ST3*A Yokogawa CENTUM VP Interface Module

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YOKOGAWA ST3*A System Bus Interface Module The YOKOGAWA ST3*A serves as the primary ST3 A System Bus Interface Module utilized...

SKU: ST3*A

Manufacturer: Yokogawa
Product No.: ST3*A
Product Type: Interface Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 400g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

YOKOGAWA ST3*A System Bus Interface Module

The YOKOGAWA ST3*A serves as the primary ST3 A System Bus Interface Module utilized to execute deterministic data transfer across CENTUM VP platforms. This hardware component mounts directly into the field control unit (FCU) rack slot to establish a physical and electrical communication link between the internal logic processors and the external ESB/ER extension buses. The unit processes field signal configurations via embedded diagnostic circuitry, utilizing localized light-emitting diodes (LEDs) to monitor link status, bus activity, and hardware faults in real time.

Hardware Specifications

Parameter	Specification
Model	ST3*A (ST3 A)
Brand	Yokogawa
Origin	Japan
Weight	0.4kg
Dimensions	120 x 25 x 130 mm
Operating Temp	0 to 60 deg C
Power Consumption	5 VDC, ~1.2 A
System Compatibility	CENTUM VP, CS 3000
Communication Protocol	ESB/ER bus
Redundancy	Dual-redundant communication supported
Data Transfer Rate	100 Mbps (typical)
Isolation	1500 VAC (system-to-bus, 1 min)
Signal Density	32 points (16 x 2 configuration)
Field Connection Type	M4 Screw Terminals
Diagnostics	LED indicators for link, activity, and fault
Humidity Range	5 to 95% RH, non-condensing
Mounting	Rack-mounted (FCU slot)
Certifications	CE, UL, RoHS compliant

DCS Process Control & Analog Loop Execution

The YOKOGAWA ST3*A incorporates channel-to-channel isolation architecture to prevent high-voltage transients from compromising the internal system bus logic during active data acquisition. Operating over the ESB/ER bus protocol, the module provides a strict 1500 VAC galvanic isolation barrier between the processing logic and external physical lines. Internal circuitry mitigates common-mode noise issues, allowing the 32-point signal distribution matrix to maintain linear signal integrity without zero-drift distortion. The module dynamically manages data packet prioritization over the 100 Mbps communication medium, enabling continuous synchronization between remote expansion chassis and the master controller.

Frequently Asked Questions

Q: How does the module handle a communication failure on the primary ESB/ER bus line?

A: The module executes a dual-redundant tracking routing strategy. If the primary extension bus link experiences a packet timeout or signal degradation, the onboard hardware logic initiates a hot-standby switchover to the secondary redundant bus line without causing an interruption in the control process.

Q: Is it permissible to perform an online hot-swap of this module while the FCU is live?

A: Yes, online replacement is supported provided that the parallel tracking module is fully functional and synchronized. The field technician must confirm that the active mate displays a solid green link status and no fault indications before extracting the module from the backplane connector.

Q: What are the primary structural differences between the two weight specifications listed in product variants?

A: The base rack-mounted card component weighs approximately 0.35 kg, whereas variations equipped with integrated M4 screw terminal block assemblies and structural field wiring enclosures weigh up to 1.5 kg.

Field Installation Guidelines

Module Insertion: Align the printed circuit board edges with the guide rails of the designated FCU slot. Smoothly slide the module inward until the rear pins seat completely into the backplane connector, then secure the top and bottom latch mechanisms.
Shield Grounding Matrix: Connect all external signal cable shields to the main instrumentation ground bus of the cabinet. Do not configure multi-point shield connections, as this induces ground loop interference across the 32-channel system.
Cable Routing Constraints: Route the high-speed ESB/ER bus cables through dedicated low-voltage wiring trays. Maintain a minimum physical clearance of 300 mm from any high-current AC power conductors or variable frequency drive cables.
Thermal Conditioning: Verify that the open spaces above and below the FCU rack remain free of obstructions. The ambient air inside the enclosure must not exceed 60 deg C to protect the internal galvanic isolation components from thermal degradation.

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