributed Process Control & Fieldbus Topologies

• 4-20 mA HART Loop Protocol and Fieldbus Routing Layer The module manages local communication bus density, digitizing physical process telemetry from multi-channel field arrays. It processes 4-20 mA HART digital variables alongside legacy analog packets, parsing the data streams before packet encapsulation to ensure error-free transmission over the primary DCS backplane bus.
• Channel-to-Channel Isolation and Optical Safety Controls Internal circuit paths integrate galvanic isolation blocks to interrupt high-voltage transients between the power rails, logical bus elements, and adjacent I/O sub-assemblies. This prevents localized field ground loops from compromising backplane stability and eliminates electrical crosstalk across high-density signal channels.

Frequently Asked Questions

Q: How does the dual-redundant RIO bus interface execute a changeover during a physical line fault?

A: The internal bus arbitration hardware monitors transmission integrity parameters continuously across both lines. If a packet timeout or signal degradation is detected on the primary line, the processing core executes an automated switchover to the secondary redundant path in under one frame cycle, preventing data drops or control action interruptions.

Q: What are the primary considerations for handling the 35 kg shipping weight during cabinet unboxing and mounting?

A: The weight reflects the heavy-duty mechanical shielding and backplane architecture of the cabinet installation housing. The chassis must be handled using appropriate mechanical lifting guides or two-person lift procedures, ensuring it is anchored onto heavy-duty vertical support rails rather than suspended from standard thin-gauge sheet panels.

Field Installation Guidelines

• Chassis Alignment, Weight Distribution, and Cabinet Mounting Position the heavy unit into the dedicated slot layout of the industrial control cabinet. Secure the assembly using heavy-duty industrial rack bolts tightened to factory specifications to eliminate mechanical sagging or alignment stress on the rear backplane interconnect rails under structural vibration conditions.
• Signal Routing, Low-Impedance Grounding, and Shielding Blocks Route the primary and secondary RIO bus copper or fiber links through independent wireways to prevent a localized physical incident from disrupting both redundant communication paths. Ground all metal enclosure frames and signal drain wires directly to the low-impedance master instrument earth bar using standard grounding clamps to eliminate high-frequency electromagnetic interference.