It supports all the "standard" Discrete and Analog I/O.
However, Do-more does not support the following specialty modules:
CTRIF (the slot 0 module, not CTRIO/2 which are supported by Do-more), DCM, RMSM, and Basic CoPro modules, along with the EM/CM base expansion "modules".
The H2-SERIO/4 is one that is NOT supported by 260 but IS supported by Do-more.
All the other specialty modules are supported (ERM, ECOM, ECOM100, CTRIO, CTRIO2, etc.).