ST7*A Yokogawa CENTUM Series Datasheet & Technical Manual

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Yokogawa ST7*A CENTUM Series Multipoint Status Output Card The Yokogawa ST7*A, also cataloged as the Yokogawa ST7-A Multipoint Status Output...

SKU: ST7*A

Manufacturer: Yokogawa
Product No.: ST7*A
Product Type: Digital Output Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 540g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa ST7*A CENTUM Series Multipoint Status Output Card

The Yokogawa ST7*A, also cataloged as the Yokogawa ST7-A Multipoint Status Output Card, operates as a dedicated hardware component for relay contact status execution within CENTUM VP, CENTUM XL, and u-XL network architectures.

Hardware Specifications

Parameter	Specification
Model	ST7*A (ST7-A)
Brand	Yokogawa
Origin	Japan
Weight	0.54 kg (1.19 lbs)
Dimensions	220 mm x 210 mm x 80 mm
Operating Temp	-10 to +55 deg C (Standard); Extended -20 to +85 deg C dependent on configuration
Power Consumption	24 VDC +-10% or 85-132 VAC / 170-264 VAC (Nest type dependent)
Output Type	Relay contacts (Form-C contacts: NO/NC) for status indication and control
Output Channels	Multipoint relay output points
Mounting Options	Compatible with horizontal (RYH-32) and vertical (RYV-11) nests
Interconnection	Block connector cable for DCS integration
Operating Humidity	5% to 95% RH, non-condensing
Certifications	CE, UL, EMC compliance

Process Control & DCS Instrumentation Properties

The Yokogawa ST7*A utilizes a physical channel-to-channel isolation architecture to prevent inductive kickback voltages from propagating back to the main DCS control processor. The module incorporates distinct Form-C electromechanical relays, providing isolated Normally Open (NO) and Normally Closed (NC) dry contact paths on each output channel. The internal circuitry uses robust trace spacing to maintain signal integrity during concurrent multipoint switching cycles, isolating the solid-state logic supply lines from the field-level load routing infrastructure.

Frequently Asked Questions

Q: What are the primary backplane and electrical limitations regarding hot-swapping or handling individual cards?

A: The module must be powered down or isolated from the live busbar nest prior to physical removal. Standard legacy nest housings (RYH-32 / RYV-11) do not support unassisted hot-swapping for this specific module type without breaking logic current loops, which can result in an unexpected system status interrupt.

Q: How is input power handled across the varying hardware mounting configurations?

A: The module does not regulate voltage internally from a single source; instead, the operating voltage is derived directly from the integrated mounting nest. The unit accepts either 24 VDC +-10%, 85-132 VAC, or 170-264 VAC depending entirely on the electrical rail configuration of the active RYH-32 or RYV-11 enclosure.

Q: What maintenance protocol is required for the output contact stages?

A: The Form-C contacts are mechanical switching elements subject to contact erosion and mechanical degradation. Periodic inspection using standard resistance verification is required to identify oxide accumulation or stuck contacts across the multipoint matrix.

Field Installation Guidelines

Nest Installation: Align the circuit board with the guide rails of the designated horizontal RYH-32 or vertical RYV-11 nest assembly. Slide the module backward until the rear block connector mates completely with the passive terminal bus, then tighten all physical lock screws.
Cable Strain Relief: Secure the block connector cable to the cabinet tie-down bar. Ensure that the total weight of the external field wire bundle does not apply vertical or horizontal tension to the module terminal face.
Inductive Load Suppression: Install external arc-suppression components (diodes for DC loads, RC snubbers for AC loads) directly across all external field inductive devices. This step protects the internal Form-C mechanical relay points from premature degradation caused by inductive voltage transients.
Wire Separation Conduct: Route all field-level contact execution wiring through distinct wire ducts separated by at least 15 cm from low-voltage analog signal wires (such as 4-20 mA or thermocouple lines) to prevent capacitive noise coupling.

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