Yokogawa CNB-IIA CENTUM CS 3000 Communication Module
The Yokogawa CNB-IIA, also cataloged as the CNB-IIA Communication Module, operates as a dedicated hardware component for real-time signal acquisition and bus data transfer within CENTUM CS 3000 and CENTUM VP platforms. It manages signal routing and data transfer between field analog/digital I/O channels and central processor units, maintaining dual-redundant link continuity for critical field telemetry.
Suffix Breakdown & Model Matrix
| Base Model | Suffix / Option | Technical Description |
|---|---|---|
| CNB-IIA | Standard | Base communication module for CENTUM CS 3000 and CENTUM VP systems |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | CNB-IIA |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | Standard modular weight |
| Dimensions | Standard Yokogawa card rack dimensions |
| Operating Temp | 0 deg C to +55 deg C |
| Power Consumption | Standard backplane power allocation |
| Product Type | Communication Modules |
| Compatible Systems | CENTUM CS 3000, CENTUM VP |
| Protocol Support | HART protocol, Analog/Digital I/O bus protocol |
| Redundancy | Dual-redundant module pairing support |
4-20 mA HART & Channel-to-Channel Isolation
The Yokogawa CNB-IIA communication module provides channel-to-channel isolation parameters across internal bus pathways to prevent field-side common-mode voltage spikes and electrical noise from interfering with central control logic. Designed for dual-redundant installations with HART-enabled analog I/O cards, the module maintains continuous HART digital signal pass-through and loop data synchronization across redundant communication channels without signal attenuation.
Frequently Asked Questions
Q: Does the CNB-IIA communication module support hot-swap replacement in a redundant configuration?
A: Yes, in a dual-redundant configuration, a faulty CNB-IIA module can be removed and replaced under rack backplane power without interrupting active communication on the secondary module.
Q: How does the CNB-IIA manage HART protocol signals from field transmitters?
A: The module transparently passes HART frequency-shift keying (FSK) digital signals super-imposed on 4-20 mA current loops directly to the DCS controller without disturbing primary analog process variable values.
Field Installation Guidelines
- Verify system backplane power levels are within operating tolerances prior to inserting the CNB-IIA module into the designated card nest slot.
- Ensure both primary and secondary modules are firmly locked into the subrack chassis when configuring a dual-redundant communication pair.
- Keep all communication signal cabling routed separately from high-voltage AC lines and high-current motor control wiring, maintaining a minimum clearance of 200 mm.
- Terminate all field communication cable shields at a single point on the main enclosure ground bar to prevent ground potential loops from degrading signal integrity.
Yokogawa CNB-IIA CENTUM CS 3000 Communication Module
Yokogawa CNB-IIA CENTUM CS 3000 Communication Module
The Yokogawa CNB-IIA, also cataloged as the CNB-IIA Communication Module, operates as a dedicated hardware component for real-time signal acquisition and bus data transfer within CENTUM CS 3000 and CENTUM VP platforms. It manages signal routing and data transfer between field analog/digital I/O channels and central processor units, maintaining dual-redundant link continuity for critical field telemetry.
Suffix Breakdown & Model Matrix
| Base Model | Suffix / Option | Technical Description |
|---|---|---|
| CNB-IIA | Standard | Base communication module for CENTUM CS 3000 and CENTUM VP systems |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | CNB-IIA |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | Standard modular weight |
| Dimensions | Standard Yokogawa card rack dimensions |
| Operating Temp | 0 deg C to +55 deg C |
| Power Consumption | Standard backplane power allocation |
| Product Type | Communication Modules |
| Compatible Systems | CENTUM CS 3000, CENTUM VP |
| Protocol Support | HART protocol, Analog/Digital I/O bus protocol |
| Redundancy | Dual-redundant module pairing support |
4-20 mA HART & Channel-to-Channel Isolation
The Yokogawa CNB-IIA communication module provides channel-to-channel isolation parameters across internal bus pathways to prevent field-side common-mode voltage spikes and electrical noise from interfering with central control logic. Designed for dual-redundant installations with HART-enabled analog I/O cards, the module maintains continuous HART digital signal pass-through and loop data synchronization across redundant communication channels without signal attenuation.
Frequently Asked Questions
Q: Does the CNB-IIA communication module support hot-swap replacement in a redundant configuration?
A: Yes, in a dual-redundant configuration, a faulty CNB-IIA module can be removed and replaced under rack backplane power without interrupting active communication on the secondary module.
Q: How does the CNB-IIA manage HART protocol signals from field transmitters?
A: The module transparently passes HART frequency-shift keying (FSK) digital signals super-imposed on 4-20 mA current loops directly to the DCS controller without disturbing primary analog process variable values.
Field Installation Guidelines
- Verify system backplane power levels are within operating tolerances prior to inserting the CNB-IIA module into the designated card nest slot.
- Ensure both primary and secondary modules are firmly locked into the subrack chassis when configuring a dual-redundant communication pair.
- Keep all communication signal cabling routed separately from high-voltage AC lines and high-current motor control wiring, maintaining a minimum clearance of 200 mm.
- Terminate all field communication cable shields at a single point on the main enclosure ground bar to prevent ground potential loops from degrading signal integrity.
