Introduction
The STBNIP2311 is a standard dual-port network interface module (NIM) from Schneider Electric’s Advantys STB series. It connects an Advantys STB island to an Ethernet Modbus TCP/IP network, acting as the communication head for distributed I/O. If you run an existing Advantys STB installation, this module is the bridge between your field devices and your control system.
Schneider Electric has discontinued this module, superseded by the Modicon X80 range. That makes availability limited and replacement planning essential. SpareTechPLC helps you secure remaining stock or map a clear upgrade path before downtime forces the decision.
Technical Specifications
Dual-Port Ethernet with Auto MDIX
The STBNIP2311 provides two RJ45 ports with auto MDIX, so you can daisy-chain islands or build a simple redundant ring without crossover cables. Both ports support 10/100 Mbit/s at half or full duplex, matching the speed of most industrial switches and PLC backplanes.
Modbus TCP/IP and Embedded Web Services
The module speaks Ethernet Modbus TCP/IP over IEEE 802.3. It also hosts an embedded web server plus BootP/DHCP, SNMP, and HTTP services. That means you can assign IP addresses automatically, monitor island status through a browser, and integrate the island into existing network management tools without extra software.
Power and Logic Bus Output
The STBNIP2311 runs on 24V DC (SELV) and draws 430 mA. It supplies a logic bus output of 5.25V DC (±0.21%) at 1.2 A nominal, dropping to 0.575 A at 60-70 °C. This output powers the I/O modules on the island, so the current budget directly limits how many modules you can install.
Island Capacity
One primary segment supports up to six extensions, and the island addresses up to 32 I/O modules. A removable memory card stores the I/O configuration, which simplifies module replacement — you can swap hardware without reconfiguring from scratch.
Physical and Environmental
The module measures 128.3 × 70 × 40.5 mm and weighs 0.13 kg. It carries an IP20 protection rating, so it belongs inside a control cabinet. Seven LEDs (ACT, RUN, ERR, MS, NS, PWR, TEST) give fast visual status for power, network, and module health.
Replacement and Upgrade Guide
Because Schneider Electric discontinued the STBNIP2311 and points users to the Modicon X80 range, anyone maintaining an Advantys STB island faces a clear choice: keep the existing island running with spare parts, or migrate to the newer platform.
Staying with the STBNIP2311 makes sense when your island is stable, your I/O count is modest, and your network already runs Modbus TCP/IP. The removable memory card helps here — you can restore configuration quickly after a module swap. SpareTechPLC can help you source remaining units so you avoid unplanned downtime.
Migrating to Modicon X80 suits sites that need a supported lifecycle, newer diagnostics, or tighter integration with current Schneider control platforms. The migration takes planning: you must map existing I/O, confirm network settings, and schedule a controlled cutover. The STBNIP2311’s 32-module address limit and six-extension cap define the scope of what you are replacing.
Installation and Setup
Mount the module inside a cabinet that respects the IP20 rating. Keep the 24V DC (SELV) supply within specification and confirm your input current budget of 430 mA. Use the dual RJ45 ports for your network connection, and let auto MDIX handle cable polarity.
Before powering up, set the IP address method — BootP, DHCP, or a fixed address through the embedded web server. Insert the removable memory card with your I/O configuration so the island recognizes its modules on startup. Verify the seven LEDs after power-up: PWR and RUN should show normal operation, while ERR, MS, and NS help you diagnose network or module faults.
Maintenance and Reliability
Inspect the module periodically for loose connections, dust buildup, and cabinet temperature. The logic bus output drops from 1.2 A to 0.575 A at 60-70 °C, so thermal management matters — keep the cabinet within a range that avoids derating. Check the LEDs during routine rounds; a persistent ERR or NS indication points to a network or configuration issue before it becomes a stoppage.
The removable memory card is a practical reliability feature. Keep a known-good configuration on hand so a replacement module can be restored quickly. Because the product is discontinued, treat every working unit as a critical spare and plan replacements before failures occur.
Compatibility and Integration
The STBNIP2311 integrates with Ethernet Modbus TCP/IP networks and IEEE 802.3 infrastructure. It supports BootP/DHCP for address assignment, SNMP for network monitoring, and HTTP for browser-based access. The embedded web server lets technicians check status without a programming terminal.
Within the Advantys STB system, the module manages one primary segment and up to six extensions, addressing up to 32 I/O modules. That architecture suits distributed I/O islands where field devices sit far from the main controller.
Selection Guide
Before buying, confirm your island’s I/O count stays within the 32-module limit and that your network uses Modbus TCP/IP. Check that your cabinet respects the IP20 rating and that your 24V DC supply can deliver the required current. Verify whether you need the removable memory card for configuration storage.
Because the STBNIP2311 is discontinued, ask SpareTechPLC about current availability and Modicon X80 alternatives. A reliable supplier can confirm stock, condition, and whether a direct replacement or migration plan fits your timeline.
FAQs
Is the STBNIP2311 still in production?
No. Schneider Electric discontinued it and superseded it with the Modicon X80 range. Contact SpareTechPLC to check remaining availability.
What network protocol does the STBNIP2311 use?
It uses Ethernet Modbus TCP/IP over IEEE 802.3, with 10/100 Mbit/s and half/full duplex support.
How many I/O modules can one island address?
Up to 32 I/O modules across one primary segment and a maximum of six extensions.
What is the logic bus output rating?
5.25V DC (±0.21%) at 1.2 A nominal, derated to 0.575 A at 60-70 °C.
Can I migrate to Modicon X80 instead of replacing the STBNIP2311?
Yes. Migration is a valid path when you need a supported lifecycle. Plan the I/O mapping and cutover carefully.
