Product Overview

The Yokogawa AKB337-M020 is a high-integrity signal interface cable (often referred to as a KS Cable) specifically designed for CENTUM VP and ProSafe-RS Distributed Control Systems. This 20-meter cable facilitates the direct, high-density connection between Field I/O (FIO) modules and their corresponding terminal boards or marshalling panels. By utilizing the AKB337-M020, engineers eliminate the need for thousands of individual point-to-point wires, significantly reducing the risk of wiring errors and accelerating system commissioning in oil & gas, chemical, and power facilities.

(Note: While some references mistakenly categorize the AKB337 as a power module, it is technically a high-performance signal cable for DCS interface.)

Condition: 100% Brand New, New Old Stock (NOS), Original Japan.

Part Number Breakdown: AKB337 Series

Yokogawa uses a structured suffix system to define cable interface types and lengths.

• AKB337: Signal Interface Cable (KS Cable) for FIO modules.

• -M: Metric measurement standard.

• 020: Specifies a total length of 20 Meters.

• -NL: Standard non-explosion protected, standard sheath variant.

Technical Specifications

The AKB337-M020 provides low-resistance signal paths with industrial-grade shielding.

Engineering Advantages

• Elimination of Wiring Errors: The AKB337-M020 uses pre-terminated, keyed connectors. This ensures that every I/O point on the module maps perfectly to the corresponding terminal on the board, removing the possibility of cross-wiring that often plagues manual terminations.

• Dramatic Installation Speed: Connecting 32 channels of I/O via a single AKB337-M020 cable takes seconds compared to hours of stripping, crimping, and labeling individual wires. This speed is vital for meeting tight deadlines during plant turnarounds or new construction.

• Superior Noise Immunity: The cable features integrated shielding and twisted-pair architecture. This design effectively rejects electromagnetic interference (EMI) and radio-frequency interference (RFI), maintaining signal purity for sensitive 4-20 mA analog loops over the full 20-meter distance.

• Space Optimization in Racks: The multi-core design significantly reduces the bulk of cable bundles within the control cabinet. This improves airflow and allows for more organized, manageable cable management in high-density FIO nests.

FAQs

Q: Can I cut the AKB337-M020 to a shorter length?

A: We do not recommend cutting the cable. The connectors are factory-molded and tested for signal integrity and impedance. Shortening the cable manually risks introducing noise and voids the technical performance specifications. If you require a shorter run, please select the M005 (5m) or M010 (10m) variants.

Q: Does this cable support both analog and digital signals?

A: Yes. The AKB337-M020 carries standard 24V DC digital signals and 4-20 mA analog signals. However, ensure that the I/O module and terminal board pins match the cable's internal pinout configuration.

Q: What is the benefit of the "NOS" (New Old Stock) status?

A: NOS indicates the product is 100% brand new and unused, typically held as a spare part. It provides a cost-effective way to acquire original Yokogawa hardware that maintains the same performance standards as current production runs.

Q: Is the 20-meter length too long for 4-20 mA signals?

A: No. Because the AKB337-M020 uses high-quality tinned copper and appropriate gauge conductors, signal attenuation is negligible at 20 meters, provided the loop resistance stays within the 750 Ω limit of the output module.