YOKOGAWA SEC402-51 Coupler Module
Configured for high-speed deterministic bus signal coupling in CENTUM VP control station nodes, the Yokogawa SEC402-51 (SEC402 ESB Bus Coupler Module) provides direct physical/electrical execution. It establishes the primary communication interface between the main processor unit and remote ESB bus node interface units, driving high-frequency differential signals across dedicated backplane topologies without introducing packet transmission jitter or protocol parsing overhead.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SEC402-51 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.85 kg (Shipping Weight: 2.00 kg) |
| Dimensions | 130 mm x 30 mm x 125 mm |
| Operating Temp | 0 to 50 deg C |
| Power Consumption | 5.0 VDC @ 0.9 A (4.5 W nominal) |
| Module Type | ESB Bus Coupler Module |
| Bus Transmission Speed | 128 Mbps |
| Maximum Transmission Distance | 10 m (via dedicated ESB bus cable) |
| Redundancy Support | Dual-redundant configuration supported |
| Channel Isolation | Galvanic isolation via bus pulse transformers |
Cold Junction Compensation and Channel-to-Channel Isolation
The SEC402-51 operates within Yokogawa CENTUM architectures where analog signal integrity relies on strict channel-to-channel isolation and accurate cold junction compensation (CJC) executed at downstream I/O nodes. To prevent ground loops from corrupting 4-20 mA HART loop protocol paths and millivolt-level thermocouple inputs, the module utilizes high-density transformer isolation across its internal ESB bus transceiver circuitry. This design isolates backplane logic power from field-side noise propagation. When interfacing with remote thermal input modules, the high-speed 128 Mbps ESB bus payload maintains microsecond-level synchronization to transmit digitized CJC reference voltages across the rack backplane, ensuring zero phase shift during real-time Process Variable (PV) processing.
Frequently Asked Questions
Q: Does the SEC402-51 support online replacement (hot-swapping) while the control node is powered?
A: Yes. The module is designed for hot-swap installation in dual-redundant ESB bus configurations. When replacing a faulty SEC402-51, the standby coupler automatically maintains active communication link state without causing node reset or interrupting backplane traffic.
Q: What are the physical cabling constraints for connecting the SEC402-51 to remote I/O nodes?
A: The SEC402-51 must connect using dedicated Yokogawa YCB301 ESB bus cables. Total cable length per bus segment must not exceed 10 m to preserve 128 Mbps signal integrity and prevent impedance mismatch reflections.
Field Installation Guidelines
- Power off the target slot or verify that the redundant bus coupler is fully active prior to inserting or removing the SEC402-51 module.
- Align the module circuit board with the upper and lower guide rails of the dedicated CENTUM CPU node chassis slot.
- Push the module firmly into the slot until the backplane multi-pin connector seats completely. Tighten the top and bottom retaining screws to 0.5 Nm to secure mechanical grounding.
- Connect the YCB301 ESB bus cable to the front-panel connector. Ensure the cable locking mechanism snaps completely into place to prevent accidental vibration disconnects.
- Verify ground continuity by connecting the cable shield drainage wire directly to the cabinet functional earth (FE) bus bar with a minimum conductor gauge of 2.0 mm2.
YOKOGAWA SEC402-51 Coupler Module
YOKOGAWA SEC402-51 Coupler Module
Configured for high-speed deterministic bus signal coupling in CENTUM VP control station nodes, the Yokogawa SEC402-51 (SEC402 ESB Bus Coupler Module) provides direct physical/electrical execution. It establishes the primary communication interface between the main processor unit and remote ESB bus node interface units, driving high-frequency differential signals across dedicated backplane topologies without introducing packet transmission jitter or protocol parsing overhead.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SEC402-51 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.85 kg (Shipping Weight: 2.00 kg) |
| Dimensions | 130 mm x 30 mm x 125 mm |
| Operating Temp | 0 to 50 deg C |
| Power Consumption | 5.0 VDC @ 0.9 A (4.5 W nominal) |
| Module Type | ESB Bus Coupler Module |
| Bus Transmission Speed | 128 Mbps |
| Maximum Transmission Distance | 10 m (via dedicated ESB bus cable) |
| Redundancy Support | Dual-redundant configuration supported |
| Channel Isolation | Galvanic isolation via bus pulse transformers |
Cold Junction Compensation and Channel-to-Channel Isolation
The SEC402-51 operates within Yokogawa CENTUM architectures where analog signal integrity relies on strict channel-to-channel isolation and accurate cold junction compensation (CJC) executed at downstream I/O nodes. To prevent ground loops from corrupting 4-20 mA HART loop protocol paths and millivolt-level thermocouple inputs, the module utilizes high-density transformer isolation across its internal ESB bus transceiver circuitry. This design isolates backplane logic power from field-side noise propagation. When interfacing with remote thermal input modules, the high-speed 128 Mbps ESB bus payload maintains microsecond-level synchronization to transmit digitized CJC reference voltages across the rack backplane, ensuring zero phase shift during real-time Process Variable (PV) processing.
Frequently Asked Questions
Q: Does the SEC402-51 support online replacement (hot-swapping) while the control node is powered?
A: Yes. The module is designed for hot-swap installation in dual-redundant ESB bus configurations. When replacing a faulty SEC402-51, the standby coupler automatically maintains active communication link state without causing node reset or interrupting backplane traffic.
Q: What are the physical cabling constraints for connecting the SEC402-51 to remote I/O nodes?
A: The SEC402-51 must connect using dedicated Yokogawa YCB301 ESB bus cables. Total cable length per bus segment must not exceed 10 m to preserve 128 Mbps signal integrity and prevent impedance mismatch reflections.
Field Installation Guidelines
- Power off the target slot or verify that the redundant bus coupler is fully active prior to inserting or removing the SEC402-51 module.
- Align the module circuit board with the upper and lower guide rails of the dedicated CENTUM CPU node chassis slot.
- Push the module firmly into the slot until the backplane multi-pin connector seats completely. Tighten the top and bottom retaining screws to 0.5 Nm to secure mechanical grounding.
- Connect the YCB301 ESB bus cable to the front-panel connector. Ensure the cable locking mechanism snaps completely into place to prevent accidental vibration disconnects.
- Verify ground continuity by connecting the cable shield drainage wire directly to the cabinet functional earth (FE) bus bar with a minimum conductor gauge of 2.0 mm2.
