{"product_id":"yokogawa-ec401-11-centum-vp-esb-bus-coupler-module","title":"Yokogawa EC401-11 CENTUM VP ESB Bus Coupler Module","description":"\u003ch2\u003e\u003cspan class=\"qwen-markdown-text\"\u003eProduct Overview\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003e\u003c\/span\u003eThe Yokogawa\u003cstrong\u003e EC401-11 \u003c\/strong\u003eESB Bus Coupler Module provides the critical communication link between Field Control Units (FCU) and distributed Node Units within the CENTUM VP distributed control system. It resolves the challenge of extending high-speed I\/O connectivity to remote or densely packed control cabinets by supporting up to 9 N-IO\/FIO modules over a dedicated 128 Mbps ESB bus. This single-port coupler ensures deterministic, low-latency data transfer essential for fast-loop process control in demanding environments such as refineries, chemical plants, and power generation facilities. With integrated support for explosion-protected and ISA G3 corrosive environment variants, the EC401-11 delivers reliable performance where standard modules would fail.\u003c\/p\u003e\n\u003ch2 class=\"qwen-markdown-heading\"\u003e\u003cspan class=\"qwen-markdown-text\"\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable class=\"qwen-markdown-table\"\u003e\n\u003cthead class=\"qwen-markdown-table-thead\"\u003e\n\u003ctr class=\"qwen-markdown-table-thead-tr firstRow\"\u003e\n\u003cth class=\"qwen-markdown-table-thead-tr-th\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eParameter\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/th\u003e\n\u003cth class=\"qwen-markdown-table-thead-tr-th\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eSpecification\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody class=\"qwen-markdown-table-tbody\"\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eProduct Type\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eESB Bus Coupler Module (Single-Port Master)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eBrand \/ Series\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eYokogawa \/ CENTUM VP\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eModel Number\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eEC401-11 (Style S2)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003ePrimary Function\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eESB Bus Master Interface for FCU-to-Node communication\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eCompatible I\/O Systems\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eN-IO, FIO (Field I\/O) modules\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eConnectable Nodes\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eMaximum 9 I\/O units per coupler\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eTransmission Speed\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003e128 Mbps (dedicated I\/O data channel)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eMax Transmission Distance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003e10 meters between coupler and farthest I\/O unit\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eCurrent Consumption\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003e0.5 A @ 24 VDC (typical operating load)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eWeight\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003e0.24 kg (0.53 lbs)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003ePort Configuration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eSingle-port ESB interface\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eMounting\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eDIN rail or CENTUM VP Node Unit slot\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eEnvironmental Options\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eExplosion protection, ISA-71.04 Grade G3 compliance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"qwen-markdown-table-tbody-tr\"\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eTarget Applications\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"qwen-markdown-table-tbody-tr-td\"\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eHazardous area I\/O expansion, corrosive environment control\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 class=\"qwen-markdown-heading\"\u003e\u003cspan class=\"qwen-markdown-text\"\u003eModel Code Decomposition\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eYokogawa's EC401 series employs a structured suffix system to precisely define safety ratings and environmental certifications. Correct interpretation ensures compliance with facility area classification and process safety requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003ePart Number Structure: EC401-XX\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"qwen-markdown-list list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eEC\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e: Series identifier for CENTUM VP ESB communication modules.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003e401\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e: Functional code specifying the single-port ESB Bus Coupler for N-IO\/FIO systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eSuffix Positions (Two-digit code defines variant):\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cul class=\"qwen-markdown-list list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003e0\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e: Basic type – Standard environmental protection for typical indoor industrial use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003e1\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e: ISA Standard G3 compliant – Meets ISA-71.04 Grade G3 for severe corrosive atmospheres (e.g., high concentrations of H₂S, chlorine, ammonia). Essential for wastewater treatment, chemical processing, and coastal facilities.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003e5 or E\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e: Standard type – No explosion protection. Suitable for general industrial control rooms and non-hazardous areas.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003e1\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e: Explosion-protected type – Certified for installation in hazardous locations where flammable gases, vapors, or combustible dusts may be present (e.g., Zone 2, Class I Div 2).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eFirst Digit (Explosion Protection Classification):\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eSecond Digit (Environmental Compliance):\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eExample: EC401-11\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e = Explosion-protected variant \u003c\/span\u003e\u003cspan class=\"qwen-markdown-strong\"\u003e+\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e ISA G3 corrosive environment compliance. This module is engineered for deployment in hazardous, chemically aggressive areas where both safety and long-term reliability are critical.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"qwen-markdown-heading\"\u003e\u003cspan class=\"qwen-markdown-text\"\u003eInstallation Recommendations and Wiring Guidelines\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eMount the EC401-11 securely in the designated CENTUM VP node slot or on a 35mm DIN rail adjacent to the Field Control Unit. Ensure the module is firmly seated to maintain reliable electrical contact with the backplane. Plan cable routing to stay within the strict\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"qwen-markdown-strong\"\u003e10-meter maximum ESB segment length\u003c\/span\u003e\u003cspan class=\"qwen-markdown-text\"\u003e; exceeding this distance at 128 Mbps will cause communication errors and I\/O scan failures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eUse only Yokogawa-certified shielded twisted-pair ESB cables with locking connectors to prevent accidental disconnection. Terminate the bus with the correct resistor value at the physical end of the segment to eliminate signal reflection. For the explosion-protected (-1) variant, all wiring practices must comply with applicable hazardous location standards (ATEX, IECEx, NEC Article 501\/504), including the use of approved cable glands, seals, and grounding methods to maintain the integrity of the protection concept. Power the module from a regulated 24 VDC supply with sufficient capacity for the 0.5 A load plus connected I\/O units. After installation, verify communication status via the module's LED indicators: steady green confirms successful ESB handshake with the FCU, while amber or blinking patterns indicate configuration errors, cable faults, or termination issues. Perform a loopback test using Vx-Toolset engineering software before system commissioning to validate end-to-end I\/O scanning performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 class=\"qwen-markdown-heading\"\u003e\u003cspan class=\"qwen-markdown-text\"\u003eFrequently Asked Questions (FAQ)\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eQ: What is the difference between EC401-10 and EC401-11?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eA: Both are single-port ESB couplers for N-IO\/FIO systems. The key difference lies in the suffix: EC401-10 typically denotes a standard or basic environmental variant, while EC401-11 specifically indicates ISA Standard G3 compliance for severe corrosive environments. Always verify the full suffix against your facility's environmental and area classification requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eQ: Can I connect more than 9 I\/O modules to a single EC401-11?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eA: No. The 9-unit limit is a hard constraint of the ESB protocol electrical specification and timing budget at 128 Mbps. Exceeding this number will cause communication instability and unpredictable I\/O behavior. For larger I\/O counts, deploy additional EC401-11 modules in separate node slots or consider a dual-port coupler variant like the SEC402 series.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eQ: Is the EC401-11 hot-swappable?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eA: Yes, when installed in a CENTUM VP system with redundant configuration and proper engineering settings. However, best practice is to place the associated Field Control Station in maintenance mode via the engineering station before physical replacement to avoid transient I\/O communication alarms and potential process upsets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eQ: How does ISA G3 compliance benefit my installation?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eA: ISA-71.04 Grade G3 certification means the module's circuit board and components are protected against severe corrosive gases and particulates. This significantly extends service life and reduces failure risk in environments like chemical plants, pulp\/paper mills, wastewater facilities, or coastal installations where sulfur compounds, chlorides, or ammonia are present.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-strong\"\u003eQ: Can I use standard Ethernet cable for the ESB connection?\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"qwen-markdown-text\"\u003eA: No. The ESB bus uses a proprietary physical layer and signaling protocol distinct from Ethernet. You must use Yokogawa-specified ESB cables with the correct impedance, shielding, and connector types. Substituting standard Cat5e\/6 cable will result in communication failure and may damage the module.\u003c\/span\u003e\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":52522707747125,"sku":"EC401-11","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/EC401-11.jpg?v=1775031664","url":"https:\/\/www.5gplc.com\/products\/yokogawa-ec401-11-centum-vp-esb-bus-coupler-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}