Configured for data acquisition and signal processing in CENTUM CS 3000 networks, the Yokogawa CNB-IIA (CNB-IIA DCS Interface Module) provides direct physical/electrical execution.
Hardware Specifications
Parameter
Specification
Model
CNB-IIA
Brand
Yokogawa
Origin
USA
Weight
Unspecified
Dimensions
Compact rack/panel mount footprint
Operating Temp
-10 to 55 deg C
Storage Temp
Unspecified
Humidity
5 to 95 percent RH, non-condensing
Power Supply
24 VDC nominal
Power Consumption
Unspecified
Communication Interfaces
Ethernet, RS-485 (configuration dependent)
System Compatibility
CENTUM CS 3000, CENTUM VP
Environmental Protection
Anti-dust and anti-moisture treatment
Certifications
CE, UL, RoHS compliant
Process Control Signal Integration and Isolation Architecture
Executes high-integrity data acquisition and protocol conversion between field-side instrumentation and central processing logic units across DCS bus structures.
Integrates channel-to-channel isolation hardware to isolate processing circuits from earth loop currents, common-mode noise, and transient field voltage spikes.
Supports transparent pass-through for 4-20 mA HART loop protocol parameters across connected analog field device communication paths.
Frequently Asked Questions
Q: What primary communication interfaces are supported on the CNB-IIA interface module?
A: The module supports Ethernet and RS-485 serial communication protocols, depending on the specific hardware backplane configuration.
Q: How does the CNB-IIA module protect signal channels from ground loop interference?
A: Internal channel-to-channel isolation circuitry decouples field-side signal paths from the logic processing bus, preventing circulating currents.
Q: What power input voltage is required for operating the CNB-IIA interface assembly?
A: The module operates on a standard industrial supply rating of 24 VDC.
Field Installation Guidelines
Secure the module into the designated rack or panel enclosure slot, ensuring side lock levers fully engage the mounting frame.
Ground all communication and field wiring cable shields to a single dedicated point on the cabinet low-impedance earth bar.
Maintain physical isolation between high-voltage power lines and low-voltage signal/communication cables within panel wire ducts.
Verify that ambient airflow around the module remains unblocked to ensure passive thermal dissipation within the -10 to 55 deg C operating limit.
