Configured for high-speed network communication in CENTUM VP and ProSafe-RS control platforms, the Yokogawa SEC402-51 S1 (SEC402 ESB Bus Coupler Module) provides direct physical/electrical execution. The unit links safety and process node racks over dual redundant Ethernet communication channels, executing real-time data transfers across backplane architectures. Featuring integrated hardware diagnostic indicators and 1500 VAC dielectric isolation, the module maintains continuous inter-rack communication across distributed control loops.
| Parameter | Specification |
|---|---|
| Model | SEC402-51 S1 |
| Brand | Yokogawa |
| Origin | USA / Japan |
| Weight | 0.34 - 0.40 kg (2.0 kg shipping weight) |
| Dimensions | 32 mm x 106 mm x 130 mm |
| Operating Temp | -20 to 60 deg C |
| Power Consumption | ~400 mA at 5 VDC (backplane supplied) |
| Protocols | Vnet/IP, Ethernet TCP/IP |
| Bus Interface | Dual redundant Ethernet ports (RJ-45) |
| Data Rate | 100 Mbps full duplex |
| Operating Humidity | 10 to 95% RH (non-condensing) |
| Isolation Voltage | 1500 VAC between communication paths and logic for 1 minute |
Yokogawa process control platforms depend on isolation barriers to prevent field-side voltage transients and loop interference from reaching central system processors. The SEC402-51 S1 incorporates 1500 VAC galvanic isolation between communication bus lines and internal backplane logic. Operating alongside 4-20 mA HART analog loops and digital I/O networks, this isolation prevents ground loop current propagation and maintains signal integrity across redundant system nodes.
Q: How does the SEC402-51 S1 maintain bus communication if one network cable fails? A: The module incorporates dual redundant RJ-45 Ethernet ports to instantly reroute data traffic across the secondary path without interrupting control execution.
Q: What power rail supplies operating current to the SEC402-51 S1 module? A: The module draws operating power directly from the system backplane 5 VDC rail, consuming approximately 400 mA under full load.
Q: What diagnostic capabilities indicate active hardware communication errors? A: Integrated front-panel LED indicators and internal firmware error detection circuits continuously monitor bus traffic to report port status and link faults.
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