Yokogawa SEC401-11 S3 Bus Coupler Module
Configured for I/O expansion and bus extension in CENTUM VP and ProSafe-RS control platforms, the Yokogawa SEC401-11, also cataloged as the SEC401 S3 Bus Coupler Module, provides direct physical/electrical execution. The rack-mounted hardware functions as the communication interface extending S3 bus and ESB bus links between Field Control Stations (FCS) and remote I/O units. Integrated signal conditioning and galvanic isolation provide noise immunity and real-time synchronization across high-density I/O nests.
Suffix Breakdown & Model Matrix
| Suffix Code | Option Specification |
|---|---|
| -1 | Standard Type |
| 1 | Style 1 Hardware Revision |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SEC401-11 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.22 kg to 1.5 kg (Chassis node configuration: 7 - 9 kg) |
| Dimensions | 32 mm x 106 mm x 130 mm (Chassis unit: 482.6 mm x 266 mm x 88.1 mm) |
| Operating Temp | 0 deg C to +55 deg C |
| Power Consumption | 150 mA @ 5 V DC internal (24 V DC backplane supplied) |
| Bus Architecture | S3 (Synchronous Serial Single) / ESB Bus Interface |
| Safety Level | SIL3 compliant (IEC 61508) |
| Module Slots | Supports up to 8 I/O modules plus CPU/communication modules |
| Isolation Voltage | Galvanic isolation between S3 bus and internal system logic |
4-20 mA HART Loop Protocol & Channel-to-Channel Isolation
The SEC401-11 module maintains low-latency bus extension across racks hosting 4-20 mA HART loop protocol analog cards and high-density digital I/O nodes. Galvanic isolation barriers eliminate ground loop currents between remote I/O nests and the main controller backplane. This isolation prevents electrical noise from distorting sensitive analog process variables and preserves cold junction compensation (CJC) accuracy on adjacent thermocouple input cards.
Frequently Asked Questions
Q: How does the SEC401-11 receive operating power within the I/O node?
A: The module draws power directly from the 24 V DC system backplane, consuming 150 mA at 5 V DC for its internal logic circuits.
Q: What network interface does the SEC401-11 support for module expansion?
A: It utilizes the Synchronous Serial Single (S3) bus architecture and ESB bus interfaces to synchronize data across distributed expansion racks.
Field Installation Guidelines
Slot the SEC401-11 directly into its designated I/O bus interface slot within the FCS rack or node chassis. Secure top and bottom panel lock screws to establish frame grounding and fix the backplane interface connection.
Connect S3 expansion bus cables using factory-terminated shielding. Route bus signal cables away from high-voltage motor wiring and switching power conductors to prevent signal corruption. Ground all cable shields at a single cabinet ground point prior to applying 24 V DC backplane power.
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