Yokogawa SEC401-51 ProSafe-RS ESB Bus Coupler Module
Configured for high-speed deterministic bus communications in ProSafe-RS safety instrumented systems, the Yokogawa SEC401-51 (SEC401 ESB Bus Coupler Module) provides direct physical/electrical execution.
Suffix Breakdown & Model Matrix
| Code | Option / Specification | Description |
|---|---|---|
| SEC401 | Base Model | ESB Bus Coupler Module |
| -5 | Protection Type | Standard type with no explosion protection |
| 1 | Environmental Coating | With ISA Standard G3 conformal coating |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SEC401-51 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.24 kg (Net), 1.5 kg (Shipping) |
| Dimensions | Standard rack-mounted module enclosure |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | 0.5 A (Current Consumption) |
| Functional Type | ESB Bus Coupler Module / Safety Node Controller |
| Transmission Speed | 128 Mbps (I/O module data transmission) |
| Transmission Distance | 10 m maximum |
| Connectable Node Units | 9 units maximum |
| Environmental Protection | ISA Standard G3 conformal coating |
| Isolation | Optical isolation via ESB bus |
| Safety Integrity Level | SIL3 (IEC 61508 Certified) |
Process Control and DCS Connectivity
The SEC401-51 coupler module connects safety node units over the ESB bus, transferring high-speed process data at 128 Mbps across 10 m spans. The card preserves channel-to-channel isolation to isolate control logic from field-induced electrical transients. Dedicated circuitry integrates seamlessly with 4-20 mA HART loops and FOUNDATION Fieldbus field instruments, maintaining deterministic cycle times and SIL3 safety loop execution under continuous operation.
Frequently Asked Questions
Q: How many safety node units can a single SEC401-51 bus coupler support?
A: The SEC401-51 module supports inter-node communication for up to 9 connected safety node units maximum over the ESB bus interface.
Q: What environmental protection standard applies to the SEC401-51 module?
A: The unit features factory-applied ISA Standard G3 conformal coating to protect internal electronic circuits against corrosive industrial atmospheres.
Field Installation Guidelines
Insert the SEC401-51 vertically into the designated slot of the main safety node unit chassis, pushing firmly until backplane bus pins seat fully. Fasten the top and bottom retaining screws to establish chassis ground continuity. Verify that total ESB bus cable runs do not exceed the maximum allowable distance of 10 m. Route communication cabling through dedicated low-voltage instrument ducts separate from AC power conduits to maintain signal clarity.
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