Description

Yokogawa STA4D-00 Terminal Block

Configured for field wiring termination in CENTUM distributed control I/O interfacing, the Yokogawa STA4D-00 (STA4D-00) terminal block provides direct electrical breakout for 16-channel digital signal routing within Yokogawa CENTUM VP / CS 3000 I/O architectures. The assembly implements dual-redundant ready channel topology and fixed screw-clamp termination for hardwired field device integration without active signal conditioning.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa STA4D-00
Origin	Not specified in source data
Weight	0.3 kg
Dimensions	65.6 mm x 72 mm x 52.3 mm
OperatingTemp	-10 degC to +55 degC
PowerConsumption	Not specified
Channels	16
Configuration	Dual-redundant ready
Connection Type	M4 screw terminal
Withstand Voltage	500 VAC
Insulation Resistance	>= 100 MOhm (500 VDC)
Surge Protection	Built-in surge absorber

Field wiring isolation and channel termination behavior

The Yokogawa STA4D-00 is aligned with process I/O termination requirements where channel-level segregation and noise rejection are implemented at the terminal interface. In Yokogawa DCS architectures, signal paths from field devices are typically routed through shielded cabling into M4 screw terminals, maintaining consistent impedance conditions prior to I/O module acquisition. The built-in surge absorption stage provides transient energy clamping at the termination boundary, limiting overvoltage propagation toward back-end I/O electronics. Channel density (16 points) is fixed and does not support dynamic reconfiguration.

Frequently Asked Questions

Q: Does the STA4D-00 support hot-swap during live I/O operation?
A: No hot-swap capability is defined at the terminal board level. Field wiring removal or replacement requires isolation of associated I/O channels to avoid transient injection.

Q: Is channel-to-channel electrical isolation implemented?
A: Isolation is implemented primarily at the system and I/O module layer. The terminal board provides physical segregation via discrete M4 terminals but does not perform active galvanic isolation.

Q: Can the surge absorber be disabled or bypassed?
A: No bypass configuration is specified. The surge suppression element is integrated into the terminal path design.

Field Installation Guidelines

Field wiring shall be terminated using M4 ring or fork terminals with controlled torque application to ensure stable contact resistance. Shielded cable drain wires should be grounded at a single-point reference to avoid ground loop formation across redundant signal paths. Maintain minimum separation between high-voltage and signal wiring within cabinet routing. Conduct insulation resistance testing at 500 VDC only after full disconnection from I/O modules. Avoid mechanical stress on terminal rows during cable dressing to prevent micro-loosening of screw clamps.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems