Siemens 6ED1055-1MB00-0BA1 LOGO! AM2 Analog Input Expansion Module, 0BA1

Product Overview

The 6ED1055-1MB00-0BA1 is a Siemens LOGO! AM2 analog input expansion module, belonging to the LOGO! 0BA1 generation — the first widely adopted commercial release of Siemens’ “logic module” line that bridged the gap between relay wiring and a full SIMATIC S7-200/S7-1200. Where the LOGO! base unit (e.g. 6ED1052-1… 0BA1 host) gives you digital inputs/outputs and a small relay-driver logic engine, the 6ED1055-1MB00-0BA1 extends that base with two analog input channels, configurable for 0–10 V or 0/4–20 mA, letting a LOGO! 0BA1 node read a level transmitter, a temperature sensor via 4–20 mA, or a 0–10 V potentiometer/solar-lux probe without jumping to a full PLC.Physically, the 6ED1055-1MB00-0BA1 snaps onto the right-hand side of a LOGO! 0BA1 base module via the LOGO! proprietary expansion header — no backplane rack, no DIN-rail break, just a 36 mm wide module that draws its low-voltage logic from the host and presents screw terminals for the two analog loops. Resolution is 10-bit (typical for AM2 on 0BA1), conversion time per channel in the low milliseconds, and the module inherits the host’s 24 V DC or 230 V AC supply context depending on which 0BA1 base you’ve paired it with (the AM2 itself is low-voltage logic, but the host determines whether the overall node is 24 V DC or 115/230 V AC relay-rated).In the automation hierarchy, the 6ED1055-1MB00-0BA1 sits at the small-machine edge: pump-skids, HVAC dampers, lighting-control panels, small conveyor zones, greenhouse climate loops, domestic-water pressure sets, and workshop compressor controls — anywhere a maintenance electrician would otherwise wire 8 relays and a timer, but the process actually needs “if pressure > 6 bar and tank level > 30%, run pump 2 with a soft-start delay.” The LOGO! 0BA1 base + 6ED1055-1MB00-0BA1 combo delivers that for a fraction of a S7-1200 + analog-card BOM. The 0BA1 generation is long obsolete (succeeded by 0BA2 → 0BA3 → … → 0BA8 / LOGO! 8, and now LOGO! 12/24 RCE / 24CE generations), so the 6ED1055-1MB00-0BA1 now trades in the secondary/spare market for plants and panels that were built in the late 1990s–early 2000s and never re-engineered.One practical note: the 6ED1055-1MB00-0BA1 (0BA1 suffix) is not forward-compatible with LOGO! 0BA2→0BA8 bases without checking — later AM2 revisions (same 6ED1055-1M… article but different suffix, e.g. -0BA2, -0BA3…) track the LOGO! generation. Mixing an 0BA1 AM2 onto a 0BA3 host usually works electrically but the LOGO! Soft Com/Soft comfort programming tool may warn; conversely, a later-AM2 on an 0BA1 host can have EEPROM/config mismatches. If you’re buying spares, match the suffix to the host’s 0BA generation — that’s the mistake most purchasers make.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	6ED1055-1MB00-0BA1
Manufacturer	Siemens AG
Product Type	Analog Input Expansion Module for LOGO! (AM2)
LOGO! Generation	0BA1 (first commercial LOGO! generation)
Number of Channels	2 analog inputs
Input Signal Range	0–10 V DC / 0–20 mA / 4–20 mA (software-selectable per channel via host config)
Resolution	10 bit (typical for AM2 on 0BA1)
Conversion Time	< 5 ms per channel (typical)
Connection to Host	LOGO! expansion header (right-side snap-on, no cables)
Supply Voltage (Logic)	Via LOGO! base module (derived from host 24 V DC internal rail)
Power Consumption	< 1 W (from host)
Terminals	Screw terminals for 2 × analog loops
Mounting	35 mm DIN rail, snapped to right of LOGO! 0BA1 base
Width	36 mm
Operating Temperature	0 °C to +55 °C
Storage Temperature	-40 °C to +70 °C
Relative Humidity	≤ 95 % (non-condensing)
Protection Rating	IP20 (cabinet internal)
Certification	CE, UL, CSA (per original 0BA1 release)

📌 Compatibility note: The 6ED1055-1MB00-0BA1 (-0BA1 suffix) is intended for LOGO! 0BA1 base units (e.g. 6ED1052-1MD00-0BA1, 6ED1052-1CC00-0BA1, etc.). It will physically snap onto later 0BA2/0BA3 bases but may throw a generation-mismatch warning in LOGO! Soft Com; conversely, a -0BA2 or -0BA3 AM2 on an 0BA1 host can have config EEPROM issues. Match suffix to host for zero-fuss.

Main Features and Advantages

Two analog channels on a 36 mm slice. The biggest value of the 6ED1055-1MB00-0BA1 is that it gives a LOGO! 0BA1 node analog eyes without forcing you into a S7-200 + EM 235 or a S7-1200 + SM 1231 — both of which multiply BOM cost and panel space. On a pump-skid where you need “run pump if tank level > 30% AND discharge pressure < 8 bar,” the level transmitter lands on one channel (4–20 mA) and a pressure transducer on the other (0–10 V or 4–20 mA), and the LOGO! ladder/factor-block logic handles the rest. That’s a panel that used to need a relay bank + separate pressure switch + separate level switch, now condensed into a LOGO! base + 6ED1055-1MB00-0BA1.Voltage/current dual mode per channel. Each of the two channels on the 6ED1055-1MB00-0BA1 is jumperless-software-configured through the LOGO! host: 0–10 V for potentiometers, lux probes, or 0–10 V transducer outputs; 0/4–20 mA for standard two-wire transmitters. No DIP switches on the AM2 itself — the host pushes config down the expansion header at boot. That means a spare 6ED1055-1MB00-0BA1 on the shelf works for either signal type; the commissioning laptop decides which. For panels built in the 0BA1 era, this was a notable step up from the “one card = one signal type” norm of late-90s small PLCs.Snap-on expansion, no wiring between modules. The 6ED1055-1MB00-0BA1 connects to the LOGO! base through the molded expansion header — no flat-cable, no separate 24 V daisy chain, no address dip-switches. The host auto-detects the AM2 at boot and maps the two AI values into the LOGO! internal register space (typically AI 3 and AI 4 if the base already has onboard AI 1–2, or AI 1–2 if the base is pure-digital). For a maintenance tech who’s never touched a PLC, “snap it on, power up, the logo sees it” is a low-friction story — and that’s exactly who the LOGO! line was aimed at.0BA1 ecosystem fit. The 6ED1055-1MB00-0BA1 belongs to the generation where LOGO! first went mainstream — 24 V DC and 230 V AC relay-base variants, LCD programmable on the higher trims, and the AM2 as the analog companion. If your panel has a 0BA1 host with the old-school LOGO! block diagram on the door, the 6ED1055-1MB00-0BA1 is the analog module that belongs next to it. Later LOGO! generations (0BA2 … 0BA8, LOGO! 8, LOGO! 12/24RCE) keep the AM2 concept alive but change the suffix and occasionally the header keying — so the -0BA1 remains a targeted spare for 0BA1 panels, not a “universal LOGO! analog card.”Obsolescence reality. The 0BA1 line is ~25+ years old. New 6ED1055-1MB00-0BA1 units from Siemens are long gone; what’s on the market is NOS (new old stock) or pulled-from-working panels. That’s fine — the 6ED1055-1MB00-0BA1 is passive analog frontend + header, no firmware to corrupt, no battery, no moving parts. A 1999-vintage AM2 works the same in 2026 if the screw terminals haven’t been over-torqued. For plants sitting on 0BA1 LOGO! panels (“if it breaks we’ll deal with it”), one or two cold-spare 6ED1055-1MB00-0BA1 modules per site is the lowest-cost continuity play short of a full panel rework to LOGO! 8 or S7-1200.