Yokogawa KS1-20 Signal Cable

The Yokogawa KS1-20, also cataloged as the KS1-20 Signal Cable, operates as a dedicated hardware component for multi-channel I/O signal transmission within Yokogawa DCS platforms. The assembly establishes a direct physical interconnect between system I/O modules and field terminal boards. It conducts parallel control and measurement signals via dual 40-pin connectors across cable lengths up to 20 meters without signal attenuation.

Hardware Specifications

4-20 mA HART Loop Protocol and Channel Isolation

The Yokogawa KS1-20 system cable incorporates twisted-pair internal conductors enclosed within an overall braided shield to maintain channel-to-channel isolation across all 40 signal pins. This construction preserves signal integrity during multi-channel 4-20 mA analog output and HART protocol digital communication, preventing cross-talk between adjacent loops. The grounded cable shield suppresses high-frequency electromagnetic interference (EMI) in industrial control cabinets, maintaining steady noise-free data paths between DCS modules and field wiring termination units.

Frequently Asked Questions

Q: What are the primary physical terminations on the Yokogawa KS1-20 cable?

A: The cable features standard 40-pin industrial connectors on both ends designed for direct mating with Yokogawa DCS I/O cards and terminal boards.

Q: What is the maximum physical cable length represented by the -20 suffix?

A: The -20 suffix code specifies an overall cable assembly length of 20 meters.

Q: Can the KS1-20 cable be disconnected while the DCS I/O module is energized?

A: Signal-level hot-swapping is permissible provided field loop power is de-energized or system field interlocks are configured prior to disconnection.

Field Installation Guidelines

1. Inspect both 40-pin connectors for bent pins, dust, or locking clip damage prior to insertion.
2. Align the keyway of the 40-pin connector with the header on the Yokogawa DCS I/O card and push straight in until locked.
3. Attach the cable shield grounding drain wire to the designated rack cabinet ground bar to ensure continuous EMI shielding.
4. Maintain a minimum cable bend radius of 4.0 inches (100 mm) along the 20-meter cable run to prevent conductor strain.
5. Avoid running the signal cable parallel to high-voltage AC lines or variable frequency drive power conductors in cabinet wire ducts.