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Copy| Product Name | Yokogawa EC402-50 S1 ESB Bus Coupler Module |
| Item NO. | 2928967 |
| Weight | 0.1 kg = 0.2205 lb = 3.5274 oz |
| Category | YOKOGAWA |
| Brand | YOKOGAWA |
| Creation Time | 2026-11-01 |
Yokogawa EC402-50 S1 is a two-port ESB Bus Coupler Module for CENTUM VP Field Control Units. It acts as the ESB bus master interface, transferring I/O module data between a supported FCU and the node units connected on its upper and lower routes.
Through CN1 and CN2, Yokogawa EC402-50 S1 separates the ESB network into identifiable upper and lower branches. Each connector carries its assigned node-unit chain, while the FCU receives both branches through the module rather than through separate controller communication hardware.
Installed in slot 7, Yokogawa EC402-50 S1 can operate as the single ESB interface; fitting a second module in slot 8 creates the supported dual-redundant master arrangement. The -50 code identifies the standard execution without explosion protection and the basic option without ISA Standard G3 treatment.
| Technical Item | Specification |
|---|---|
| Brand | Yokogawa |
| Model | EC402-50 S1 |
| Nameplate Suffix | S1 (commonly seen nameplate marking) |
| Product Name | ESB Bus Coupler Module (for N-IO/FIO, 2-Port) |
| Country | Japan |
| Primary Function | ESB bus master interface between an FCU and node units |
| Supported FCUs | AFV30S/D, AFV40S/D, A2FV50S/D and A2FV70S/D |
| Installation Slots | Slot 7 alone; slots 7 and 8 for dual-redundant operation |
| ESB Bus Ports | 2 front ports: CN1 upper and CN2 lower |
| Transmission Speed | 128 Mbps for I/O module data |
| Connectable Units | Up to 9 upper and 9 lower node units |
| Cable Distance | 10 m upper + 10 m lower; 20 m total maximum |
| Current Consumption | 0.5 A |
| Ordering Code | -5 = standard type without explosion protection; 0 = basic type |
| Dimensions (W × H × D) | 32.8 × 130 × 129.5 mm |
| Weight | Approx. 0.24 kg |
The FCU transfers node-unit I/O data through Yokogawa EC402-50 S1. The module is the common master interface for both front connector paths, keeping the controller-side exchange separate from field wiring at individual I/O modules.
CN1 carries the upper ESB chain. Cable checks can remain focused on that route when the lower branch continues to communicate normally.
CN2 carries the lower ESB chain. Its separate connector preserves branch identity from the coupler to the connected node units.
Check that EC402-50 S1 is the standard, basic-type module required for the project and that the selected FCU is one of the supported installations.
Use slot 7 for a single module. For the dual-redundant arrangement, reserve slots 7 and 8 and keep both couplers associated with the same FCU.
Connect the upper node chain to CN1 and the lower node chain to CN2. Keep the documented distance and connected-unit limits for each branch.
Restore the system under the site procedure, confirm both branch paths are recognized and investigate any failed route without disturbing the communicating branch.
Yokogawa EC402-50 S1 occupies slot 7 for a single-module arrangement. A dual-redundant arrangement uses Yokogawa EC402-50 S1 modules in slots 7 and 8.
Yokogawa EC402-50 S1 labels CN1 as the upper ESB route and CN2 as the lower route, keeping the two node-unit branches identifiable during wiring and checks.
Yes. Two Yokogawa EC402-50 S1 modules can form the dual-redundant ESB interface when both designated FCU slots are used and the two bus routes are wired as the system design requires.
For Yokogawa EC402-50 S1, verify the affected upper or lower connector, the cable path, the connected node-unit chain and the FCU slot status before changing the unaffected branch.
Yokogawa EC402-50 S1 supports up to nine connected units on the upper route and nine on the lower route under the standard connection arrangement.
On Yokogawa EC402-50 S1, the 5 identifies the standard execution without explosion protection and the final 0 identifies the basic type without the ISA Standard G3 option.
Moore Automation maintains a multi-brand industrial automation reference range covering Yokogawa control hardware, PLC and DCS modules, communication parts, I/O and condition-monitoring components. The scope includes ABB, Yokogawa, Siemens, Honeywell, Emerson, Foxboro, Triconex, Bently Nevada, Schneider Electric and GE.
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