Yokogawa KS9-10*B KS9 Signal Cable (50-50 pins)

The Yokogawa KS9-10*B, also cataloged as the KS9 Signal Cable (50-50 pins), operates as a dedicated hardware component for multi-channel analog and digital I/O signal routing within Yokogawa CENTUM DCS terminal board architectures.

Suffix Breakdown & Model Matrix

Hardware Specifications

Channel Isolation and 4-20 mA HART Loop Signal Preservation

The KS9-10*B cable assembly maintains signal integrity for high-density analog 4-20 mA HART loop communication and digital discrete field channels. Individual conductor pairs inside the 10 m cable jacket feature precise twisted-pair geometry to mitigate cross-talk and magnetic induction between adjacent I/O channels. Designed to operate with channel-to-channel isolated I/O modules, the overall foil and braided shield configuration routes high-frequency electrical noise to chassis ground, ensuring zero degradation of superimposed HART digital frequency-shift keying (FSK) signals across the entire 10 m transmission path.

Frequently Asked Questions

Q: What is the maximum signal degradation or resistance expected over the 10 m length of the KS9-10*B cable?

A: The conductor resistance is rated below 0.09 ohm per meter at 20 deg C, resulting in a total loop resistance under 1.8 ohm for a 10 m run. This voltage drop is negligible for standard 4-20 mA current loop instruments and 24 VDC digital input channels.

Q: Can the KS9-10*B cable be disconnected or reconnected while field I/O channels are powered?

A: Hot-swapping the cable while field loops are energized is permissible under low-voltage conditions (30 VDC or less), provided connected DCS I/O modules support live terminal removal. However, disconnecting multi-channel cables de-energizes all 50 pin assignments simultaneously, disrupting active field control loops.

Q: How is shield continuity maintained between the 50-pin connectors?

A: Shield continuity is routed through dedicated grounded connector shell contacts and drain wires embedded at both ends, allowing direct grounding to the DCS rack backplane frame upon mating.

Field Installation Guidelines

1. Cable Bend Radius: Maintain a minimum static bend radius of 80 mm and a dynamic bend radius of 120 mm during installation to prevent internal conductor strain or shield separation.
2. Connector Mating and Fastening: Align the 50-pin connector keyways straight before insertion. Hand-tighten all mechanical retaining screws to ensure solid contact pressure and prevent connector detachment under vibration.
3. Cable Routing and Separation: Route the signal cable through standard wire ducts, maintaining a minimum physical clearance of 300 mm from high-voltage AC power lines, variable frequency drive outputs, and heavy inductive loads to prevent electromagnetic interference.
4. Grounding Protocol: Connect the cable drain wire directly to the functional earth (FE) bus bar at one end (DCS side) to avoid circulating ground loop currents.