SIEMENS 6ED1055-1FB00-0BA2 LOGO! Digital Expansion Module 4DI/4DO 24VDC | Replacement, Equivalent & Selection Guide
The Siemens 6ED1055-1FB00-0BA2 is a digital expansion module for the LOGO! logic module series, providing 4 digital inputs and 4 digital transistor outputs at 24 V DC. It extends the I/O capacity of LOGO! base units for small-scale automation tasks in building technology, machinery, and process control. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams sourcing this module or its equivalents.
Technical Specifications
- Part Number: 6ED1055-1FB00-0BA2
- Series: LOGO! Expansion Module (DM8 24)
- Manufacturer: Siemens AG
- Supply Voltage: 24 V DC
- Digital Inputs: 4 × 24 V DC
- Digital Outputs: 4 × transistor (solid-state), 0.3 A per output
- Total I/O: 8 points (4DI + 4DO)
- Connection Method: Screw terminal
- Mounting: DIN rail (35 mm)
- Dimensions (W×H×D): 36 × 90 × 55 mm
- Weight: approx. 230 g
- Protection Rating: IP20
- Operating Temperature: 0 °C to +55 °C
- Storage Temperature: −40 °C to +70 °C
- Certifications: CE, UL, cULus, ATEX (Zone 2)
- Compatible Base Units: LOGO! 0BA7, 0BA8 series
Compatible Replacement & Equivalent Models
The table below lists direct replacements and functional equivalents for the 6ED1055-1FB00-0BA2. Always verify supply voltage, output type, and LOGO! generation compatibility before substituting.
- 6ED1055-1FB00-0BA1 — Previous hardware revision (0BA1); functionally identical, compatible with 0BA7 base units. Direct drop-in replacement for older installations.
- 6ED1055-1FB10-0BA2 — DM8 24R variant with relay outputs (2 A); use when load switching or AC output capability is required instead of transistor outputs.
- 6ED1055-1MD00-0BA2 — DM16 24 module offering 8DI + 8DO; suitable when additional I/O points are needed without adding a second expansion slot.
- 6ED1055-1NB10-0BA2 — DM8 230R module for 115/230 V AC applications; select when the field devices operate on AC voltage.
- 6ED1055-1CB00-0BA2 — AM2 analog expansion module (2AI); not a direct replacement but used alongside digital modules when analog sensing is required.
Why Choose the Original Model
- Guaranteed compatibility: Factory-matched to LOGO! 0BA7/0BA8 firmware and bus interface — no configuration workarounds needed.
- Transistor outputs for fast switching: Solid-state outputs support high-cycle applications (conveyors, solenoids, indicator lamps) without contact wear.
- Compact 36 mm width: Minimizes panel space; up to 3 expansion modules can be chained to a single LOGO! base unit.
- Siemens global support: Full documentation, spare parts, and TIA Portal / LOGO! Soft Comfort software support available worldwide.
- ATEX Zone 2 rating: Suitable for use in potentially explosive atmospheres, expanding deployment options beyond standard industrial environments.
Typical Applications
- Building automation: lighting control, HVAC switching, access control interlocks
- Machine control: conveyor sequencing, motor starter logic, safety interlocks
- Pump and compressor control in water treatment and HVAC plants
- Greenhouse and agricultural automation (irrigation, ventilation)
- Small OEM equipment requiring compact, cost-effective PLC expansion
System Compatibility
- Compatible base units: LOGO! 12/24RC (6ED1052-1MD00-0BA8), LOGO! 24 (6ED1052-1CC01-0BA8), LOGO! 24RCE (6ED1052-1HB00-0BA8), and all 0BA7-generation equivalents
- Programming software: LOGO! Soft Comfort V8.x; no additional driver required for expansion modules
- Maximum expansion chain: Up to 3 digital or analog expansion modules per base unit (subject to power budget)
- Bus interface: Proprietary LOGO! expansion bus — not compatible with S7-1200 or S7-300 I/O modules
- Power supply: Powered via expansion bus from base unit; no separate 24 V supply required for the module itself
Selection Guide
Use the following decision criteria to select the correct expansion module:
- Output type needed? → Transistor (fast switching, DC loads): 6ED1055-1FB00-0BA2 ✓ | Relay (AC/DC, higher current): choose 6ED1055-1FB10-0BA2
- Supply voltage? → 24 V DC: 6ED1055-1FB00-0BA2 ✓ | 115/230 V AC: choose 6ED1055-1NB10-0BA2
- I/O count needed? → 4DI + 4DO: 6ED1055-1FB00-0BA2 ✓ | 8DI + 8DO: choose 6ED1055-1MD00-0BA2
- LOGO! generation? → 0BA8 (current): 6ED1055-1FB00-0BA2 ✓ | 0BA7 (legacy): 6ED1055-1FB00-0BA1 also compatible
- Analog signals required? → Add 6ED1055-1CB00-0BA2 (AM2) alongside this module
Quality Assurance & Sourcing
- All units sourced from authorized Siemens distribution channels or verified surplus with full traceability documentation.
- Each module undergoes incoming inspection: visual check, label verification, and functional power-on test before dispatch.
- Original factory packaging and holographic labels preserved where available.
- Counterfeit risk mitigation: serial numbers verified against Siemens product authenticity database upon request.
- Lead time: in-stock units ship within 1–3 business days; special orders within 7–14 business days.
How to Order
- Part Number: 6ED1055-1FB00-0BA2
- Quantity: Single unit or bulk — contact us for volume pricing.
- Online: Add to cart directly on this page.
- Email: support@konmask.com with your PO or inquiry.
- Phone / WhatsApp: +0086 19859288691
- Lead Time: 1–3 business days (in stock); 7–14 business days (special order)
- Shipping: DHL / FedEx / UPS international express; sea freight available for bulk orders.
Replacement & Compatibility FAQ
Q: Can I use 6ED1055-1FB00-0BA2 with a LOGO! 0BA6 base unit?
A: No. The 0BA2 hardware revision is designed for 0BA7 and 0BA8 generation base units. For 0BA6, use the 6ED1055-1FB00-0BA0 or 0BA1 revision.
Q: Is the 6ED1055-1FB00-0BA2 a direct replacement for 6ED1055-1FB00-0BA1?
A: Yes, the 0BA2 revision is backward-compatible and can replace 0BA1 in existing 0BA7 installations without reprogramming.
Q: Can I mix digital and analog expansion modules on the same LOGO! base unit?
A: Yes, up to 3 expansion modules (digital or analog) can be chained, subject to the base unit’s power budget.
Q: What is the maximum output current per channel?
A: 0.3 A per transistor output channel, with a total module output current of 1.2 A.
Q: Does this module require separate 24 V DC power?
A: No. It draws power directly from the LOGO! expansion bus connector on the base unit.
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