Description
The listed Schneider Electric SR3MBU01BD, SR3NET01BD, SR3B262BD, SR3XT61B / BD / FU are communication modules, smart relays (Zelio Logic SR3/SR2 series), and expansion I/O modules for the Zelio Logic compact PLC / Smart Relay family:
- SR3MBU01BD → Modbus RS-485 Communication Module for Zelio Logic SR2/SR3 — adds Modbus RTU slave capability (RS-485 2-wire) so the Zelio can be polled by a PLC, SCADA, HMI or Modbus master. Also enables Zelio-to-Zelio linking in some configs.
- SR3NET01BD → Ethernet / Modbus TCP Communication Module (or earlier “Twido / Zelio NET” module — depending on generation; SR3NET01 = Ethernet expansion for SR3B… smart relays to allow Modbus TCP or SoMachine/Unity access via Ethernet).
- SR3B262BD → Zelio Logic Smart Relay (SR3 series) base unit — 12 DI / 8 DO (relay), with clock, display, and expandable with SR3MBU01BD or SR3NET01BD. “BD” = screw terminals.
- SR3XT61B / SR3XT61BD / SR3XT61FU → Expansion I/O modules for Zelio Logic SR3 base units:
- SR3XT61B → 4 DI + 2 DO (transistor or relay — check suffix: often 4×DI 24V DC + 2×Relay NO or Transistor OUT)
- SR3XT61BD → Same as SR3XT61B but screw terminals (D = screw; F = spring = FU suffix)
- SR3XT61FU → Same I/O but spring-cage terminals (FU = Federzug / spring)
Zelio Logic is used for small machine control, lighting management, pump control — where a full-size PLC is overkill but ladder logic + timer/counter + Modbus comms are needed.
Key Features
- Base Units (SR3B…): 10–26 I/O built-in, LCD display (on SR3B), real-time clock, ladder (Zelio Soft) or FBD programming.
- Modbus Module (SR3MBU01BD): RS-485 (2-wire), up to 19200 bps typical, acts as Modbus slave — maps Zelio %MW memory to Modbus registers.
- Ethernet Module (SR3NET01BD): Adds 10/100 Mbps Ethernet — Modbus TCP server; web server on some fw ver.
- Expansion (SR3XT61x): Up to 3 expansion modules per base — increases total I/O count.
- Programming: Via mini-USB (on Smart version) or PC with Zelio Soft (free) — Win XP–Win10/11 compatible.
- Country of Origin: France / Italy (Schneider Global)
Model Reference Table
Model | Type | Key Feature | Terminals | For |
|---|---|---|---|---|
SR3B262BD | Zelio Logic Smart Relay (Base) | 12 DI / 8 Relay DO, Clock, LCD (some var.), expandable | Screw (BD) | Standalone control or w/ modules |
SR3MBU01BD | Modbus RS-485 Comm. Module | Adds Modbus RTU Slave (RS-485 2-wire) to SR3/SR2 | Screw (BD) | Link to PLC/HMI/SCADA |
SR3NET01BD | Ethernet / Modbus TCP Module | Adds Ethernet (Modbus TCP, Web) to SR3B smart relays | Screw (BD) | Remote access / Modbus TCP master |
SR3XT61B / BD | Digital Expansion I/O | 4 DI + 2 DO (type per full code — often relay or transistor) | Screw (BD) / Spring (FU) | Expand SR3 base I/O count |
SR3XT61FU | Digital Expansion I/O (Spring) | Same as SR3XT61B — spring-cage terminals | Spring (FU) | Easier wiring in vibration areas |
💡 Compatibility Notes:
Technical Specifications (Representative — SR3MBU01BD Modbus Module + SR3B262BD Base)
Parameter | Specification (SR3MBU01BD) | Specification (SR3B262BD Base) |
|---|---|---|
Model / Order Code | SR3MBU01BD (Zelio Logic Modbus RS-485 Module) | SR3B262BD (Zelio Logic SR3 Smart Relay) |
Function | Modbus RTU Slave via RS-485 (2-wire: A/B/GND) | Compact PLC / Smart Relay — 12 DI 24V DC + 8 Relay OUT |
Communication (Comm. Mod.) | RS-485 half-duplex, Modbus RTU, up to 19200 bps (some 38400) | — (base has mini-USB for prog.; add SR3MBU01BD/SR3NET01BD for fieldbus) |
I/O (Base) | N/A (add-on) | 12 × DI (24V DC, sink/source), 8 × Relay OUT (NO — 250V AC / 5A resistive) |
Real-Time Clock | Via base | Yes (battery-backed — coin cell on board) |
Programming Software | Zelio Soft (free — defines Modbus register mapping %MW ↔ Holding Reg) | Zelio Soft — Ladder (up to 120 rungs) or FBD |
Expansion Capability | Occupies 1 of 3 expansion slots on SR3 base | Accepts up to 3 modules (I/O exp + 1 comm. module) |
Power Supply (Base) | 100–240 V AC or 24 V DC — depends on base suffix (SR3B262BD = 100–240V AC) | Same |
Mounting | DIN rail (35 mm) — clips onto SR3 base side | DIN rail (35 mm) — left-most in stack |
Dimensions (Base + Module) | Base: 71.5 mm × 90 mm × 70 mm + Module adds ~17.5 mm width | Same base |
Weight | ~ 0.06 kg (module); ~ 0.25 kg (base) | ~ 0.25 kg |
Standards | CE, UL 508, CSA C22.2 No.14, RoHS | Same |
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty (I/O & comms loopback test)
- Technical support for:
- Zelio Soft project creation & Modbus register mapping (%MW → Holding Register)
- SR3MBU01BD RS-485 wiring (A/B polarity, GND reference, 120 Ω termination if end node)
- Expansion module recognition (ensure base firmware supports expansion — SR3B… smart version required)
- Cross-reference older SR2… compatibility (SR2 has limited/no expansion on most)
- Starter cable (SR2USB01 / mini-USB) availability check
Delivery Time
- Standard delivery: 3-5 working days (stock items)
- Express shipping available upon request
Why Choose Our Store
- Genuine Schneider Electric Zelio Logic components — not third-party “compatible” smart relays
- Global supply network with competitive pricing
- Expertise in Zelio Soft programming, Modbus mapping & SR3 expansion configuration
- Comprehensive technical documentation (Modbus register table, expansion stacking diagram, Zelio Soft quick-start)
- Responsive customer service and support
Applications
- Small Machine Control: Conveyor start/stop, pump alternation, lighting sequences — programmed in ladder/FBD.
- Building Automation: Lighting zone control with time schedules (RTC) — linked to BMS via SR3MBU01BD Modbus.
- Retrofit of Relay Logic: Replace banks of timers/relays with programmable Zelio + keep existing field wiring (screw/spring terminals).
- Remote Monitoring: Add SR3NET01BD (Ethernet) for Modbus TCP access from SCADA or HMI.
- OEM Panels: Compact footprint — fits in small enclosures; display (on SR3B) allows local diag without laptop.
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