FCA4 B Yokogawa CENTUM VP Datasheet & Technical Manual

Yokogawa FCA4 B CENTUM VP Universal I/O Module

Yokogawa FCA4 B CENTUM VP Universal I/O Module

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Yokogawa FCA4 B Universal Module The Yokogawa FCA4 B, also cataloged as the FCA4 Universal Input/Output Module, operates as a...

Código: FCA4*B

Manufacturer: Yokogawa
Product No.: FCA4*B
Product Type: Universal Input/Output Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 130g
Shipping port: Xiamen
Warranty: 12 months

Descripción Reseñas

Yokogawa FCA4 B Universal Module

The Yokogawa FCA4 B, also cataloged as the FCA4 Universal Input/Output Module, operates as a dedicated hardware component for signal distribution and isolated loop power provisioning within CENTUM VP and CS 3000 platforms. Configured for analog and discrete signal handling, the module interfaces with field instrumentation, executing loop power stabilization and signal duplication directly to the system backplane interface.

Hardware Specifications

Parameter	Specification
Model	FCA4 B
Brand	Yokogawa
Origin	Japan
Weight	0.13 kg
Dimensions	72.0 mm x 24.0 mm x 127.0 mm
Operating Temp	0 to 50 deg C
Power Consumption	~65 mA at 24 VDC
Input Signal	4-20 mA DC from two-wire transmitter
Output Signal Options	4-20 mA DC or 1-5 V DC
Transmitter Power Supply	26.5 plus or minus 1.5 VDC (current limited 25-35 mA)
Maximum Input Current	40 mA DC
Load Resistance (Current)	Less than or equal to 750 ohm
Load Resistance (Voltage)	Greater than or equal to 250 kohm
Accuracy	plus or minus 0.1% of span
Withstand Voltage	500 VAC for 1 min (input/output vs. power supply)
Insulation Resistance	Greater than or equal to 100 Mohm at 500 VDC
Housing Material	ABS resin

Process Control & Transmitter Loop Regulation

The interface module delivers an isolated current-limited excitation voltage between 25 mA and 35 mA to regulate external two-wire loops. The onboard circuit extracts the 4-20 mA DC process variable and executes linear conversion into a proportional 1-5 VDC or 4-20 mA DC output rail. Galvanic isolation barriers rated up to 500 VAC stand between the field loop inputs, outputs, and internal system power blocks. This structural segmentation keeps common-mode noise, field grounding loops, and transient surges from entering the main distributed control system processors, preventing control degradation.

Frequently Asked Questions

Q: How does the internal current-limiting circuit respond if a dead short occurs on the field transmitter wiring?

A: The module activates its current-limiting mechanism instantly, capping the maximum output current between 25 mA and 35 mA. This hardware action prevents overcurrent down the module line, protects the internal transformer components, and allows the module to resume regular loops as soon as the field short is cleared.

Q: Can this unit drive both a current output and a voltage output simultaneously from a single input?

A: No. The internal output routing must be configured exclusively for either a 4-20 mA DC current loop or a 1-5 VDC voltage signal path. Running both outputs at the same time shifts impedance matching boundaries outside the specified plus or minus 0.1% accuracy span.

Field Installation Guidelines

Wiring Terminations: Connect all field instrumentation leads to the assigned pressure clamp terminal block points. To maintain appropriate signaling properties, verify that the external load on current outputs does not exceed 750 ohm.
Shield Grounding Protocol: Terminate all incoming instrument twisted-pair cable shields at the designated enclosure ground bar. Keep shields continuous across junctions and insulate them at the instrument housing to prevent ground current loops.
DIN Rail and Enclosure Alignment: Snap the module housing directly onto a standard symmetric DIN rail or insert it into a rack panel bay. Ensure the cooling vents located on the top and bottom of the ABS resin frame remain unobstructed by adjacent trunking to preserve natural thermal dissipation.

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