What you're ordering
This is the Siemens 6ED1052-2FB00-0BA8 LOGO! 230RCEO — a logic module with integrated power supply and I/O running on 230 VAC/DC. It gives you 8 digital inputs and 4 relay outputs (10 A resistive, 3 A inductive) in a compact 4 spacing-unit housing that clips onto 35 mm DIN rail. There's no display, but you get built-in Ethernet, a web server, data logging, and a microSD slot for program storage. Memory supports 400 blocks, and the module is expandable with additional LOGO! modules. Rated for 0 °C to 55 °C operating ambient; LOGO! 8 FS04 and higher extends the low end to -20 °C. Approvals include CE, UL, CSA, FM, Marine, and EN55011 Limit Class B.
How it compares to the display version (6ED1052-1FB00-0BA7)
The most common alternative is the 6ED1052-1FB00-0BA7, which has a built-in display and is 6 spacing units wide (107 mm) vs this one at 4 spacing units (71.5 mm). Electrically they're identical: same 230V supply, same 8 DI / 4 DO relay outputs, same inductive/resistive loads. The display version holds 333 blocks vs 400 blocks here — minor difference. If your panel was laid out for the 107 mm version, this one will fit but leave a 35 mm gap on the DIN rail; you may want a filler piece or spacer. If you don't need the display for local diagnostics, the compact version saves panel space and is a direct functional drop-in for wiring.
What the temperature ratings mean for your install
The module is rated for 0 °C to 55 °C operating ambient. If you're using a LOGO! 8 FS04 firmware or higher, the lower limit drops to -20 °C — useful for unheated areas or cold storage. The 55 °C max is typical for control cabinets; if your cabinet runs hotter, you may need forced ventilation or a higher-rated device. This module does not include short-circuit protection on outputs — you must add external fusing as noted in the documentation.
Compliance at a glance
Carries CE, cULus, CSA, FM, and Marine approvals. Limit class B for use in residential areas.