The rule in one paragraph
Siemens LOGO! digital expansion modules exist in generation-specific versions, and the version suffix at the end of the ordering number decides which base generation they attach to: references ending in 0BA2 belong to the LOGO! 8 generation, while references ending in 0BA3 belong to the LOGO! 9 generation. The most common ordering mistake in this family is buying the right module type (DM8) with the wrong generation suffix — it matches the catalogue description but not your base module. Check the suffix on your base module's label before anything else.
The DM8 12/24R (0BA3) — official parameters
The 6ED1055-1MB00-0BA3 is the LOGO! DM8 12/24R digital expansion module for the LOGO! 9 generation. Its published parameters: supply 12/24 V DC; 4 digital inputs at 12/24 V DC; 4 relay outputs with a 5 A maximum; mounting on a 35 mm DIN rail in 2 module widths; IP20; operating temperature -20 to +55 °C without condensation; compatibility with LOGO! 9 base modules only. It is not a standalone controller — it extends a LOGO! 9 base module with additional I/O.
Generation matching: 0BA2 vs 0BA3
If your base module is a LOGO! 8 generation unit, the corresponding expansion is the 0BA2-version DM8; if it is a LOGO! 9 base module, order the 0BA3 version (such as the 6ED1055-1MB00-0BA3). The official Siemens product documentation for each version states its target generation. The number of expansion modules a LOGO! base can take is set by the base module, not by the DM8 itself — confirm the supported expansion count in your base module's manual before ordering several units.
Other LOGO! 9 parts that are ordered separately
The LOGO! 9 periphery splits into separately ordered items, and knowing this prevents double orders: the TDE text display, its mounting accessory set (the 6ED1057-1DA00-0BA3, which contains one 3-pole plug and two mounting clips — it is a spare-parts set, not the display itself), the LOGO! Soft Comfort V9 programming software (the 6ED1058-0BA08-0YA3, a single licence for 1 installation with 6 interface languages), and the base modules themselves. If your TDE display is installed and you lost its plug or clips, the accessory set is the spare part; if you have no TDE display at all, the set alone is not enough.
What to confirm before ordering
Confirm: your base module's generation from its label (0BA2-era LOGO! 8 or 0BA3-era LOGO! 9); the supply voltage of your cabinet (12 V DC vs 24 V DC — the DM8 12/24R accepts both, other variants do not); the output style (relay 5 A for mixed loads, DC variants for faster switching); and the expansion count your base module supports. We verify the complete reference free of charge from a label photo via the RFQ form.
What JWDrive can supply
LOGO! 9 components are listed in the JWDrive online shop with fixed USDC/USDT prices — including the DM8 12/24R expansion (6ED1055-1MB00-0BA3), the TDE accessory set (6ED1057-1DA00-0BA3) and Soft Comfort V9 (6ED1058-0BA08-0YA3) — each with dispatch within 2 business days after payment confirmation and a 12-month warranty. LOGO! 8 generation references are quoted on request.
Frequently Asked Questions
Can I attach a 0BA3 DM8 to a LOGO! 8 base module?
The versions are generation-specific: the 0BA3 version is documented for LOGO! 9 base modules, and the LOGO! 8 generation uses the 0BA2 version. Check the suffix on your base module and match it — if unsure, send us a photo of the label and we will confirm before you order.
What is the difference between the DM8 12/24R and other DM8 variants?
The 12/24R designation means a 12/24 V DC supply with relay outputs (4 DO, 5 A maximum per the official data). Other DM8 variants use DC transistor outputs instead of relays. Match the output style to your load: relays for mixed or mains-side loads, transistor variants for fast DC switching.
Does the DM8 need its own programming?
No separate program is written for the DM8 — the expansion's I/O becomes part of the LOGO! program running on the base module. The wiring, supply matching and generation fit are the engineering checks; the program change happens in LOGO! Soft Comfort on the base module.
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