YOKOGAWA KS1 Series Signal Cables — KS1*B

Technical Dossier

Product Details And Specifications

YOKOGAWA KS1 Series: Comprehensive Signal Cable Range and Technical Overview

The YOKOGAWA KS1 series signal cables are purpose-engineered interconnect solutions for YOKOGAWA's distributed control system (DCS) and field instrumentation platforms, including the CENTUM VP, CENTUM CS 3000, and EJX/EJA transmitter families. These cables are deployed across global heavy industry sectors — petrochemical complexes, nuclear power generation facilities, crude oil refineries, LNG terminals, and continuous process manufacturing plants — where signal integrity, EMI shielding, and long-term mechanical reliability are non-negotiable operational requirements. The KS1 series defines the physical layer of YOKOGAWA's field wiring architecture, providing standardized, pre-terminated cable assemblies that reduce installation error and support IEC 61511 functional safety compliance in SIL-rated loops.

The Evolution of KS1 Architecture

The KS1 cable series was introduced alongside YOKOGAWA's transition from analog panel-based instrumentation to fully digital DCS field wiring in the late 1990s. Early variants were designed to interface with the CENTUM CS platform, providing fixed-length, shielded twisted-pair assemblies with proprietary YOKOGAWA connectors on one or both termination ends. As the CENTUM CS 3000 platform matured through the 2000s and CENTUM VP was introduced in 2008, the KS1 series was extended to accommodate new I/O module form factors, higher channel-density marshalling cabinets, and FOUNDATION Fieldbus / HART-compatible signal paths.

The suffix notation in KS1 part numbers encodes critical configuration data: cable length (in meters), connector type (field-side vs. cabinet-side), shielding configuration, and number of pairs. The asterisk (*) in the base model designation KS1*B represents a variable length or configuration parameter that must be specified at time of order. Compatibility spans YOKOGAWA's FIO (Field I/O), ADV (Analog Input), AAI (Analog I/O), and AAT (Analog Transmitter) module families. Installers migrating from CENTUM CS 3000 to CENTUM VP must verify connector pinout compatibility, as certain KS1 sub-variants are not cross-compatible between generations without adapter harnesses.

KS1 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified KS1 series signal cable range. Each entry is classified by function and application context within YOKOGAWA DCS and field instrumentation architectures.

Signal Cable Assemblies — Field-to-Cabinet

• KS1*B: Standard shielded signal cable assembly, variable length, B-type cabinet connector, for CENTUM VP / CS 3000 analog I/O marshalling.
• KS1*C: Extended-length variant with C-type connector, used in large-footprint refinery marshalling cabinets requiring longer field cable runs.
• KS1*D: Dual-shielded assembly for high-EMI environments (motor control centers, variable frequency drive proximity installations).
• KS1*E: Short-run cable (typically 0.5–1.5 m) for within-cabinet module-to-module signal routing in CENTUM VP FCS cabinets.
• KS1*F: Field-side flying-lead variant, unterminated at field end, for custom junction box terminations in brownfield retrofit projects.

Multi-Pair Cable Assemblies — High-Density I/O

• KS1-2*B: 2-pair shielded cable assembly for dual-channel analog input modules (AAI141, AAI143 series).
• KS1-4*B: 4-pair assembly for quad-channel I/O modules, reducing marshalling cabinet wiring density.
• KS1-8*B: 8-pair high-density assembly for use with YOKOGAWA's high-density analog input cards in CENTUM VP R6 systems.
• KS1-16*B: 16-pair trunk cable for marshalling panel home-run wiring in large DCS installations.

Fieldbus & HART Signal Cables

• KS1-FF*B: FOUNDATION Fieldbus H1 segment cable, impedance-matched to IEC 61158-2 specification, for FF device trunk wiring.
• KS1-PA*B: PROFIBUS PA segment cable assembly, shielded, for YOKOGAWA ProSafe-RS and CENTUM VP PROFIBUS PA integration.
• KS1-HT*B: HART-compatible signal cable with additional filtering for HART FSK signal integrity over long cable runs.

Thermocouple & RTD Extension Cables

• KS1-TC*B: Thermocouple extension cable assembly, compensating-grade conductors, for direct TC signal transmission to YOKOGAWA AAT141 temperature input modules.
• KS1-RTD*B: 3-wire RTD extension cable for Pt100 / Pt1000 sensors, low-resistance conductors, for AAT145 RTD input modules.
• KS1-TC4*B: 4-pair thermocouple extension assembly for multi-point temperature measurement panels in fired heater and heat exchanger applications.

Power & Intrinsic Safety Cables

• KS1-IS*B: Intrinsically safe rated signal cable assembly, blue-sheathed per IEC 60079-14, for Zone 1 / Zone 2 hazardous area field device wiring.
• KS1-PWR*B: 24 VDC field device power cable assembly for loop-powered transmitter installations in CENTUM VP FCS I/O subsystems.

Sourcing Hard-to-Find & Obsolete KS1 Series Parts

The KS1 series spans multiple YOKOGAWA platform generations. Cables specified for CENTUM CS (pre-2003) and early CENTUM CS 3000 installations are no longer manufactured by YOKOGAWA and are classified as end-of-life (EOL). DriveKNMS maintains a dedicated inventory of new-old-stock (NOS) and refurbished KS1 cable assemblies sourced through authorized YOKOGAWA channel partners and verified secondary market suppliers globally.

For plants operating CENTUM CS 3000 systems beyond YOKOGAWA's standard support lifecycle (extended support available through YOKOGAWA's LS21 lifecycle program), DriveKNMS provides direct cable assembly replacement without requiring full I/O subsystem upgrades. This approach preserves existing marshalling cabinet wiring infrastructure and avoids the capital expenditure of a full DCS migration. Customers requiring obsolete KS1 sub-variants are advised to provide the full part number including length suffix and connector code to ensure exact cross-reference matching. DriveKNMS engineering staff can also produce custom-length KS1-compatible assemblies to original YOKOGAWA specifications where NOS stock is unavailable.

Quality Control for the KS1 Range

All KS1 series cable assemblies processed by DriveKNMS undergo a structured incoming inspection and functional verification protocol before dispatch. Inspection procedures include: continuity testing of all conductors and shield drain wires using a calibrated Megger MIT400 or equivalent insulation resistance tester at 500 VDC; connector pin-out verification against YOKOGAWA KS1 series wiring diagrams; shield continuity and isolation resistance measurement (minimum 100 MΩ at 500 VDC); visual inspection of connector housings, locking mechanisms, and cable jacket integrity; and length verification against the part number suffix specification. For FOUNDATION Fieldbus and PROFIBUS PA variants, characteristic impedance is verified using a TDR (Time Domain Reflectometer) to confirm compliance with IEC 61158-2 segment cable requirements. All test results are documented and available upon request with each shipment.