Siemens 6ED1055-1NB10-0BA2 / Siemens 6ED1055-1CB10-0BA2 are LOGO! 8 digital expansion modules with eight 24 V DC inputs and eight outputs for extending a compatible LOGO! controller. The DM16 24R ends the control path at relay contacts, whereas the DM16 24 uses sourcing transistor outputs for 24 V DC loads.
On Siemens 6ED1055-1NB10-0BA2 / Siemens 6ED1055-1CB10-0BA2, the input terminal groups condition field states before the expansion interface presents them to the LOGO! program. Output decisions travel back through the same interface, but the final hardware path differs: the 24R energizes a relay coil and switches an isolated contact, while the 24 version drives the load from its electronic output supply and return path.
Selection of Siemens 6ED1055-1NB10-0BA2 / Siemens 6ED1055-1CB10-0BA2 is therefore governed by the connected load circuit rather than channel count. The relay version can separate its contacts from an AC or DC load supply; the transistor version requires correct DC polarity, a shared return arrangement and a load within the electronic channel limit.









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