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Yokogawa STB4D-10 CENTUM Series Terminal Board

The Yokogawa STB4D-10, also cataloged as the STB4D Pressure Clamp Terminal Block, operates as a dedicated hardware component for physical signal termination and channel distribution within CENTUM VP and ProSafe-RS control networks. Configured for high-density signal distribution, the hardware provides direct physical/electrical execution of field wiring connections to upstream input/output modules. The component routes discrete loop circuitry through a dual-redundant architecture, accommodating up to 16 channels or 8 channels in redundant configurations, ensuring continuous operational continuity at the physical layer without signal line interruption.

Hardware Specifications

Parameter Specification
Model STB4D-10
Brand Yokogawa
Origin Japan
Weight 0.4 kg
Dimensions 65.6 mm x 72 mm x 114 mm
Operating Temp -20 to +70 deg C
Power Consumption Not Specified
Product Type Pressure Clamp Terminal Blocks
Channel Capacity 16 or 8 channels (dual-redundant)
Connection Type Pressure-clamp terminal block
Rated Voltage 24 VDC
Rated Current 10 A
Surge Protection Optional EMC surge absorber
Compliance EN 61000-6-2 EMC standards
Mounting DIN rail or wall mount

Process Control Terminal Array Characteristics

The terminal board integrates hardwired termination paths engineered to interface with 4-20 mA HART loop protocol physical circuits. Dedicated internal trace layouts provide localized channel-to-channel isolation, minimizing transient electrical cross-talk and protecting adjacent signaling pairs from common-mode voltage faults. For specialized temperature transmitters, the assembly incorporates passive cold junction compensation (CJC) reference junctions directly on the physical termination block, ensuring thermal measurement tracking accuracy during environment-induced temperature excursions.

Frequently Asked Questions

Q: How is dual-redundant signal routing electrically maintained on this terminal board?

A: The physical board architecture routes each field signal channel through parallel trace matrices connected to separate multi-pin system cable headers. This layout allows two independent I/O modules to interface with the exact same field loops concurrently without loading down the signal paths.

Q: Under what conditions should the optional EMC surge absorber version be deployed?

A: The surge absorber variant must be specified when field wiring runs through outdoor areas or high-exposure industrial zones subject to lightning strikes, power switching transients, or severe electromagnetic interference that exceeds standard EN 61000-6-2 testing levels.

Q: Can the pressure clamp terminals accept solid and stranded field wires without modifications?

A: Yes. The pressure clamp mechanical assembly exerts direct, continuous spring pressure onto the bare conductor wire. Ensure the wire strip length matches factory installation tolerances to secure a low-resistance gas-tight physical connection.

Field Installation Guidelines

  • DIN Rail Mounting Stability: Snap the terminal board onto a standard 35 mm DIN rail, verifying that the metal grounding clip firmly engages the bare metal of the rail. Secure end brackets on both sides to prevent lateral shifting.
  • Shield Grounding Matrix: Terminate all incoming twisted-pair field shields directly to the chassis earth grounding bar located adjacent to the block. Do not connect the loop shields to the terminal block signal terminals.
  • Wiring Entry Practices: Dress all field cables neatly inside plastic wire ducts. Maintain a minimum separation distance of 200 mm between low-voltage signal wires entering this board and parallel high-voltage AC electrical lines.
  • Terminal Engagement: Verify that no stray copper strands remain exposed outside the pressure clamp frame after inserting and securing the field wire to eliminate potential short circuits between adjacent channels.

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