Description:
The Siemens 6ED1055-1MB00-0BA1 is a digital I/O expansion module branded as LOGO! DM8 12/24R, produced by Siemens AG under the LOGO! 8 (0BA8) micro-logic controller family. Classified as a plug-on expansion module, it adds 4 digital inputs (12/24 V DC) and 4 relay outputs (5 A resistive / 3 A inductive) to a LOGO! 8 base unit, mounting directly to the right-hand side of the host with automatic internal-bus recognition — no ribbon cables, no separate 24 V feed, no addressing dip-switches.
Application Scenarios:
A small municipal sewage lift station in Bavaria runs three duty/standby submersible pumps controlled by a LOGO! 8 base unit (6ED1052-…) that originally handled only 8 DI / 4 DO — enough for float switches, hand-off-auto selectors, and pump contactors, but tight. When the municipality added a storm-water overflow gate and a local high-level alarm beacon, the I/O budget ran dry. Rather than upsizing to a full S7-1200 rack (which would have meant a new panel, new wiring, and a TIA Portal rewrite), the integrator snapped a Siemens 6ED1055-1MB00-0BA1 onto the LOGO! host’s right side — 2 TE wider, same DIN row, internal bus auto-enumerated on power-up. The four new DI picked up the overflow gate limit switches and a remote HOA; the four relay outputs drove the gate actuator contactor, the alarm beacon, and two spare loops for future sump heaters. Total on-site time: 45 minutes including wiring the 8 new field terminals. For OEMs building compact machines — car-wash sequences, small conveyor interlocks, HVAC damper banks, door/gate controls, fish-farm aerator timers — the Siemens 6ED1055-1MB00-0BA1 is the difference between “fits in the existing enclosure” and “we need a bigger cabinet.”
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | Siemens 6ED1055-1MB00-0BA1 |
| Manufacturer | Siemens AG (LOGO! 8 family, 0BA8) |
| Product Category | Digital I/O Expansion Module (DM8 12/24R) |
| Digital Inputs | 4 × DC 12/24 V (10.8–28.8 V range; “0” ≤ 5 V, “1” ≥ 8.5 V; typ. 1.5 mA @ “1”) |
| Input Delay | ≤ 1.5 ms (“0″→”1” and “1”→”0″ at rated voltage) |
| Digital Outputs | 4 × relay, NO contact |
| Output Current (resistive) | 5 A max per channel (lighting load ≤ 1000 W) |
| Output Current (inductive) | 3 A max (cos φ = 0.4, e.g. contactor coils, solenoids) |
| Switching Frequency | 2 Hz (resistive), 0.5 Hz (inductive), 10 Hz mechanical |
| Supply / Backplane | Powered from LOGO! host via internal bus; field side 12/24 V DC |
| Mounting | 35 mm DIN rail, 2 TE width (36 mm), snap-on right of LOGO! 8 base |
| Dimensions (W×H×D) | 36 × 90 × 55 mm |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | –40 °C to +70 °C |
| Ingress Protection | IP20 (control-cabinet) |
| EMC / Standards | EN 55011 Class B (residential), IEC 61131, VDE 0631, CE / UL / cULus / CSA / FM |
| Weight | ~0.169 kg |
Technical Principles and Innovative Values:
- Innovation Point 1: Zero-cable internal bus expansion. The Siemens 6ED1055-1MB00-0BA1 clips mechanically and electrically onto the right-hand data connector of a LOGO! 8 base unit — power, I/O image, and diagnostics all flow across the molded bus bar without a single jumper wire. Compared with S7-200/300 SM expansion (ribbon or Profibus cable, separate power), this cuts panel build time by ~30% on small machines.
- Innovation Point 2: 12/24 V DC input with 10.8–28.8 V tolerance. The Siemens 6ED1055-1MB00-0BA1 accepts both 12 V battery-sourced panels (solar pump stations, mobile machines) and 24 V industrial supplies, making one BOM cover both stationary and semi-mobile OEM skids — a flexibility pure-24 V modules don’t offer.
- Innovation Point 3: 5 A relay direct-drive per channel. Most micro-PLC expansion tops out at 2 A transistor; the Siemens 6ED1055-1MB00-0BA1‘s 5 A relay contacts can pick up a 3 A contactor coil, a solenoid, or a small beacon straight from the terminal — no interposing relay, no panel-space penalty. At 1000 W lighting load rating, it also handles cabin/flood light groups directly.
- Innovation Point 4: EN 55011 Class B residential rating. The Siemens 6ED1055-1MB00-0BA1 is certified for living-area EMC, meaning it’s legal in building-side panels (HVAC plant rooms, small wastewater kiosks, door-control cabinets) without extra suppression — a detail that matters for OEMs selling into municipal or residential projects.
