YOKOGAWA NCU4*A Node Control Unit Original

Availability: 10 left in stock

YOKOGAWA NCU4*A Node Control Unit The YOKOGAWA NCU4*A, also cataloged as the NCU4*A Node Control Unit, operates as a dedicated...

SKU: NCU4*A

Manufacturer: Yokogawa
Product No.: NCU4*A
Product Type: Node Interface Modules
Product Origin: Japan
Payment:T/T, Western Union
Weight: 300g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

YOKOGAWA NCU4*A Node Control Unit

The YOKOGAWA NCU4*A, also cataloged as the NCU4*A Node Control Unit, operates as a dedicated hardware component for communication gateway execution and local process control within CENTUM VP and ProSafe-RS platform networks.

Hardware Specifications

Parameter	Specification
Model	NCU4*A
Brand	YOKOGAWA
Origin	Singapore
Weight	0.3 kg
Dimensions	130 mm x 100 mm x 35 mm
Operating Temp	-20 deg C to 60 deg C
Power Consumption	24 VDC nominal
Performance	High-speed system bus interface with embedded CPU

Process Control and DCS Connectivity

The NCU4*A functions as the primary node interface between distributed I/O modules and the system controller, utilizing 4-20 mA HART loop protocol standards for precise data interchange. The hardware architecture supports dual-redundant communication and control paths, facilitating high-availability configurations required for safety-critical operations. To maintain signal integrity during high-volume data traffic, the module provides channel-to-channel isolation, effectively mitigating electrical noise coupling into the system bus. Additionally, the unit enables cold junction compensation (CJC) for integrated thermocouple measurements, ensuring high-precision data acquisition during temperature-sensitive process monitoring.

Frequently Asked Questions

Q: Does the NCU4*A support hot-swapping within the I/O rack during system operation?

A: Yes, the module supports hot-swapping; however, verify that the corresponding redundant node is fully synchronized and active before extraction to maintain seamless process control and prevent network communication gaps.

Q: How does the internal watchdog timer respond to process faults?

A: The embedded watchdog timer monitors the cycle execution of the CPU; if the scan time exceeds defined parameters due to a logic hang or hardware fault, the module triggers a fault log entry and initiates a safe-state transition for the associated I/O points.

Field Installation Guidelines

Mount the NCU4*A securely into the designated control rack slot, ensuring the backplane pins are fully seated and the mechanical locking mechanism is engaged. Terminate all system bus and Ethernet cabling to the appropriate ports, ensuring that cable shields are properly bonded to the cabinet ground bus at the entry point to mitigate electromagnetic interference. Verify that the 24 VDC input voltage is stable and within nominal limits before powering the module. After installation, utilize the engineering software to confirm the node link status and verify synchronization of redundant paths before commissioning the unit into the active process control loop.

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