Features:
- Four DC input points extend the connected LOGO! controller's field-state capacity.
- Four relay contacts switch resistive or inductive loads within their separate documented limits.
- The two-unit housing mounts directly on a 35 mm DIN rail.
Siemens 6ED1055-1MB00-0BA1 expands both the input and output sides of a LOGO! arrangement in one compact module.
The input circuits share the module's 12/24 V DC supply class, while the output section uses relay contacts rather than transistor outputs.
External fusing must remain part of the load circuit because the relay outputs do not include short-circuit protection.
The Siemens 6ED1055-1MB00-0BA1 LOGO! DM8 12/24R Digital Expansion Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ED1055-1MB00-0BA1 LOGO! DM8 12/24R Digital Expansion Module Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Tracing signals through the expansion module
- Input Side: Four DC field states enter the expansion module as separate digital inputs.
- Module Bus: The LOGO! base module reads those expansion points through the internal module connection.
- Output Side: Four commands operate isolated relay contacts rather than DC transistor channels.
- Load Circuit: Each field load remains part of its own externally protected relay circuit.
Matching the contact path to the connected load
- Resistive Loads: Resistive circuits use the higher documented contact-current limit.
- Inductive Loads: Coils and other inductive loads use the lower contact-current boundary.
- External Fuse: The field circuit must provide protection because the relay output is not short-circuit protected.
- Relay Identity: The R suffix distinguishes this output hardware from transistor-output LOGO! expansion modules.
Placing the module in the LOGO! mounting row
- Rail Standard: The enclosure clips onto a 35 mm DIN rail.
- Row Width: Two spacing units must be available beside the connected LOGO! device.
- Front Access: Input and relay terminals remain accessible from the front of the mounted module.
- Enclosure Limit: IP20 protection requires the surrounding panel to provide the needed environmental barrier.
Reading the documented compliance coverage
- North American Marks: CSA, UL, and FM approvals are listed for this module.
- Control Standard: Development is identified with IEC 61131.
- VDE Reference: The product data also cites VDE 0631.
- Marine Use: Marine approval is included in the documented approval set.